ON INSTABILITY WAVE CONTROL IN TURBULENT JETS
摘要：
The presentation is based on two main results obtained in the framework of international projects OPENAIR and ORINOCO. Two considered effects are determined by control of large scale structures in the initial part of shear layer. In the first part we have studied experimentally how plasma actuators operating on the basis of surface barrier high frequency discharge affect jet noise characteristics [1]. An actuator's effect on the jet in the applied configuration is related to acoustic discharge excitation and to a large extent is similar to the well-known Vlasov-Ginevsky effect. Thus, the results of investigations of air jets (100-200 m/s) have demonstrated that jet excitation in the case of St ~ 0.5 using the barrier discharge plasma actuator leads to broadband amplification of jet sound radiation. The jet excitation in the case of St > 2 leads to broadband noise reduction if the action is sufficiently intensive (Fig. 1).
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