국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Spectroscopic Analysis of NO Band Emissions from Arc-heated Air Flows in a 750kW Arc-Heated Wind Tunnel
저자	Yasuo WATANABE, Kiyomichi ISHIDA, Hiroyuki SHIRAI
Keyword	Arc-jet wind tunnel; emission spectroscopy; NO bands
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr0001417.pdf?id=NALTR0001417
보고서번호	NAL TR-1417
발행년도	2000.12
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	Spectroscopic measurements of arc-heated high enthalpy air free streams were carried out in a 750 kW arc-heated wind tunnel. A 50cm Acton SpectraPro 500i spectrograph with Princeton Instrument 576G-1 ICCD detector was used to obtain emission spectra in the wavelength range from 190nm to 900nm. Major spectral features identified were the vibrational bands of NO g,d and e band systems in the UV region. All the vibrational bands observed show only an upper vibrational level of v'=0. The NO bands were analyzed and synthetic spectra built based on the detailed energy level structure of NO and spectral line profile. The extent of agreement between synthetic and high resolution experimental spectra was examined to determine rotational temperatures, using a spectral profile matching method. Vibrational temperatures could not be determined by experiment due to the lack of vibrational bands with v'>0. Examining problems such as the lack of b band system and v'>0 bands of other band systems and, unexpectedly weak intensities of the e band system would be of use in clarifying details of nonequilibrium energy transfer mechanisms in the flow.