Silencer for noise generated by storage box deflating and pipeline blowing in space launch site

A technology for noise reduction devices and launch sites, which can be used in rocket launchers, sound-generating devices, instruments, etc., and can solve the problems of narrow noise reduction band, poor high-frequency noise reduction effect, and short service life of impedance composite silencers, etc. It achieves the effect of convenient and reliable installation and use, good application prospects and meeting the requirements of high cleanliness

Inactive Publication Date: 2019-08-16
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, the rocket system has very high requirements on the cleanliness of the test workshop, so it is not feasible to adopt the sound-absorbing material to reduce the noise. ; Impedance compound muffler has a short service life and is also not feasible

Method used

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  • Silencer for noise generated by storage box deflating and pipeline blowing in space launch site
  • Silencer for noise generated by storage box deflating and pipeline blowing in space launch site
  • Silencer for noise generated by storage box deflating and pipeline blowing in space launch site

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] specific implementation plan

[0019] Step 1. Analysis of the mechanism of noise generation in the launch site storage tank venting and pipeline blowing

[0020] Aerodynamic noise is caused by the unsteady process of the gas, or the disturbance of the gas, and the interaction between the gas and the object. The continuity equation for turbulent gas is

[0021]

[0022] In the formula, ρ——density; ν i - Airflow at x i The velocity in the direction; t—time; Q—the emission amount of the source per unit time and unit volume.

[0023] The equation of motion is

[0024]

[0025] where F i ——Generalized force per unit volume; ρν i ν j ——shear pressure tensor; p ij —the compressive stress tensor related to compressive stress and viscous force.

[0026] Carry out time differentiation on formula (1), and perform x on formula (2) i Differential, calculated to get

[0027]

[0028] In the formula

[0029] During the process of deflation of the storage tank an...

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Abstract

In the carrier rocket launch testing process in a launch site, harsh noise of 120 decibels can be generated at the time of storage box deflating and pipeline blowing, far exceeding the national allowable standard of 85 decibels, and normal testing on the work site and the physical and mental health of staff are seriously affected. The noise generated by storage box deflating and pipeline blowing is subjected to generation mechanism analysis, the gas Mach number, the gas flow rate, the drag coefficient, the pipeline outlet flow rate and other noise related parameters are calculated, and a metal-microperforated-plate based silencer for noise generated by storage box deflating and pipeline blowing in the space launch site is designed according to the environmental requirements of the launch site. The designed silencer can reduce the noise of storage box deflating and pipeline blowing of a carrier rocket to 85 decibels or below, the noise allowable standard stipulated by the state is met,and the noise pollution problems caused by storage box deflating and pipeline blowing in the launch site are solved.

Description

technical field [0001] The invention belongs to the field of aerospace testing and launching, and relates to a special muffler device for eliminating noises generated during deflation of a carrier rocket storage tank and blowing off of a pipeline at an aerospace launch site. Background technique [0002] During the test launch of the launch vehicle at the launch site, the noise generated when the power system rocket storage tank is vented and the pipeline is blown off is about 120 decibels, far exceeding the national allowable standard of 85 decibels, which seriously affects the normal operation of various systems at the work site The physical and mental health of people at work and in the field. At present, domestic launch sites do not have special sound-absorbing equipment to reduce the noise of rocket storage tank degassing and pipeline blowing, so we can only arrange this work separately and minimize the number of on-site personnel. Therefore, it is necessary to design ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162F41F3/04
CPCF41F3/04G10K11/162
Inventor 白国玉段永胜李严武李鹏冲冯丑明李红宇李苗苗牟万辉林中正贾涛
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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