Experimental study of a pulsating flow in a rectangular channel

To study the aerodynamics of a pulsating flow in a flat channel of 20×150×600 mm, an experimental setup has been constructed. Gas flow pulsations were generated by rotating a damper that completely blocked the channel. The damper was located behind the test section, and the setup operated in the regime of sucking air from the surrounding space. These studies were carried out using the PIV method, synchronizing the measuring system with the damper rotation angle. The experiments were carried out at pulsation frequency F = 8 Hz. The experimental results are directly compared with the case of a steady flow with a fixed damper, but with the same rotation angle as in the case of phase averaging. It has been established that under these conditions, superimposed flow pulsations weakly affect the longitudinal velocity profiles, integral characteristics of the wall layer and friction coefficient, which indicates a quasi-steady flow in the channel.