Abstract
In the present study, the effect of aspect ratio (length-to-depth ratio) on the pressure oscillation induced by a rectangular cavity over which the gas flows at a supersonic speed is investigated experimentally. The temporal variations in pressure are measured with the semiconductor-type pressure transducer on the wall changing the aspect ratio of the cavity and the power spectral densities are calculated for each aspect ratio. As a result, it is found that the transition between the transverse and longitudinal oscillations occurs between the aspect ratios 〜1 and 〜2.
