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INFLUENCE OF TRIPPING ON SPATIOTEMPORAL CORRELATION BETWEEN VELOCITY AND WALL PRESSURE IN A TURBULENT BOUNDARY LAYER

Yasuyuki Sendai
Department of mechanical systems engineering Shinshu University 4-17-1 Wakasato, Nagano, Japan

Masaharu Matsubara
Dept. of Mech. Eng., Shinshu Univ. Wakasato 4-17-1, Nagano 380-8553, Japan

Аннотация

The aim of this study is to investigate tripping influence on not only basic statistics such as mean velocity and fluctuation profiles, but also spatiotemporal correlation between the wall pressure and the streamwise velocity fluctuations. In wall-bounded turbulent shear flows, measurements of instantaneous flow fields at the near wall position are restricted by the exists of the wall, though the turbulence production mainly occurs there. The wall pressure and its distribution were focused as an obtainable quantity including rich information related to the turbulence production. Measurements are performed in a flat plate turbulent boundary layer using a hot wire and a spanwise array of 32 MEMS microphone sensors mounted on the wall. The comparison was performed at the same Reynolds number based on the momentum thickness of the boundary layer. The cross-correlation between the streamwise velocity and the wall pressure fluctuations are not affected by the alteration of the tripping devices. On the other hand, its invariable distribution suggests the cross-correlation can be utilized for detecting structure of disturbance in turbulent shear flows.