Spatial distribution characteristics of self-excited oscillations in a grille-cavity flow&nbsp; field based on TR-PIV method

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (23) : 234-240.

Spatial distribution characteristics of self-excited oscillations in a grille-cavity flow field based on TR-PIV method

ZHANG Yongchang1, XU Yugong2

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Abstract

Grille-cavity flow can cause flow field self-excited oscillations to lead to various engineering problems.Here,wind tunnel tests were used to investigate spatial distribution characteristics of flow field oscillations.A grille-cavity test device was built.Using the time-resolved particle image velocity (TR-PIV) measurement system,velocity fields of the cavity’s sections in different spread directions were measured.The time-frequency characteristics of velocity oscillations at the specific positions of flow flied were analyzed.The results showed that in grille-cavity flow,the flow field self-excited oscillation frequencies are uniformly distributed in space and their Strouhal number is about 0.37; on the outside of the grille,the oscillation amplitudes have a variation of increase-decrease-increase in flow direction; on the inside of the grille,the oscillation amplitudes increase firstly and then decrease; the oscillation amplitudes are symmetrically distributed along the spread direction to reach the maximum on the spread bisector plane,and the minimum on the cavity’s wall surface.

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grille-cavity flow / self-excited oscillation / TR-PIV / spatial distribution

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ZHANG Yongchang1, XU Yugong2. Spatial distribution characteristics of self-excited oscillations in a grille-cavity flow field based on TR-PIV method[J]. Journal of Vibration and Shock, 2018, 37(23): 234-240

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