The separated-reattaching flow between the two-dimensional blades is investigated experimentally and numerically In the experiment, a tandem-type probe which consists of two I-type hot-wire probes and a small elliptical cylinder is used to measure the velocity field because a separated flow involves a reverse flow which can not be measured by means of a general hot-wire probes. The experimental results show that the RMS value of the velocity fluctuation in the region of the separated shear layer approaching to the reattachment point is high and this is considered to be caused by the spatio-temporal fluctuation of the reattachment point. Further, numerical results show that the dissipation rate of the turbulent energy becomes high in the region where the Q-value and the RMS value of the velocity fluctuation are also high. These results indicate that the dissipation of the turbulent energy is caused by the separated vortex at the leading edge and the fluctuation of the reattachment point.
