Throttling Process and Buzz Mechanism of a Supersonic Inlet at Overspeed Mode
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- 所属单位：能源与动力学院
- 发表刊物：AIAA JOURNAL
- 关键字：HYPERSONIC INLET COMPRESSION FLOW UNSTART
- 摘要：A rectangular external-compression supersonic inlet with a shock-on-lip Mach number of 2.0 is carefully studied at a freestream Mach number of 2.5. In the throttling process before the onset of buzz, the interaction between the ramp shock and the cowl-induced bow shock appears as regular reflection, Mach reflection, and lambda-shaped pattern successively. It is interestingly found that the currently observed Mach reflection, which should have been broken down shortly after the emergence as reported previously, keeps fairly stable until the throttling ratio changes. In the remaining buzz stage, three types of instabilities of similar frequencies but of different oscillating behaviors and amplitudes are observed. The term medium buzz is adopted to describe the special buzz phenomenon with moderate oscillations. It is shown that both the little buzz and big buzz are characterized by the separation oscillation, whereas the medium buzz features the oscillation of the cowl-induced bow shock. Further analysis indicates that all three buzz phenomena probably share a common origin (i.e., the ramp-side flow separation). Also, it is demonstrated that the transition of buzz flows in the throttling process is attributed to the changes of disturbance strength and dominant role between two feedback loops.
- ISSN号：0001-1452
- 是否译文：否
- 发表时间：2018-05-01
- 合写作者：陈昊,F70206449
- 通讯作者：谭慧俊
- 发表时间：2018-05-01
