レーザ流速計による振動翼まわりの流れの可視化

概要

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Flow visualization based on unsteady velocity information is utilized to understand directly and physically the flow structure. In this problem, the phase-average method is widely used which adjusts the fluctuating velocities in order to express them simultaneously. Prior to this, each of the velocities has been measured at their measuring points with hot-wire anemometry or laser Doppler velocimetry (LDV). However, the method has the disadvantage that velocities other than the fluctuating velocities that are being sought produce wave distortions such as FM-AM modulations. We propose a new method which uses 2 LDVs and the FFT analysis which determines the frequency, amplitude and phase of each fluctuating velocity. This method clarifies the time histories of the velocity, vorticity and velocity-energy distributions around a pitching aerofoil either with nonseparation or separation.
一般社団法人日本機械学会の論文
1995-01-25