국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Development of a Flow Visualization System using Smoke in a Closed-Return Type Low-speed Wind Tunnel
저자	\|\|(Takao KIKUCHI
Keyword	flow visualization system; circulation type of low speed wind tunnel; oscillating system; flow visualization by smoke; smoke exhausting device
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr0001402.pdf?id=NALTR0001402
보고서번호	NAL TR-1402
발행년도	2000.01
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	A flow visualization system using smoke was developed in a closed- return type low speed wind tunnel. The purpose of developing this system was to investigate the unsteady flow patterns around the "NASA GA(W)-1" 2D airfoils which are oscillated in a pitching quasi-harmonic motion around axes near the leading edge and the trailing edge. The feature of this system is that both the smoke creating and smoke exhausting devices are installed in the settling chamber and at the down stream part of the test section. Consequently, it is possible to conduct long experiments without any other efforts to exhaust the smoke or any significant pollution of the tunnel walls by the smoke oil. The model driving system enables quasi-harmonic oscillation up to a frequency of 8Hz, with 3 electric motors controlled by a personal computer. It is also possible to automatically change the parameters; the mean-angles of attack, the amplitudes and the frequencies in a short time by monitoring the information on the CRT. The efficiency of experiments is highly improved as a result. The following is an outline of the visualization system ad it's performance.