Elliptic taper pore channel type underwater multiphase jet flow muffling noise reduction device

Abstract

An elliptic taper pore channel type underwater multiphase jet flow muffling noise reduction device comprises a tubular shell; four through holes are formed in the outer wall of the tubular shell circularly; a convergent effuser is fixed in the shell; the front end of the convergent effuser is an annular pore plate, the middle of the convergent effuser is a cylinder section, and the back end of the convergent effuser is a convergent nozzle; four elliptic taper through holes are formed in the outer wall face of the cylinder section circularly, and the ratio of the long axis to the short axis is between 1.5:1 to 2.5:1, and the axle wire is perpendicular to the axle wire of the convergent effuser; a front effuser is connected to the annular pore plate; the axis of the shell is provided with an inner conduit which is fixed on the inner wall of the convergent effuser; blades are arranged on the front of the inner conduit; a multi-hole nozzle is fixed on the inner wall of the outlet end of the inner conduit. The elliptic taper pore channel type underwater multiphase jet flow muffling noise reduction device is used for exhausting of an underwater vehicle, the device is compact in the structure, and can be installed on an exhausting system directly, no outer space is occupied, the air flow pulsation, turbulent jet noise and bubble noise are eliminated, the noise reduction spectrum ranges from the pulse frequency of 200hz to the high frequency 5000hz produced by turbulent jet, and the noise reduction result in higher than 18db.

Description

technical field [0001] The invention relates to an elliptical conical channel type underwater multi-phase jet noise reduction and noise reduction device, which is used for noise reduction of waste gas emission in thermal power systems of underwater vehicles. 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, accomp...

AI Technical Summary

Problems solved by technology

[0005] No multiphase jet noise reduction device for high-speed gas jets of underwater vehicles has been found so far

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