An underwater multiphase jet noise reduction device
A technology of noise reduction and snap ring grooves, which is applied to mufflers, exhaust devices, engine components, etc., can solve problems such as multiphase jet noise reduction devices that have not yet been found, and achieve the effect of compact structure and elimination of airflow pulsation
Active Publication Date: 2016-06-15
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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Problems solved by technology
[0005] No multiphase jet noise reduction device for high-speed gas jets of underwater vehicles has been found so far
Method used
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[0041] The present invention is described in detail below in conjunction with accompanying drawing:
[0042] figure 1 The overall figure shown has: shell 1, outlet inner snap ring 2, flower-shaped folded guide pipe 3, positioning inner snap ring 4, rear snap ring 5, annular orifice plate 6, rear nozzle pipe 7, front Arranged nozzle 8, front snap ring 9, blade 10, inner conduit 11, front finned plate 12, rear finned tube 13, multi-hole nozzle 14, tapered V-shaped nozzle 15.
[0043] The shell 1 is the shell of the underwater multiphase jet noise reduction and noise reduction device, and all components are wrapped in it;
[0044] The flower-shaped folded guide tube 3 is installed on the outlet end of the housing 1, and is positioned by the outlet inner snap ring 2 and the positioning inner snap ring 4;
[0045] The four corresponding round holes on the front side of the ring plate of the annular orifice plate 6 are welded with the rear nozzle 7, and the annular orifice plate 6 i...
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The invention provides an underwater multi-phase jet flow silencing and noise reducing device, which comprises a tubular casing, wherein four oval cone-shaped through holes are formed in the outer wall of the tubular casing in the annular direction, the outer wall hole diameter is greater than the inner wall hole diameter, the end surface is in an oval shape, the major-minor axis ratio is 1.5:1 to 2.5:1, a gradually reducing spray pipe is fixedly arranged in the casing, the front end of the gradually reducing spray pipe is provided with an annular hole plate, the middle part of the gradually reducing spray pipe is provided with a round tube section, the back end of the gradually reducing spray pipe is provided with a gradually reducing spray nozzle, four through holes are annularly formed in the outer wall surface of the round tube section, the annular hole plate is connected with a front spray pipe, an inner catheter is arranged on the axial line of the casing and is fixedly arranged on the inner wall of the gradually reducing spray pipe, the front part of the inner catheter is provided with a blade, and a porous spray head is fixedly arranged on the inner wall of the outlet end of the inner catheter. The underwater multi-phase jet flow silencing and noise reducing device is used for underground vehicle exhaust, the structure of the device is compact, the device can be directly arranged in an exhaust pipe system and does not occupy the external space, the airflow pulsation, the turbulent and jet flow noise and the bubble noise are eliminated, the noise reducing frequency band is from the pulsation low frequency being 200Hz to the turbulent and jet flow generated high frequency being 5000Hz, and the noise reducing effect is higher than 18dB.
Description
technical field [0001] The invention relates to an underwater multi-phase jet noise elimination and noise reduction device, which is used for noise reduction of waste gas emission in a thermal power system of an underwater vehicle. Background technique [0002] The high-pressure and high-temperature exhaust gas discharged from the thermal power system of the underwater vehicle is discharged into the water through the nozzle, forming serious jet noise. Since the propagation of sound depends on the compressibility of the medium, the speed of sound in water is usually about 4.4 times the speed of sound in air, and the propagation speed of underwater noise is much greater than the speed of underwater vehicles. When a large amount of exhaust gas generated by the thermal power device of the underwater vehicle is discharged into the water at high speed through the outlet pipe, a complex gas flow, gas-liquid two-phase flow field structure is formed, accompanied by exhaust radiation ...
Claims
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IPC IPC(8): F01N13/00
Inventor 郝宗睿别海燕徐娟
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI