Low-Order Model for Buzz Oscillations in the Intake of a Ramjet Engine
Low-Order Model for Buzz Oscillations in the Intake of a Ramjet Engine
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DOI：
10.2514/1.50093
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发表时间：
2011-03
影响因子：
1.9
通讯作者：
Iksoo Park;N. Ananthkrishnan;M. Tahk;C. Vineeth;N. Gupta
中科院分区：
文献类型：
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作者：
Iksoo Park;N. Ananthkrishnan;M. Tahk;C. Vineeth;N. Gupta
嗡嗡声是指在混合压缩式超音速进气道中，终端激波周期性地被吸入进气道，然后被挤出的自持振荡。相应地，进入进气的空气质量流量和进气背压（燃烧室压力）波动。终端激波出现并以相对稳定的方式在进气道外建立的相关现象通常称为不启动。自从奥斯瓦蒂奇发现这种现象以来，嗡嗡声振荡一直困扰着每一种超音速进气道，冲压发动机也不例外。冲压发动机驱动的飞行器在加速爬升等机动过程中，存在进气道不起动或嗡嗡声的高风险，在加速爬升过程中，燃料喷射率必须在增加的推力要求和随高度降低的空气质量流量之间进行微妙的平衡。此外，可能引发嗡嗡声/不启动的大气扰动在低空最为严重，通常在加速爬升段开始时。因此，需要主动控制进气道中的末端激波的位置，通常通过规定一定的不起动/嗡嗡声裕度或Δ Ph。D.韩国科学技术院航空航天工程系学生，地址：373-1 Guseong-dong，Yuseong-gu，Daejeon 305-701; ispak@fdcl.kaist.ac.kr †韩国科学技术院航空航天工程系研究教授，大田市玉城区固城洞373-1，邮编305-701，韩国; drakn19@kaist.ac.kr韩国科学技术院航空航天工程系教授，373 -1 Guseong-dong，Yuseong-gu，Daejeon 305-701，South Korea; mjtahk@fdcl.kaist.ac.kr §Associate，IDEA Research & Development（P）Ltd，Magarpatta City，Hadapsar，Pune 411013，India; nitin@idearesearch.in <$CEO，IDEA Research & Development（P）Ltd，Magarpatta City，Hadapsar，Pune 411013，India; vineeth@idearesearch.in
Buzz refers to the self-sustained oscillations of the terminal shock in a mixed-compression supersonic intake where it is periodically sucked into the intake duct and then forced out. Correspondingly, the air mass flow rate entering the intake and the intake backpressure (combustion chamber pressure) fluctuate. The related phenomenon where the terminal shock emerges and establishes itself outside the intake duct in a relatively steady manner is usually called unstart. Buzz oscillations have plagued every type of supersonic intake ever since the phenomenon was discovered by Oswatitsch, and ramjets are no exception. There is a heightened risk of intake unstart or buzz for ramjet-powered vehicles during maneuvers such as accelerated climb where the fuel injection rate has to be delicately balanced between the increased thrust requirement and the decreasing air mass flow rate with altitude. Besides, atmospheric disturbances which may trigger buzz/unstart are the most severe at low altitudes, typical at the start of an accelerated climb segment. Hence, there is a need to actively control the position of the terminal shock in the intake duct, usually by prescribing a certain unstart/buzz margin or, ∗Ph. D. Student, Division of Aerospace Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea; ispak@fdcl.kaist.ac.kr †Research Professor, Division of Aerospace Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea; drakn19@kaist.ac.kr ‡Professor, Division of Aerospace Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea; mjtahk@fdcl.kaist.ac.kr §Associate, IDeA Research & Development (P) Ltd, Magarpatta City, Hadapsar, Pune 411013, India; vineeth@idearesearch.in ¶CEO, IDeA Research & Development (P) Ltd, Magarpatta City, Hadapsar, Pune 411013, India; nitin@idearesearch.in