Abstract
The influence of the detailed shape of the nozzle exit and the cavity inlet edge on the oscillating flow characteristics are investigated. The experiments show that the shape of the cavity edge considerably influences acoustical and thermal effects as well as the oscillatory mode (screech and regurgitant) switching. The shape of the nozzle exit edge has a minor significance. The screech oscillation mode mechanism and some details of the regurgitant mode are determined from external flow visualization and pressure measurements. Some characteristics of the near flow field induced by an oscillating jet are also obtained.
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