Unsteady PSP Measurement in Low-Speed Flow - Overview of Recent Advancement at Tohoku University

Recent activities on PSP applications to unsteady low-speed flow at Tohoku University are reported. One significant achievement is the determination of the frequency response of PSP using an acoustic resonance tube. This apparatus can produce sinusoidal pressure variations in the frequency range from 0.1 to 10 kHz. The amplitude and the phase delay characteristics of Polymer-Ceramic PSP were measured and it was found that PC-PSP had the time response of at least 3.8 kHz. For unsteady low-speed measurements, two new types of image processing techniques have been developed; one is the modified phase-lock method and the other the conditional image sampling method. The frequency-domain technique based on pixel-by-pixel FFT analysis has also been implemented. These techniques were applied to measure unsteady pressure fields around a 3D square cylinder caused by Karman vortex shedding. It has been demonstrated that pressure fluctuation images with the peak frequency of 150 Hz and the pressure amplitude of several hundred Pa can be measured using PSP.

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