火箭推进2025，Vol.51Issue(6)：15-24,10.DOI:10.3969/j.issn.1672-9374.2025.06.002
考虑多喷嘴混合头部的模拟燃烧室稳定性分析
Analysis on combustion instability of a model combustor considering multi-injector mixing head
摘要
Abstract
Mixing head is a critical component of high-performance staged-combustion engine thrust chambers,playing a key role in suppressing tangential combustion instability.To investigate the suppression characteristics of mixing head on tangential combustion instability in thrust chambers,a simulated combustor incorporating the mixing head was designed.By intentionally exciting high-frequency tangential combustion instability phenomena within the simulated chamber,the amplitude distributions of first-order and second-order tangential sub-harmonics were obtained under varying conditions(with/without convergent exits and different rectification cavity heights)relative to tuned injector lengths.Building on this,a linear stability analysis model was employed to calculate the first-order tangential growth rates of the simulated combustion chamber across different injector lengths,yielding dimensionless acoustic pressure amplitude distributions under various operating conditions.Key findings demonstrate that both rectification cavity height and convergent exit diameter significantly influence combustion stability.When the injector length equals an integer multiple of the half-wavelength corresponding to the chamber's first-order tangential frequency signal,complete suppression of tangential combustion instability is achieved.However,the stability gradient proves particularly steep near the optimal injector length-practical designs should therefore maintain injector lengths within 5％of this optimum value.关键词
补燃发动机/混合头部/燃烧不稳定/声学阻尼/调谐喷嘴Key words
staged-combustion engine/mixing head/combustion instability/acoustic damping/tuned injector分类
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汪广旭,张彪,杨尚荣,肖虹..考虑多喷嘴混合头部的模拟燃烧室稳定性分析[J].火箭推进,2025,51(6):15-24,10.基金项目
国家重点实验室基金项目 （）
