51 results about "Wave-making resistance" patented technology

The present invention discloses a front water diversion propulsion ship and aims at providing a regular water diversion type ship which can eliminate wave making completely or reduce the wave making and eliminate wave making resistance and can also reduce the friction resistance and motivate the hydrodynamic propulsion to improve the comprehensive performance of the ship such as speed, stability and efficiency. The front water diversion propulsion ship is realized by a technical proposal as follows: a forward water inlet is arranged under the water line at the front part of the ship; and a backward water outlet or a thruster inlet are arranged and matched at the forward water inlet with a flow passage which runs through the forward water inlet and a stern or arranged at two lateral parts. Or a forward-backward thruster is arranged under the water line, or a watercourse is matched and arranged in the front of the water line, two lateral water outlets which are propelled by two sides of the front of the ship or propelled by a stern impeller are arranged, or the back ship body of the thruster is arranged as a streamline after run to motivate the hydrodynamic propulsion. The technology of the front water diversion propulsion ship can fit for designing and manufacturing a powered regular drainage ship and improving the existing ship and is especially fit for designing, manufacturing and improving the economical, large and jumbo ships.

The invention provides a high-speed catamaran which comprises two sheet bodies arranged in parallel and a main cabin connected onto the tops of the sheet bodies. The high-speed catamaran further comprises two bulbnoses, an air suction device and a plurality of micro-bubble generating devices, wherein the two bulbnoses are connected to the bottom of the main cabin through struts and are vertically arranged on a bow and a stern of the catamaran, the air suction device is mounted on the top of the main cabin and is communicated with air pipes arranged inside the high-speed catamaran in a built-in mode, and the plurality of micro-bubble generating devices are arranged on the surfaces of the bulbnoses and the sheet bodies and is communicated with the air pipes. Hydrofoils are symmetrically arranged on both sides of each of the bulbnoses. The seakeeping performance of the catamaran is enhanced by arranging the bulbnoses with the hydrofoils on the bow and the stern to reduce wave-making resistance. The micro-bubble generating devices arranged at the bottom of the catamaran can generate thin bubble films at the bottom of the catamaran to reduce the frictional resistance of the catamaran. The air suction device arranged on the top of the cabin and air suction rotors can further improve the air suction efficiency of the air suction device, enhance the resistance reduction effect of the micro-bubble generating devices, and greatly reduce the energy consumption for generating micro bubbles.

A dolabriform bow high-speed boat model adhered with wave-elimination-damping wings comprises a dolabriform bow, wherein two symmetrically distributed wave-elimination-damping wings are installed below waterlines on two sides of the dolabriform bow. When a boat sails on the peaceful sea surface or in small storm waves, the wave-elimination-damping wings have a wave-elimination effect, and a lifting force is generated on the wave-elimination-damping wings to raise a boat body, reduce contact area of the boat body and water and reduce friction resistance. Simultaneously, waves generated by the wave-elimination-damping wings and boat-shaped waves can mutually generate favorable interference to reduce wave-making resistance. Effects of the two aspects enable traveling resistance of the boat to be remarkably reduced. When the boat sails in large storm waves, the wave-elimination-damping wings have a damping effect on vertical motion of the boat in waves, so that the boat with the dolabriform bow can have small vertical accelerated speed and small vertical motion amplitude, and seakeeping performance of the dolabriform bow boat model is further improved.

The invention discloses a novel ship bow which is provided with a designed waterline and a base line. The longitudinal length of the portion, located below the base line, of the ship bow is a and a is larger than 0.2 m. The maximum perpendicular distance of the portion, located below the base line, of the ship bow is b and b is larger than 0. The ship bow comprises an upper deck. The length of the upper deck is smaller than that of the designed waterline. The volume of displacement on the portion of the ship bow is increased, so that the volume of displacement is evenly distributed in the length direction of a ship, the whole designed waterline is made to be thin, and wave-making resistance is reduced in navigation.

