An Experimental Study of the Structure of an Impinging Coaxial Jet: Research Initiation Award

为了减轻在这种情况下可能发生的共振效应，将研究撞击刚性表面的射流。亚音速和超音速条件都将进行实验研究。重点是同轴圆形射流，相信这种配置极有可能减少不利的压力波动。这种减少已经在自由的同轴射流中被观察到，而它们对地面的撞击以前还没有被研究过。应用于垂直起降飞机，特别是超音速飞行。

A jet impinging on a rigid surface will be studied with the aim of alleviating resonance effects which can occur in this situation. Both subsonic and supersonic conditions will be investigated experimentally. The focus is to be on co-axial circular jets, in the belief that this configuration is highly likely to provide reduction in adverse pressure fluctuations. Such reductions have been observed in free co-axial jets, and their ground impingement has not been previously explored. Application is to VSTOL aircraft, particularly to supersonic operation.