|Table of Contents|

Analysis on factors affecting error between acoustic measurement and simulation of combustor chamber(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2020年04期
Page:
60-66
Research Field:
研究与设计
Publishing date:

Info

Title:
Analysis on factors affecting error between acoustic measurement and simulation of combustor chamber
Author(s):
WANG Guangxu1; ZHANG Zhitao2; TAN Yonghua2; CHEN Jianhua1; CHEN Hongyu1
(1. Science and Technology on Liquid Rocket Engine Laboratory, Xi’an Aerospace Propulsion Institute,Xi’an 710100,China; 2.Academy of Aerospace Propulsion Technology,Xi’an 710100,China)
Keywords:
acoustic measurement;  acoustic simulation;  acoustic experiment;  error analysis;  combustion instability
PACS:
V434.13
DOI:
-
Abstract:
Dynamic pressure data is very important for the analysis of acoustic properties and combustion instability in combustion chamber. Due to the limited number of measuring points,the acoustic simulation is also needed to obtain mode distribution and response curve to provide multi-dimensional information for actual engineering analysis. In some cases,the frequency interval between the primary and secondary modes is too small,and the amplitude of the primary mode is not prominent. The error between acoustic measurement and simulation will seriously affect the judgment of the actual acoustic mode type. Through the acoustic simulation and experiment of a sub-scaled gas generator,the error sources were specifically analyzed,including the sampling point position,the inlet temperature,the recessed small cavity for injection and measurement. It is indicated that the acoustic simulation has enough precision to achieve the actual mode frequency distribution,but the frequency difference caused by temperature variation should not be ignored. Furthermore,the mode amplitude should be reconsidered when the sampling point is not in anti-node area. The recessed small cavity for injection or measurement will decrease or increase the amplitude of a certain specific mode,respectively.

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Last Update: 2020-07-30