Measurement on oscillatory flow at the end of the parallel-stacks using particle image velocimetry

The oscillatory ow field at the end of the parallel-stacks is visualized using Particle Image Velocimetry (PIV) measurement. The vortex shedding at the end of parallel-stacks in the engines was measured. The velocity distributions along the x-axis in the center of the channels are exhibited. The results show that the vortex influence area expands and the symmetrical vertex becomes non- symmetrical, as the increasing of the drive ratio (Dr is the ratio of the pressure amplitude and the mean pressure). The plate end shape has evident influence on the vortex configuration. The vortex is circular around the circular end and is attached close to the plate at the triangular end. This work will be favor for the understanding of interaction between the oscillatory flow and the heat transfer at the end of the stacks.