タイヤモデル周りの３次元はく離流れの PIV 計測

抄録

In this research, three-dimensional separated flows around a rotating disk in uniform flow are experimentally examined to understand the flow mechanism around an automobile tire. Experiments are performed with a circular disk supported at the center of the test section of water circuit and velocity vectors around the disk are measured by using particle image velocimetry (PIV). The velocity of bulk flow is 250 mm/s and the Reynolds number based on the disk diameter is 1.25×10⁴ . Three-dimensional vector field is reconstructed from two sets of time-averaged distributions of two-dimensional vectors independently measured from two different directions. The reconstructed results successfully represent the structure of longitudinal vortex in the wake.