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Abstract
The influence of the artificial perturbation on the turbulent separating flow in the two-dimensional asymmetric diffuser is experimentally investigated. The perturbation is accomplished by periodically alternating the flow suction and injection through a spanwise slit on the diffuser wall. The improvement of pressure recovery performance and the reduction of the separation zone is significant, but only within the optimum frequency range. The measurements of ensemble-averaged velocity distribution has indicated the organized oscillatory fluid motion in the optimum frequency range, that is considered to be responsible to the enhancement of momentum transport across the diffuser and hence the reduction of separation length.
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