Experimental and numerical investigation of mars-probe thermal radiation environment using a hydrogen-driven shock tube = 수소 고압부를 가진 충격관을 이용한 화성탐사체 열복사환경의 실험 및 수치적 연구

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The chemical process of CN formation in a CO-N2 mixture is studied through temporally-resolved intensity measurement of CN Violet radiation occurring in the reflected-shock region of a shock tube. A 78% CO-22% $N_2$ mixture is driven by cold hydrogen to a shock speed of up to 3.45 km/s, to produce a reflected-shock temperature corresponding to Martian entry flight of up to 6.4 km/s. Absolute calibration of spectrometer is performed using a standard lamp of radiance. A reaction model is constructed by combining four existing models and multiplying the $C_2$ dissociation rate by a factor of five. Spectral radiation from the shock layer ahead of a flat circular-disk model is measured along the stagnation line with the sodium-salicylate phosphor coated on the test window to measure the vacuum-UV radiation as well. The intensity of the chemiluminescence due to the radiative recombination of CO and O is stronger than that of the CN-violet band by an order of magnitude. The phosphorescent output reveals that the intensity of the CO4+ band is weaker than the existing numerical prediction by as much as a factor of 4.3.
Advisors
Chang, Keun-ShikresearcherPark, Chulresearcher장근식researcher박철researcher
Description
한국과학기술원 : 항공우주공학전공,
Publisher
한국과학기술원
Issue Date
2007
Identifier
263546/325007  / 020025227
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 항공우주공학전공, 2007.2, [ vii, 75 p. ]

Keywords

shock wave; spectroscopy; radiation; 화성대기진입; 비평형; 충격파; 분광기; 복사; Mars entry; nonequilibrium

URI
http://hdl.handle.net/10203/26349
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=263546&flag=dissertation
Appears in Collection
AE-Theses_Ph.D.(박사논문)
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