Influence of tripping on spatiotemporal correlation between velocity andwall pressure in a turbulent boundary layer

Abstract

In this study, investigation of tripping influence on a turbulent boundary layer was experimentally performed with five different tripping devices including classical circular rods and ’V’ shape embossment. We focused 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. Measurements were made with a single hot wire and a spanwise array of 32 MEMS microphone sensors mounted on the wall. The results indicate that the velocitypressure correlation is sensitively changed by the tripping devices, while the mean velocity profile is not affected except for very intense tripping with a thick rod. Though this tripping influence was confirmed only in the low range of Reynolds number, it warns that the transition process should be taken into account in researches on turbulent boundary layer flow.