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Oval partition plate nozzle modification method for increasing acoustic energy dissipation

A baffle and nozzle technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems affecting the normal progress of system tasks, unstable combustion in the combustion chamber, and pressure fluctuations in the combustion chamber, achieving easy processing, Simple structure, increase the effect of sound energy dissipation

Active Publication Date: 2021-01-08
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the working process of the liquid rocket engine, combustion instability is very easy to occur in the combustion chamber. Combustion instability will bring great harm, cause violent fluctuations in the pressure in the combustion chamber, and even cause structural damage, affecting the normal operation of the system. conduct

Method used

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  • Oval partition plate nozzle modification method for increasing acoustic energy dissipation
  • Oval partition plate nozzle modification method for increasing acoustic energy dissipation
  • Oval partition plate nozzle modification method for increasing acoustic energy dissipation

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Embodiment Construction

[0055] The present invention will be described in detail below in conjunction with the accompanying drawings. In this embodiment, the sound energy dissipation is effectively increased by changing the eccentricity of the elliptical partition nozzle, and the specific implementation is described as follows:

[0056] In this embodiment, under normal temperature and pressure, the operating frequency f is selected to be 1000 Hz, and the longitudinal semi-axis length of the separator nozzle is L 1 10mm, the range of eccentricity is 0~0.9, the minimum clearance b m The change range is 0-0.5mm. By calculating the wave equation, the law of the maximum sound energy dissipation changing with the eccentricity is obtained, as shown in the figure. image 3The working frequency is 1000Hz, the longitudinal semi-axis length of the diaphragm nozzle is 10mm, the variation range of the minimum gap is 0-0.5mm, and the law of the maximum sound energy dissipation with the eccentricity of the ellipse...

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Abstract

The invention relates to an oval partition plate nozzle modification method for increasing acoustic energy dissipation. The oval partition plate nozzle modification method is mainly used for controlling combustion instability of a rocket engine. According to the calculation method, the average value of disturbance parameters is calculated on a section, a pressure wave equation is obtained, and thewave equation can be calculated through a numerical method. The length of a longitudinal semi-axis is fixed to be unchanged, the eccentricity of the oval partition plate nozzle is changed by changingthe length of the transverse semi-axis, and the maximum value of the sound wave dissipation coefficient under different minimum gaps is calculated. The method is suitable for various rocket engine partition plate nozzles, acoustic energy dissipation can be increased, and control over combustion instability is facilitated.

Description

technical field [0001] The invention relates to a method for repairing the shape of an elliptical diaphragm nozzle for increasing sound energy dissipation, which is mainly used in the combustion instability control of liquid rocket engines. Background technique [0002] During the working process of the liquid rocket engine, combustion instability is very easy to occur in the combustion chamber. Combustion instability will bring great harm, cause violent fluctuations in the pressure in the combustion chamber, and even cause structural damage, affecting the normal operation of the system. conduct. Acoustic instability is a form of combustion instability in the combustion chamber. Due to the heat release and the coupling of the acoustic system of the combustion chamber, the sound waves continuously gain energy and eventually produce severe pressure oscillations. Therefore, the research on the acoustic system of the combustion chamber is helpful to understand and control the p...

Claims

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Application Information

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IPC IPC(8): G06F30/17G06F30/23G06F30/28G06F113/08G06F119/08G06F119/14
CPCG06F30/17G06F30/23G06F30/28G06F2113/08G06F2119/08G06F2119/14
Inventor 杨立军李敬轩朱烁烁
Owner BEIHANG UNIV
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