Instability Wave Control by Plasma Actuators: Problems and Prospects
摘要：
Instability waves are considered as an important part of radiating turbulence. They dominate in the mechanism of noise generation for supersonic jet but they could be important for high-speed hot subsonic jets as well. An investigation conducted in the paper shows that instability waves can have supersonic phase speeds for hot subsonic jets even in the presence of co-flow. The paper deals with the idea of instability wave control in turbulent jets. This idea is related with two problems: (i) design of the actuation system that can generate the instability wave with the required properties, and (ii) development of an instability wave control strategy based on identification of the instability wave signature in the initial jet region near the nozzle exit. To demonstrate the possibility of flow object control, we showed the possibility to destroy large scale vorticies in tone forced jet by low amplitude plasma microjet disturbances which, however, have a special azimutal/frequency structure. Lost of the actuator's effectiveness when it is inserted into a flow, or located close to the other is discussed. Theoretical analysis shows that it is always possible to exert a control action completely suppressing the instability wave, on condition that the instability wave is detected, and that there exist the most efficient configurations of control action for instability wave control. It is also demonstrated that robust formulas could be derived in such a way as to allow the characteristics of the control action to be determined from the two-point measurements in the near field by straightforward calculations with the use of a known transfer function.
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会议名称：
49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
会议时间：
2011
被引量：
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