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기술보고서

기술보고서 게시판 내용
타이틀	Measurement of Free-Stream Properties in the NAL 0.1m×0.1m Transonic Cryogenic Wind Tunnel
저자	Takeo AOKI, Hideo SAWADA
Keyword	cryogenic wind tunnel; measurement; yawmeter
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr01221.pdf?id=NALTR0001221
보고서번호	NAL TR-1221
발행년도	1993.12
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	Free-stream properties in the NAL 0.1m×0.1m Transonic Cryogenic Wind Tunnel were measured by using a traversing device especially designed for use in cryogenic wind tunnels.This traversing device consists of a sting-strut system,a stepping motor,a gear box,and ball bearings which can operate under cryogenic environments as cold as 93K.Various probes such as a total temperature probe,a pitot tube,a static probe,and a yawmeter (2D) can be mounted on this device.The results of free-stream measurements can be summarized as follows.Variations of total temperature and total pressure in the test section were within 1.5 K and 0.1％,respectively.The static pressure distribution data indicate that flow velocity around the tunnel center line is 0.1-0.2％ greater than that near the upper and lower walls.Measurement of flow angularity shows that the flow diverges in the test section at Mach number 0.8.The maximum difference in the flow direction is 0.62 degrees.