航天推进技术研究院主办
[1]汪广旭,张志涛,谭永华,等.燃烧室声学测量和仿真的误差影响因素分析[J].火箭推进,2020,46(04):60-66.
WANG Guangxu,ZHANG Zhitao,TAN Yonghua,et al.Analysis on factors affecting error between acoustic measurement and simulation of combustor chamber[J].Journal of Rocket Propulsion,2020,46(04):60-66.
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WANG Guangxu,ZHANG Zhitao,TAN Yonghua,et al.Analysis on factors affecting error between acoustic measurement and simulation of combustor chamber[J].Journal of Rocket Propulsion,2020,46(04):60-66.
燃烧室声学测量和仿真的误差影响因素分析
《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]
卷:
46
期数:
2020年04期
页码:
60-66
栏目:
研究与设计
出版日期:
2020-08-18
- Title:
- Analysis on factors affecting error between acoustic measurement and simulation of combustor chamber
- 文章编号:
- 1672-9374(2020)04-0060-07
- Keywords:
- acoustic measurement; acoustic simulation; acoustic experiment; error analysis; combustion instability
- 分类号:
- V434.13
- 文献标志码:
- A
- 摘要:
- 动态压力数据对于燃烧室声学特性及燃烧不稳定性的分析具有十分重要的意义,由于测点数量有限,实际工程分析中还需要借助声学仿真补充模态分布及频响曲线等多维信息。某些情况下,主次模态频率间隔较小、主模态幅值不太突出,声学测量和仿真之间的误差会严重影响对实际声模态类型的判断。通过燃气发生器缩尺件声学实验及仿真计算,具体分析了在燃烧室声学特性分析过程中的各种误差源,其中包括测量点位置、来流温度、喷注及测量缩进小腔等。研究表明:声学仿真能够准确得到实际的声学模态频率分布,平均温度引起的频率差异不可忽略,非波腹位置处测量的模态幅值需要考虑测点位置的影响,喷注缩进小腔能使特定模态幅值降低,而测量缩进小腔会导致某阶模态幅值的测量结果偏高。
- 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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备注/Memo
收稿日期:2019-11-08; 修回日期:2020-03-21
基金项目:国家自然科学基金(11602186)
作者简介:汪广旭(1987—),男,博士,高级工程师,研究领域为液体火箭发动机雾化燃烧及燃烧不稳定性
更新日期/Last Update:
2020-07-30