The invention discloses a three-dimensional digital ship model virtual resistance test method and system, and belongs to the field of surface ship resistance performance experiments. The method comprises the following steps of (1) establishing digital ship models and flow field calculation domains where the digital ship models are located; (2) arranging full-structured hexahedral grids in the flowfield calculation domains around the digital ship models, and discretizing the flow field calculation domains; (3) setting boundary conditions, dividing the hexahedral grids to simulate the free surface movement and the non-free surface movement of the digital ship models, and respectively measuring a wave-making resistance coefficient and a viscous resistance coefficient of the digital ship models; (4) obtaining a total resistance coefficient of the ship and flow field information in the flow field calculation domains through the wave-making resistance coefficient and the viscous resistancecoefficient; and (5) carrying out fluid power analysis on the flow field information to obtain a ship free surface wave height distribution curve and a ship free surface wave-making distribution clouddiagram. The method and the system provided by the invention can provide reliable water power data and flow field information for the design and optimization of the ship.

The invention discloses a mixed-flow device of a ship diversion propelling system, aiming at solving the problem of jet flow of the ship diversion propelling system. The mixed-flow device mainly consists of a jet pipe, a wake flow pipe and a mixed-flow pipe, wherein a nozzle of the jet pipe and an outlet of the wake flow pipe are communicated with the mixed-flow device; an inlet of the wake flow pipe is arranged at the lateral side of the jet pipe; the cross section of the jet pipe is less than that of the mixed-flow pipe; and jet flow and wake flow are acted and mixed together in a mixed-flow cavity. By comparing water flow at the outlet of the mixed-flow pipe with the water flow at the nozzle of the jet pipe, the invention reduces the speed and increases the flow so as to improve the stern flow field of the ship, reduce the wave making resistance of the stern, or improve the flow field of a propeller or a pump impeller, improve the propelling efficiency and reduce damage of vacuole and water attach. The induced velocity generated by the water flow at the outer side of the inlet of the wake flow pipe and the induced pressure converted thereby can be further used for improving the stern flow field of the ship and reducing the wave making resistance of the stern.

The invention relates to a 'rotating floating body boat', in particular to a displacement surface novel ship, belonging to the field of shipbuilding industry. The rotating floating body boat is formed by rotating floating bodies, a boat platform, boat side plates, a bow sealing plate and a stern sealing plate, and a power and propulsion device. The rotating floating bodies which do not sink, have buoyancy and rotate at high speed form the rotating floating body boat of any size with a single row, two rows, three rows and more rows of rotating floating bodies. The firm and integral boat platform is supported by rotating floating body shafts, bearings and bearing seats. The boat platform is higher than water surface. When the rotating floating body boat sails at high speed, waves are not generated and the wave making resistance is eliminated, the water friction resistance is greatly reduced, the boat speed is greatly improved, the goals of energy saving and emission reduction are reached, the boat does not sink and the safety is high, the boat can substitute for all kinds of ships in the prior art, and the boat is a novel product for ship update.

The invention provides a function conversion device for bottom air spraying of skimming boats, hovercraft and ground-effect wing ships. In order to achieve the goal, the function conversion device adopts the technical scheme that a plurality of air spraying openings capable of changing the air spraying direction are formed in the bottom of the skimming boats, the hovercraft or the ground-effect wing ships, and the airflow sprayed out from the air spraying openings is directionally sprayed out through an airflow steering plate. When the airflow is downwards sprayed out, the skimming boats, the hovercraft and the ground-effect wing ships realize the vertical ascending and descending; when the airflow is forwards or backwards sprayed out, the ships and the boats are driven to advance or retreat in an assisted way. Compared with the prior art, the function conversion device has the advantage that the skimming boats, the hovercraft or the ground-effect wing ships can directly ascend and descend from the water surface or the land. During the running on the water surface, the boat body is separated from the water through an air layer sprayed out from the boat bottom, the wave-making resistance is greatly reduced, and the friction resistance between the water and the boat body is eliminated. The ships and the boats are operated and controlled by an automatic control system, and the longitudinal balance and the transverse balance of the ships and the boats can be maintained by the respective independently acting airflow steering plates through regulating the air spraying angle in real time.

The invention provides a stem wave elimination device, which comprises a pipeline arranged in the stem and a propeller arranged in the pipeline. The device of the invention can efficiently reduce wave resistance, frictional resistance and differential pressure resistance. An impeller can generate electricity by utilizing the tail flow of the propeller so as to save energy. The device can improve a finished ship and has a function of reducing the wave-making resistance, frictional resistance and sticky pressure resistance.

