旋回のある放射状超音速流れ中の擬似衝撃波

抄録

Static and dynamic properties of the pseudo-shock in radial supersonic flow with swirl between two parallel plates were experimentally investigated. The length and pressure recovery of the pseudo-shock were smaller than those in the straight channel. Pressure recovery decreased with increase of swirl. Pressure fluctuation at two different points along the radius were simultaneously measured and were statistically corelated, so that the mechanism of the propagation of pressure fluctuation was to be analyzed. There were two main fluctuations with high and low frequencies, each of which propagated in opposite direction. The former was excited by the oscillation of the air column in the exhaust chamber and propagated upstream as the pressure wave, while the latter was due to the oscillation of the first shock and was convected downstream.