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이두열(Du-Yeol Lee),강창식(Chang-Sik Kang),신유환(You-Hwan Shin),김광호(Kwang-Ho Kim) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
In this study, the instability of a centrifugal compressor with vaned diffuser was investigated. During unstable operation of the test compressor, pressure fluctuations at different diffuser radius ratios were measured by using high frequency pressure transducers. Two different types of stall, mild and deep stall, were observed alternately and irregularly at some flow rate where the compressor performance was steeply deteriorated. In this transient zone, the size of rotating stall cell was estimated through the Wavelet transform analysis. It was about 45 percents of rotor circumferential space at 3000 rpm and not dependent on flow rate.
PIV를 이용한 바탕회전하에서 회전요동하는 직사각형 용기 내의 유동해석
서용권,최윤환,김성균,이두열,Suh, Yong-Kweon,Choi, Yoon-Hwan,Kim, Sung-Kyun,Lee, Du-Yeol 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.6
In this paper, we show the numerical and the experimental results of two-dimensional fluid motions inside a rectangular container subjected to a background rotation added by a rotational oscillation. In the PlY experiment we apply a new algorithm, new three step search(NTSS), to the velocity calculation. In the numerical computation, the linear Ekman-pumping model was used to take the bottom friction effect into account. It was found that it well produces the experimental results at low e number.