The invention discloses a ship which can advance laterally and reduce the wave resistance. It includes ship body (1), the lateral position below the ship body (1) floating line is equipped with several tunnel (2) passing through the ship body (1), two ends of each tunnel (2) are equipped with propeller (3) respectively, the propeller (3) is connected with the drive device (K1) driving it work and the all-slewing equipment (K2) which can make the propeller (3) generate thrust towards any direction, it is also equipped with the lateral oscillating motion device(K3) which recalls and overhangs the propeller (3) into tunnel (2). The ship has simple structure, it can reduce the ship wave resistance effectively to pushing water navigation, as well as can make the propeller generate thrust towards any direction conveniently and recall or overhang the propeller into tunnel, it can effectively increase the cabin capacity of ship; it can realize turning conveniently and enhance the stability of ship course greatly.

The invention discloses a water-jet mixed-flow propulsion body of a ship, which is used to further optimize the structure and function of an external-mounted water-jet mixed-flow propulsion system, and further improve the propulsion power and propulsion efficiency. It mainly consists of a conduit and a sleeve. The conduit extends into the casing to form a flow mixer. The outlet part of the conduit is a jet tube, and the inlet part of the conduit is a bell mouth. The outer edge of the bell mouth is in contact with the outer surface of the casing. It is divided into two parts for the boundary, the outlet part of the casing is a mixed flow pipe, and the mixed flow pipe is connected with the follower channel, and the water inlet of the follower channel is on the outer surface of the casing. The bell mouth of the duct can not only reduce the hydraulic loss of the water-jet propulsion part, but also can separate and improve the inflow field of the water-jet propulsion part and the mixed-flow propulsion part, thereby reducing the wave-making resistance and improving the propulsion efficiency. The bend of the waker channel can promote the conversion of the negative pressure difference generated by the jet effect into propulsion, so the mixed flow propulsion part can recover a part of the injection power and convert it into propulsion power.

The invention provides a demihull-adjustable trimaran. The demihull-adjustable trimaran comprises a main hull and two demihulls. One side of each demihull is connected with one side of the main hull,the two demihulls can move in the hull direction of the main hull so as to change the positions of the demihulls relative to a hull of the main hull, and the two demihulls can rotate around the main hull so that the transverse width of the demihull-adjustable trimaran can be changed. The resistance influence of wave making interference between the main hull and the demihulls on the demihull-adjustable trimaran can be reduced, when the navigation speed is low, the demihulls are placed in the positions near the middle portion of the main hull, wave making resistance can be reduced, and influenceof heave and pitch motion can be reduced; when the navigation speed is high, the demihulls should be placed at a stern of the main hull; and the width of the demihull-adjustable trimaran is reduced to a great degree, the working range of the demihull-adjustable trimaran is enlarged, and especially, the demihull-adjustable trimaran can pass through a narrow channel conveniently.

The invention discloses a following wake tube of a ship, which is used for solving some problems existing in flow fields and the efficiency of a ship body and a propulsion system thereof in the prior art. The following wake tube of the ship is a pipeline system for communicating a waist flow field and a stern flow field of the ship, wherein a water inlet of the following wake tube is arranged on the side face or the bottom of the waist of the ship; a water outlet of the following wake tube is arranged on the side face, the bottom or the end face of the stern or the outlet part of the following wake tube extends out of the side face, the bottom or the end face of the stern; and the middle part of the following wake tube is arranged inside the ship. The a following wake tube of the ship improves and optimizes the flow fields of the ship body and the propulsion system thereof, recycles a part of energy of the following wake of the ship and the effluent of the propulsion system and reduces the wave making resistance of the ship so as to enhance the ship body efficiency and the propulsion efficiency of the ship. The presence of the following wake tube of the ship is also beneficial to the matching and installation of the propulsion system relative to the ship body.

The invention discloses a method for acquiring container ship resistance. The method includes: firstly, designing or measuring principal dimensions and related parameters of a ship; secondly, acquiring draft total resistance or ballast draft total resistance by the method according to the ship type and the draft / ballast draft statues. The optimized ship wet-surface area calculation method and the optimized wave-making resistance and frictional resistance calculation method are adopted respectively. In addition, by comparing the method with actual ship model test, a novel total-resistance correction method is determined, and a resistance calculation method high in calculating precision and widely applicable is provided for shipping engineers in the initial design phase of container ships, so that ship design efficiency is improved greatly. The method for acquiring container ship resistance is applicable to the ship design phase and the ship resistance actual-detection phase and has the advantages of convenience, high efficiency and accuracy in results.

