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|標題:||Wavelet analysis on lock-on of cavity flows with hysteresis||作者:||Kuo, C.H.
|關鍵字:||self-sustained oscillations;reynolds-number;shear-layer;transforms;cylinders;plate;wall||Project:||Fluid Dynamics Research||期刊/報告no：:||Fluid Dynamics Research, Volume 42, Issue 4.||摘要:||
The present study reveals the potential of investigating the lock-on characteristics of a cavity shear layer with hysteretic character using wavelet analysis. The velocity fluctuation is measured by the laser Doppler anemometry system. The rectangular cavity has a length-to-depth ratio (L/D) of 3, in which hysteretic character occurs for incoming velocities ranging from 10 to 20 cm s(-1). A small cylinder is situated very close to the upstream corner of the cavity to generate periodic excitations at various frequencies in the form of rotary oscillation about its center. The amplitude of tangential velocity is kept constant. The results analyzed by Fourier and wavelet transformations are compared. It is found that, for cavity flows with hysteresis, the frequency bandwidth of the lock-on region lies between the low and high frequencies of the two oscillation modes, and this frequency bandwidth of the lock-on regions is better defined by using wavelet analysis.
|Appears in Collections:||機械工程學系所|
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