Abstract
As for transonic compressor cascades, the movement of shock waves in the flow passage affects the aerodynamic characteristics, that is, cascade flutter characteristics, because it introduces large pressure fluctuations on the blade surfaces. Therefore, it is necessary to clarify the characteristics of shock wave movement in the flow field. However, there are few studies about the characteristics of shock wave movement in the transonic compressor cascade oscillating in the pitching mode. To make sure the characteristics of shock wave movement in the flow passage of transonic compressor cascade, we constructed a high-speed photographing system combined with a Shlieren optical unit. The photographing concept is based on the fact that the shock wave movement following the blade oscillation is periodic. From the pictures taken with this system, the characteristics of shock wave movement in the flow passages of the transonic linear compressor cascade are analyzed in the range from 0Hz to 300Hz of one blade oscillation frequency.
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