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Other TitlePresent research of optical flow diagnostics technique at JAXA high-enthalpy wind tunnel
Author(jpn)水野 雅仁; 伊藤 健; 藤田 和央; 石田 清道; 長井 遵正; 藤井 啓介
Author(eng)Mizuno, Masahito; Ito, Takeshi; Fujita, Kazuo; Ishida, Kiyomichi; Nagai, Junsei; Fujii, Keisuke
Author Affiliation(jpn)宇宙航空研究開発機構; 宇宙航空研究開発機構; 宇宙航空研究開発機構; 宇宙航空研究開発機構; エイ・イー・エス; 宇宙航空研究開発機構
Author Affiliation(eng)Japan Aerospace Exploration Agency; Japan Aerospace Exploration Agency; Japan Aerospace Exploration Agency; Japan Aerospace Exploration Agency; Advanced Engineering Services Co. Ltd.; Japan Aerospace Exploration Agency
Issue Date2007-08-31
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication title第78回風洞研究会議論文集
Proceedings of the Wind Tunnel Technology Association 78th Meeting
Start page40
End page50
Publication date2007-08-31
AbstractIn order to characterize the high-enthalpy flow such as arc-heated wind tunnel and Inductively Coupled Plasma (ICP)-heated wind tunnel, two types of non-intrusive optical diagnostics method such as LIF (Laser-Induced Fluorescence) and emission spectroscopy is conducted. LIF diagnosis system for NO and O detection has been introduced in the 750 kW arc heated wind tunnel in JAXA. Parameters in the measurement have been optimized and operational wind tunnel conditions for the LIF measurement has been determined. Nitric oxide fluorescence was observed at a total enthalpy no greater than 10 MJ/kg. Whereas atomic oxygen fluorescence was observed at a total enthalpy less than 20 MJ/kg in this wind tunnel. It was observed that the center of excited wavelength is shifted in the shock layer. The Doppler shift due to the free stream velocity has a same order effect on excitation wavelength. The translational temperature was reduced from the measurement using spectral broadening of atomic oxygen excitation spectrum. Radiation spectroscopy of high-enthalpy flows in an ICP-heated wind tunnel is conducted to improve accuracy of the radiation code and to evaluate the flow properties in the test section of the wind tunnel in detail. Imaging spectroscopy is used to obtain the radial distribution of emission spectra at a time, from which radial profiles of emission intensity are obtained by the inverse Abel conversion. Molecular temperatures are determined by the spectrum fitting method in the aid of the radiation code, SPRADIAN2 (Structured Package for Radiation Analysis 2). In order to accomplish better agreement between numerical predictions and experiments, the theoretical models and spectroscopic data for the radiation code are replaced with more accurate ones to reflect experimental and theoretical results. The radial distribution of temperature is obtained in the test flow.
DescriptionJAXA Special Publication
Keywordswind tunnel test; high enthalpy wind tunnel; nonintrusive diagnostic; laser induced fluorescence; emission spectroscopy; nitric oxide; oxygen atom; shock wave; temperature distribution; 風洞試験; 高エンタルピー風洞; 非接触的診断; レーザ誘起蛍光; 発光分光法; 酸化窒素; 酸素原子; 衝撃波; 温度分布
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-07-005

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