59results about How to "Increase turbulent kinetic energy" patented technology

A detonation chamber for a pulse detonation combustor including: a plurality of dimples disposed on at least a portion of an inner surface of the detonation chamber wherein the plurality of dimples enhance a turbulence of a fluid flow through the detonation chamber.

The invention discloses a dry-pulverized-coal gasification combined burner comprising a pulverized coal burner and an igniting burner. The pulverized coal burner sequentially comprises a first water-cooling jacket, a pulverized coal channel, a first oxidant channel and an inner barrel from outside to inside. The pulverized coal channel is directly adjacent to the first oxidant channel, and contracts toward the axial direction of the pulverized coal burner, at a position, adjacent to a flame-forward end. The first water-cooling jacket comprises a first water-inflowing channel, a window-type water-cooling groove and a first water-outflowing chanel, and the first water-inflowing channel is communicated with the first water-outflowing channel through the window-type water-cooling groove which is spirally wound at the flame-forward end of the pulverized coal burner. The igniting burner is arranged in the inner barrel and comprises a second water-cooling jacket, a second oxidant channel, a fuel channel, an igniter and a center nitrogen channel. By the arrangement, an ignition process is simplified, and reliability of ignition and operation of pulverized coal is improved; flame diameter is effectively controlled, a membrane water-cooling wall is prevented from being damaged by flames, and reliability of a gasification furnace is improved.

The invention relates to a cross orifice typed injection nozzle for an internal-combustion engine and belongs to an oil injection device of a fuel system of the internal-combustion engine. The nozzle is a precision coupling formed by an injector valve body and an injector valve. The head of the injector valve body is provided with at least one cross sub-orifice and each cross orifice is formed by crossing and collecting of at least two sub-orifices. As the collection of fuel in the sub-orifices of the cross orifice can form intense disturbance, the turbulent kinetic energy is increased and the atomization is improved; as an outlet of the cross orifice is formed by the collection of the sub-orifices, the flow area of the outlet is less than the sum of the outlet areas of all the sub-orifices, the injection nozzle is characterized by improving discharge coefficient like an analogous V-shaped gradually shrinking orifice. In brief, the crossing of the sub-orifices increases the internal flow, improves the turbulent intensity, causes the cross orifice to improve atomization, improves the quality of the mixed gas and leads to rapid, sufficient and perfect combustion, thus being beneficial to the further improvement of the economic performance, discharging performance and kinetic performance of the motor.

The invention provides a rapid combustor of an airflow hedging lean-burn natural gas engine. The combustor is positioned on the top part of a piston, and the shape of the combustor is necking shallow ampullaceous; a circular groove is arranged on the top part of the piston; the circular groove is communicated with the shallow ampullaceous combustor through four uniformly distributed chutes; when the piston is close to a compression upper dead center, the airflow is erupted out at a high speed from the circular groove through the chutes and hits against with the rotating vortex formed in the intake process to damage the vortex structure in the shallow ampullaceous combustor and increase turbulent kinetic energy in a cylinder, thereby enabling the natural gas engine to generate rapid combustion, expanding stable operational lean-burn limit of the engine, and improving the dynamic property, economical efficiency and emission performance of the engine.

Wave fins which are disposed inside a heat exchanger housing of a heat exchanger in order to cause a turbulent flow of fluid through direct contact with the fluid. The wave fins include a plurality of hills, a plurality of valleys and a plurality of sidewalls. The hills and valleys are connected to each other via the plurality of sidewalls. The sidewalls partition fluid passages between the hills and the valleys through which fluid passes. The hills, the valleys and the sidewalls form main waveforms that extend in a longitudinal direction so as to be waved in a first radius of curvature. One or more bent portions are formed on intermediate portions of the main waveforms, the bent portions being connected to remaining portions of the main waveforms so as to be bent at a second radius of curvature.

The invention discloses a piston with an unsmooth top. The piston comprises a piston matrix and the piston top, the piston top comprises a piston top base plane and a plurality of regularly arrayed piston top projections or pits, and the piston top projections or pits project outwards or recess inwards respectively. The piston has the advantages of simple structure and low manufacturing cost. When the piston and an engine cylinder are combined to form a combustion chamber, airflow can be distributed reasonably, tumble and break in a piston cylinder are accelerated, and turbulence intensity and turbulent kinetic energy are increased, so that gas mixture is combusted sufficiently in the engine cylinder, and further, combustion efficiency is improved, pollutant discharge is reduced, and fuel utilization rate is increased.

The invention discloses a dry-pulverized-coal gasification combined burner comprising a pulverized coal burner and an igniting burner. The pulverized coal burner sequentially comprises a first water-cooling jacket, a pulverized coal channel, a first oxidant channel and an inner barrel from outside to inside. The pulverized coal channel is directly adjacent to the first oxidant channel, and contracts toward the axial direction of the pulverized coal burner, at a position, adjacent to a flame-forward end. The first water-cooling jacket comprises a first water-inflowing channel, a window-type water-cooling groove and a first water-outflowing chanel, and the first water-inflowing channel is communicated with the first water-outflowing channel through the window-type water-cooling groove which is spirally wound at the flame-forward end of the pulverized coal burner. The igniting burner is arranged in the inner barrel and comprises a second water-cooling jacket, a second oxidant channel, a fuel channel, an igniter and a center nitrogen channel. By the arrangement, an ignition process is simplified, and reliability of ignition and operation of pulverized coal is improved; flame diameter is effectively controlled, a membrane water-cooling wall is prevented from being damaged by flames, and reliability of a gasification furnace is improved.

