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摘要
This article experimentally investigates the self-excited impinging planar jet flow, specifically the development and propagation of large-scale coherent flow structures convecting between the nozzle lip and the downstream impingement surface. The investigation uses phase-locked particle image velocimetry measurements and a new structure-tracking scheme to measure convection velocity and characterize the impingement mechanism near the plate, in order to develop a new feedback model that can be used to predict the oscillation frequency as a function of flow velocity (U-o), impingement distance (x(o)) and nozzle thickness (h). The resulting model prediction shows a good agreement with experimental tone frequency data.
- 出版日期2014-5