The invention discloses a vertical bow and front edge drainage combined damping structure used for a low speed full formed ship of which the ship speed is lower than 12 knots and a block coefficient (CB) is larger than 0.8. The structure comprises a ship body, a vertical bow is arranged at the head position of the ship body, the front end of the vertical bow is provided with a round hole, a rounded rectangle hole is formed in the tail of the ship body, the round hole and the rounded rectangle hole are communicated from front to back and are in smooth transition in the ship body to form a runner through which fluid passes. The invention innovatively puts forwards a concept of the vertical bow instead of a bulbous bow; further, a vertical bow technology and a front edge drainage technology are combined to effectively reduce wave-making resistance, and further reduce viscosity pressure resistance in a greater degree, and total resistance of the whole ship is reduced by more than 3%.

The invention relates to a device and a method for reducing the wave-making resistance of a warship, which includes a hull, the lower part of the bow of the ship hull is provided with a forward projecting mechanism extending out of the ship hull, and an inner cavity is arranged inside the protruding mechanism, the inner cavity is communicated with an air source arranged in the hull through a gas pipe, A gas flow regulating device is arranged on the trachea, the protruding mechanism is provided with a nozzle communicated with the inner cavity, The invention is used for ejecting bubbles to change the height, phase and frequency of the first wave of the warship, and the aspect ratio of the warship to achieve the purpose of reducing the wave resistance, and the ejected bubbles can reduce the frictional resistance of the surface warship, increase the speed of the surface warship, save the energy consumption and carbon emission in the shipping process, and the gas source is provided with anozone generator. When needed, ozone is injected through the nozzle along with the bubbles to reduce the breeding of aquatic organisms, reduce the daily maintenance workload, reduce fuel consumption ofships, increase ship speed and reduce emissions.

The invention provides water bulk cargo transporting equipment applicable to coastal water areas and Yangtze River areas. The water bulk cargo transporting equipment is a ship comprising a stem, a midship part of a ship body, a stern and a cargo space, wherein the ship includes length between vertical lines, molded breadth and moulded depth; and the product of sum of the length between vertical lines and the molded breadth is 390 to 460 times of the moulded depth. The water bulk cargo transporting equipment is a shallow-draft ship applicable to coastal water areas, so that the loss for detention of the ship due to the influence from tidewater during leaving a port can be reduced; and with the curved surface on the appearance, the water bulk cargo transporting equipment can reduce the wave-making resistance of the ship.

A spherical axe type ship bow suitable for a medium-high speed ship comprises a forward inclining stem and a forward protruding bulb nose-shaped bow body, wherein the bulb nose-shaped bow body is located under a designed waterline, and the horizontal length, protruding forward, of the bulb nose-shaped bow body becomes smaller gradually in the half-breadth direction from the two ends of the medium-high speed ship to the midline face of the medium-high speed ship; furthermore, on the midline face of the medium-high speed ship, the lower surface of the bulb nose-shaped bow body is connected with a vertical column above to form an axe-shaped bow, and the vertical column intersects with the designed waterline. By the adoption of the spherical axe type ship bow, during medium-high speed sailing of the ship, wave-making resistance can be effectively reduced, and splashing of the bow is avoided.

A marine self-priming pump water spray propelling outboard engine comprises an engine, a self-priming pump body, a water inlet pipe and a water outlet pipe. The engine is connected with the self-priming pump body. One end of the water inlet pipe is mounted on the self-priming pump body. The other end of the water inlet pipe is a water inlet which faces the advancing direction of a ship. One end of the water outlet pipe is connected with the top of the self-priming pump body. The other end of the water outlet pipe is a water outlet which is opposite to the advancing direction of the ship. A nozzle connected with the water outlet pipe through a universal joint is mounted at the water outlet of the water outlet pipe. The universal joint is connected with a directional operating lever. The nozzle is controlled to turn through the directional operating lever so as to control advancing direction of the ship. The brand new propelling manner of high-speed water spraying on water surface is adopted, wave-making resistance and eddy resistance during high-speed sailing of ships are reduced greatly, the unconquerable contradictory in acceleration of the underwater spraying propelling can be relieved, and high-speed, flexible and stable sailing performance is achieved.