The invention discloses an integrated technique of desulfidation, denitration and mercury solidification in a boiler stove, and the invention injects modified MnO2 (manganese dioxide) into a boiler furnace and synthetically removes sulfur dioxide, nitrogen oxide and mercury by using the strong oxidizing property of manganese oxide; meanwhile, as the reaction of removing various infectants with modified MnO2 (manganese dioxide) is favorable for the conglobation of micro dust particles, the method can also reduce the exhaustion of inhalable particulates of PM2.5 from boilers.

A dual-pump body dual-suction type shield pump includes a pump inlet, a pump body, a dual-suction impeller, a bearing support, a thrust disc, a motor roller, a motor stator, a main shaft, a circulating water pipe, a pump outlet, an auxiliary bearing, a rotor shield casing, a stator shield casing and a dual-suction impeller suction inlet; an internal pump body is arranged in the pump body, the dual-suction impeller is arranged in the internal pump, and an outlet section of the internal pump body and an outlet section of the pump body are formed into a whole body; an auxiliary impeller is arranged at one side near the pump inlet of the outer wall of the internal pump body; a sealing section is arranged on the upper end of the dual-suction impeller; and the sealing section and the internal pump body form a three-dimensional space of a water pumping chamber. A large operation flow can be obtained on the premise of keeping high lift, and the operation range of the shield pump can be expanded; and meanwhile, automatic balance of axial water thrust can be achieved through the dual-pump body, the load of the thrust disc can be relieved, and the reliability of the shield pump can be improved.

The invention relates to the field of dual-fuel engines, in particular to a dual-fuel engine combustion device and method based on a double-needle-valve oil atomizer. The dual-fuel engine combustion device based on the double-needle-valve oil atomizer comprises an air distribution system, a fuel supply system and a combustion chamber system. The air distribution system is located on an air cylinder cover. An air inlet part and an exhaust part are symmetrically distributed at the two ends of the air cylinder cover. The fuel supply system is located on the air cylinder cover and is right opposite to the lower combustion chamber system. The combustion chamber system is formed by connecting the air cylinder cover and an air cylinder through bolts. The dual-fuel engine combustion method based on the double-needle-valve oil atomizer comprises the steps that firstly, the dual-fuel engine is in a gas mode; and secondly, the diesel oil mode is switched when the dual-fuel engine is in starting and idling work conditions. Dual-fuel engine gas and fuel oil dual modes are rapidly and flexibly switched, mixed gas concentration layering in the dual-fuel engine gas mode is achieved, and accordingly power performance, economic efficiency and discharging performance of the fuel are improved.

The invention belongs to the technical field of pistons, and particularly relates to a tumble guide type high compression ratio piston of a gasoline engine. The piston comprises a piston top face, a first boss top face, a second boss top face, a hemispheric piston pit, a first exhaust valve evasion pit extending surface, a second exhaust valve evasion pit extending surface, a first inlet valve evasion pit extending surface, a second inlet valve evasion pit extending surface and a tumble channel. The first exhaust and inlet valve evasion pit extending surfaces and the first boss top face together form a boss which is higher than the piston top face. The second exhaust and inlet valve evasion pit extending surfaces and the second boss top face together form a boss which is higher than the piston top face. The first and second boss top faces are parallel to the piston top face. The grooved tumble channel is located between the first boss top face and the second boss top face, and the upper surface of the tumble channel and the piston top face are in the same plane. The hemispheric piston pit is located at the geometrical center of the piston. By means of the shape of the piston surface, the high compression ratio is maintained, and meanwhile the tumble strength and the combustion speed are not reduced; and atomization of fuel oil and generation of a gas mixture are controlled, and the tendency of the knock is inhibited.

The invention discloses a reaction device, a production system and a production method for preparing low-carbon olefin. The reaction device is a pressure reaction device and comprises a device body, the device body comprises a combustion chamber, a mixing chamber and a cracking chamber which are sequentially communicated, the mixing chamber comprises a Venturi section and a raw material inlet, andthe raw material inlet is formed in the lowest pressure position of the Venturi section. According to the reaction device, the independent mixing chamber is arranged, the raw materials are mixed withthe synthesis gas in the mixing chamber and directly exchange heat, and the cracking reaction is performed after the cracking temperature is reached so that the reaction time can be shortened, and the yield of the low-carbon olefin is increased; the mixing chamber is constructed to comprise the venturi section, and the raw material inlet is formed in the lowest pressure position of the venturi section so that turbulent flow with higher turbulence is formed, higher convective heat exchange strength is achieved, raw materials can be quickly mixed and subjected to heat exchange with synthesis gas, and shorter retention time can be achieved.

The invention discloses a combustion chamber and a gas engine. The combustion chamber comprises a combustion chamber pit which is located in the top of a piston and concaves downwards relative to theupper top face of the piston, the combustion chamber pit comprises an airflow guiding pit and an airflow casting pit which are sequentially arranged, the bottom face of the airflow guiding pit is a tumble flow guide face, and the bottom face of the airflow casting pit is a tumble flow generation face; the tumble flow guide face gradually extends downwards from the upper edge of one side of the combustion chamber pit and is in smooth transition connection with the tumble flow generation face, and the tumble flow generation face is an inwards-concave curved face in smooth transition from the lower end of the tumble flow guide face to the upper edge of the other side of the combustion chamber pit. By means of the asymmetric combustion chamber pit structure, mixed gas rolls in the combustion chamber and forms tumble flow, so that turbulent energy of spark plug accessories is improved, transverse and longitudinal propagation speed of flames is increased, combustion characteristics of fuel gas are improved, and thermal efficiency of the gas engine is improved. The invention further discloses the gas engine comprising the combustion chamber.