Characterization of the Suction and Oscillatory Blowing Actuator in Still Air

摘要

The current study focuses on dynamic characterization of the Suction andrnOscillatory Blowing (SaOB) actuator in still fluid as a pre-requisite to closed-looprnflow control application. This stage should shed light on operational aspects, suchrnas, the unsteady actuation characteristics, and the structure of the external,rnhighly unsteady and complex flow. These aspects are studied through a series ofrnexperiments with a variety of experimental methods including unsteady pressuresrnmeasurements, hot-wire anemometry, phase-locked and time resolved particlernimage velocimetry (PLPIV and TRPIV, respectively). Here we compare twornTRPIV data reduction methods. We use proper orthogonal decomposition (POD)rnto filter the data (through small number of most energetic modes) and identifyrnthe most energetic coherent structures in the flow field. The current resultsrnshould enable development of simplified boundary conditions for CFD. Thernsuction effect, as well as the interaction of the actuation with a cross-flowrnboundary layer are under current study.