The invention particularly discloses a diverging airbag dam-protection structure for a coal mine underground reservoir. The diverging airbag dam-protection structure comprises an I-shaped connector, adam-protection airbag, diverging columns, an artificial dam body and isolation coal pillars; the artificial dam body is designed as an I-shaped-like structure and mutually connected with the surrounding isolation coal pillars, and it is ensured that a dam body on an inner layer of the reservoir is flat; the diverging columns are built in the front of a dam, are each in a water drop shape, and canbe divided into front-end wave making columns and tail-end wake flow columns, the front-end wave making columns are each designed in a spherical shape for reducing the wave making resistance of a water body and diverging the water body, and the tail-end wake flow columns guide the diverged water body to flow so as to form different water body pressure distribution structures by dividing; and thedam-protection airbag is fixed between the diverging columns and the dam body, the rear part of each diverging column corresponds to a wave stop bag, gaps between the diverging columns correspond to force-unloading bags, the amount of filling gas in the dam-protection airbag is 60%-80% of the total filling amount, after the high-pressure water body behind the wake flow columns impacts to the wavestop bags, the gas escapes to the force-unloading bags, the force-unloading bags are pressed after turbulence of the water body, and the gas flows back to the wave stop bags.

The invention discloses a self-propulsion cutter suction dredger with a bulbous bow. The bulbous bow is arranged on a bow of a hull of the self-propulsion cutter suction dredger. A side thruster cabinis arranged in a bulbous bow area. A bow thruster is arranged inside the side thruster cabin. The side thruster cabin is arranged in the space between a bow anti-collision wall and a bulbous bow outer plate. The length of the bulbous bow is 1.5%-3.5% of the length of the hull. The bulbous bow area ratio of the bulbous bow is 0.1-0.25. Through the additionally-arranged bulbous bow and the bow lineoptimizing scheme, transition of the bow molded line is facilitated, and the inflow angle on the designed waterline of a large bow column in the prior art is decreased. Meanwhile, a head wave can beshifted forward, favorable interference is generated, accordingly the wave-making resistance and the total resistance of the dredger are reduced, and high-speed performance is improved. The arrangement space for the bow is enlarged, accordingly the scheme that the side thruster is arranged in the bow can be achieved, and the maneuverability of the dredger is improved.

The invention provides water bulk cargo transporting equipment applicable to coastal water areas and south areas of China. The water bulk cargo transporting equipment is a ship comprising a stem, a midship part of a ship body, a stern and a cargo space, wherein the ship includes length between vertical lines, molded breadth and moulded depth; and the product of sum of the length between the vertical lines and the molded breadth is 405 to 450 times of the moulded depth. The water bulk cargo transporting equipment is a shallow-draft ship applicable to coastal water areas, so that the loss for detention of the ship due to the influence from tidewater during leaving a port can be reduced; the water bulk cargo transporting equipment adopts straight stem to replace a bulbous stem of common ship, so that the difficulty in the construction of manufacture can be reduced; and with the curved surface on the appearance, the water bulk cargo transporting equipment can reduce the wave-making resistance of the ship.

The invention relates to a high-performance deep sea tuna seine ship, comprising a ship body (1); the tail of the ship body (1) is provided with a tail shaft (2) provided with a propeller (3); the high-performance deep sea tuna seine ship is characterized in that the head part of the ship body (1) is provided with a ball nose bow (4) extending forwards; the ball nose ball (4) is positioned below the waterline at the head part of the ship body and is in a flat streamline shape. Head waves generated by the ball nose bow with such a shape and the making wakes of the main ship body can generate favorable disturbance to reduce the wave-making resistance components of the whole ship, the pressure difference resistance components of the head part of the ship can be effectively reduced by the flat streamline shape, energy conversation and emission reduction are realized, the deep sea tuna seine fishing operation efficiency is improved, and the sustainable development of the marine fishery is promoted.

The invention provides a pier wave-making resistance reducer comprising a reducer body and a slide rail. The reducer body is of a nasal shape and comprises a nose part at the rear front, a nose bridge part at the upper front and a back part. The back part corresponds with the surface of a pier in terms of shape, and is connected with the pier through the slide rail in a vertical direction, and the reducer body is capable of moving up and down freely along the slide rail. The nose part is of a hollow structure, and the joint between the noise part and the noise bridge part is flush with the water level under effect of buoyancy. The pier wave-making resistance reducer is capable of effectively reducing water flow wave-making resistance and reducing impact to the pier from water flow so as to guarantee safety of the pier in the flood season.

