Method for increasing thrust for water jet propulsion unit

Abstract

The invention relates to a method for increasing thrust for a water jet propulsion unit, in particular to a method for increasing thrust for a water jet propulsion unit by the aid of lead-in air. The method includes that the water jet propulsion unit is mounted at a predetermined position of a ship, and comprises a power engine, a water guide channel and a nozzle, the power engine is used for driving a propeller, the propeller is accommodated in the water guide channel, and the nozzle is arranged at an outlet end of the water guide channel; more than one air releasing outlet is arranged in a region in the water jet propulsion unit, and high-speed axial water flow flows through the region; an air lead-in device is provided and comprises at least one air guide tube, an air inlet at the upper end of each air guide tube is arranged at a predetermined position of the ship, and the lower section of each air guide tube is connected to the corresponding air releasing outlet; negative pressure is generated at each air releasing outlet by the high-speed axial water flow in the water jet propulsion unit by employing a Bernoulli's principle so as to suck air; and after the air flows into the air releasing outlets from the air guide tubes, is exhausted via the air releasing outlets and is mixed with water, numerous bubbles are formed. The air is led into the water jet propulsion unit by the aid of the negative pressure, so that the efficacy of increasing the thrust is achieved.

Description

technical field [0001] The invention relates to a method for increasing the thrust of a water-jet propulsion device, in particular to a method for increasing the thrust of a water-jet propulsion device by using the introduced gas. Background technique [0002] At present, the methods for increasing the thrust of water jet propulsion devices generally include: increasing the propeller horsepower, or designing different propeller shapes, propeller angles of attack, or mechanical methods such as transmission systems for different needs. [0003] figure 1 Shown is a schematic structural view of a conventional water jet propulsion device 10 for a hull 20 , which includes a power engine 11 , a water guide channel 12 , a propeller 13 , a nozzle 14 and a guide nozzle 15 . [0004] figure 2 Shown is a schematic diagram showing the water flow of the above-mentioned water jet propulsion device 10 flowing through the nozzle 14. Since the outlet of the nozzle 14 is a pure water flow 1...

AI Technical Summary

Problems solved by technology

[0004] figure 2 Shown is a schematic diagram showing that the water flow of the above-mentioned water jet propulsion device 10 flows through the nozzle 14. Since the outlet of the nozzle 14 is a pure water flow 141, it cannot provide a strong reaction force to increase the thrust, so there is still room for improvement

[0005] However, in order to improve the above problems, an overly complicated design, or a design that changes the structure of the propeller, cannot be easily completed, and it will cost a lot of money

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