Visualization of Self-Sustained Oscillation in Impinging Jets by LIF

概要

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Feedback mechanism of self-sustained oscillation in subsonic impinging jets is studied experimentally by using a laser-induced fluorescence (LIF) technique. Phase velocities of disturbances in the flow field are obtained from a time-dependent cross-correlation function between a pressure sensor signal at a reference point and the LIF signal. A feature of disturbance propagation can be visualized by drawing maps for the cross-correlation coefficients on a plane at successive delay-times and making an animation. There are two feedback loops : one is closed by a neutral wave propagating upstream inside the jet and another is achieved by sound wave propagating outside the jet. For a nozzle with a thin rim the former is dominant, while the latter loop is enhanced by a thick rim nozzle.
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