Experimental study on high-frequency combustion instability of liquid-propellant rocket engines using off-design combustion model
Experimental study on high-frequency combustion instability of liquid-propellant rocket engines using off-design combustion model
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DOI：
10.1016/j.actaastro.2022.11.006
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发表时间：
2022-11
影响因子：
3.5
通讯作者：
T. Kanda;Yuuki Mishina;Shoma Hayasako;Shunta Muramatsu;Kanna Yamada;R. Kato
中科院分区：
文献类型：
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作者：
T. Kanda;Yuuki Mishina;Shoma Hayasako;Shunta Muramatsu;Kanna Yamada;R. Kato
利用小型实验模型对液体火箭发动机高频燃烧不稳定性进行了燃烧试验研究。该模型模拟了火箭发动机推进剂喷射器周围的底座空间。在本研究中，我们假设非设计燃烧发生在由喷射推进剂和喷射器面板形成的底部空间，并研究了燃烧在底部空间内的传播和重复。该模型有两个基本空间，在这两个空间中研究了燃烧的传播。推进剂为异丙醇和气态氧。以异丙醇为替代燃料，研究了高密度火箭推进剂的喷射和燃烧动力学。测试结果表明，(1)压力在毫秒内比燃烧前高出20倍；(2)火焰从一个基地空间传播到另一个基地空间；(3)燃烧多次重复；(4)基地空间外的压力大几十%到几倍。传播的和重复的燃烧，如(2)和(3)，可以产生比单一燃烧的频率更高的压力变化。实验结果表明，底部空间的非设计燃烧可能是高频燃烧不稳定的一种机制。
Combustion tests were conducted to investigate the high-frequency combustion instability of liquid propellant rocket engines using a small experimental model. The model simulates the base space around the propellant injectors of rocket engines. In this study, we presumed that off-design combustion occurred in the base space created by the injected propellants and injector faceplate, and investigated the propagation and repetition of combustion in the base space. The model has two base spaces in which the propagation of combustion was examined. 2-Propanol and gaseous oxygen were used as propellants. 2-Propanol was used as a substitute fuel to study the injection and combustion dynamics of high-density rocket propellants. The test results revealed that (1) the pressure changed up to 20 times higher than the pressure prior to combustion within a millisecond; (2) the flame propagated from one base space to another; (3) combustion was repeated several times, and (4) the pressure outside the base space was dozens of percent to several times greater. The propagated and repeated combustions, as in (2) and (3), can produce a pressure change of a higher frequency than the frequency due to a single combustion. The experimental results indicated that off-design combustion in the base space could be a mechanism for high-frequency combustion instability.