The invention relates to a supercavitation high-speed ship, and belongs to the technical field of high-speed ship application. The supercavitation high-speed ship comprises underwater submerged bodies, a support structure and a ship body. Each underwater submerged body is composed of two rotary bodies, wherein the heads of the rotary bodies are provided with the disc cavitators, and the middle cylindrical sections are provided with the annular cavitators. The support structure is connected with the two underwater submerged bodies and is in lap joint with the ship body. The cross section of theship body is designed into a deep V shape with a small waterline surface, so that the wave-making resistance can be reduced, and the seakeeping of the ship is improved. When the ship body is at a static or low-speed stage, a rotating device is rotated to put down a flat plate, so that the waterline area is increased through the arrangement of the flat plate, and the stability at the static and low-speed movement is maintained. After the ship body reaches a certain speed, the rotating device tightens a steel wire rope to retract the flat plate to be tightly attached to the surface of the shipbody, so that the wave-making resistance and the friction resistance caused by the flat plate are reduced. And meanwhile, through the manual ventilation and the auxiliary effect of the disc cavitators, the middle annular cavitators and the ventilation devices, the supercavitation bubbles are generated to wrap the submerged bodies, and the frictional resistance of the submerged bodies is reduced.

The invention relates to a duct-type ship propeller comprising: a propeller, a hull arranged at the lower part of the hull, a middle partition arranged in the hull, two inlet channels symmetrically arranged at the two sides of the middle partition and penetrating with the front end of the hull, a built-in rudder arranged on the middle partition, and an outlet channel arranged at the rear end of the hull and communicated with the front end of the inlet channel. The propeller is located in the outlet channel; the underside of the inlet end of the inlet is below the unloaded draft line of the hull. The channel-type ship propeller enters the water flow from two inlet channels connected with the front end of the hull during navigation to reduce the resistance and squeeze of the bow of the shipby the water, and the wave-making resistance is small during high-speed navigation to reduce the power loss, and the ship sails smoothly; through the built-in rudder to adjust the ship navigation direction, propeller, built-in rudder inside the shell will not hang fishing nets, aquatic plants, etc., and will not collide with the reef, etc. to improve safety and service life.

The invention provides an unmanned patrol boat. Anti-wave devices are arranged at the two sides of the surface of a deck. When the patrol boat encounters extreme weather, a drive assembly drives the other end of a connecting rod, an anti-wave floating bowl rotates around the joint of the connecting rod and a fixing support, and then the bottom of the anti-wave floating bowl is flush with the watersurface profile; accordingly, the stability of the hull moving process can be improved; a solar panel is arranged on the hull for supply power to electrical apparatus elements on the hull, and the cruising ability of the unmanned boat is improved; lower fenders are arranged under the water surface profile and a bulbous bow is formed, so that wave-making resistance is reduced; tiny waves are formed at the intervals of the lower fenders, so that bow waves and stern waves are offset, and therefore the wave-making resistance can be lowered to the maximum extent.

The invention provides a ship and relates to the technical field of ship engineering. The ship comprises a ship body provided with board parts, wherein longitudinal internal grooves are symmetrically formed in left and right freeboards. The ship has the function that the wave-making resistance and / or rough water resistance of the ship body is reduced.

The invention discloses a static buoyancy water suction type new concept ship. By means of the negative-pressure water suction of a water suction end of a water jet pump in operation, the navigational drained water is sucked, so that the flow rate and the flow velocity of the drained water are reduced, the interfering energy for a free water surface is reduced, and the wave-making resistance to the ship is reduced. If the performance indexes (flow and lift) of the water jet pump are matched with the navigational water discharge and the resistance of the ship, the navigational drained water can be mostly sucked by the water jet pump, the flow rate and the flow velocity interfering with the free water surface are lower, and the wave-making resistance is reduced. That is, the water suction type new concept ship is an effective measure for overcoming the difficulty in increasing the navigational speed of a drainage type ship based on the Archimedes buoyancy principle. The basic structure of an underwater ship body of the water suction type ship is shown in figure 1, and consists of a main ship body (1), a lower plate body (2) and support side walls (3); and a space among the main ship body, the lower plate body and the support side walls is a working space for water jet propelling devices left in the underwater ship body, and comprises a water suction expansion port of the water jet pump and a conveying pipe.