Guidance and control algorithm of terminal normal shock for ramjet engine supercritical operation = 램제트 엔진의 초임계 운전을 위한 종말 수직 충격파의 유도 및 제어 알고리듬

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This thesis represents the scheme for guidance and control algorithm of terminal normal shock for ramjet engine supercritical operation. The ramjet engine is air-breathing engine for supersonic flight, it compress the incoming air via its own shape without extra facilities for compression. Incoming air flow goes through the thread of oblique shocks and finally decelerated to subsonic flow after a terminal normal shock. The position and its strength of the terminal normal shock are regarded as one of the most significant factors to evaluate engine’s efficiency. General operation of the engine may undergo through ambient disturbances which are from freestream and engine’s combustor. The disturbances alter the shock equilibrium, which cause the arbitrary variation of the shock location. As a result, the terminal shock may fall in an abnormal operation called buzz or unstart, as the shock are pulled out of engine’s intake exceeding the diffuser throat. In this thesis, the way to find optimal position of the shock is firstly studied for high efficient and stable operation of the engine. The scheme to determine optimal position is used as one possible methodology to design a guidance law. And then, the shock is guided to designated position and regulated at that point via shock position control algorithm. The details for guidance and control of the terminal shock to guarantee to hold the shock in a preferred region under the perturbations take our main part. Also, an approach is introduced to stabilize the shock under Mach number control of ramjet powered vehicle as addressing engine’s internal dynamics and the response characteristics of the shock.
Advisors
Tahk, Min-Jearesearcher탁민제
Description
한국과학기술원 : 항공우주공학전공,
Publisher
한국과학기술원
Issue Date
2012
Identifier
512042/325007  / 020095069
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 항공우주공학전공, 2012.8, [ vii, 105 p. ]

Keywords

ramjet supercritical operation; freestream and combustor disturbances; 초음속 엔진; 공기 및 연소기 외란; 충격파 유도 및 제어; shock position guidance and control

URI
http://hdl.handle.net/10203/179622
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=512042&flag=dissertation
Appears in Collection
AE-Theses_Ph.D.(박사논문)
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