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Erschienen in:
2010 | OriginalPaper | Buchkapitel
Receptivity Considerations for Cascaded Actuators Generating Tollmien-Schlichting Waves
verfasst von : Marcus Zengl, Ulrich Rist
Erschienen in: New Results in Numerical and Experimental Fluid Mechanics VII
Verlag: Springer Berlin Heidelberg
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Different blowing and suction profiles were analyzed for flow control experiments for a generic blowing-and-suction actuator. The aim of this actuator is to dampen Tollmien- Schlichting (TS) waves by superimposing a wave in counterphase. It is essential to dampen only designated waves without introducing other unstable modes. Therefore, the receptivity of the TS waves to the introduced disturbances is an issue. Actuator cascades of multiple actuator elements were investigated for time-periodic forcing. Design parameters and their influence on the ability to generate TS waves without triggering unwanted waves were investigated Hereby, it was assumed that the spatial velocity profile of each actuator element is uniform.