Abstract
This paper demonstrates the use of a simple laser schlieren techniqueto obtain flow information in a two-dimensional separated compressionramp-induced shock-wave boundary-layer interaction. Tests weremade at a freestream Mach number of 9 and freestream Reynoldsnumber per unit length of 2.078 × 105 m−1.The importance of this technique in studying hypersonic flows is unique since therun times of hypersonic wind tunnels are of very short duration. The method isbased on the schlieren principle and uses a parallel sheet of a low-power (15 W)diode laser and an array of very fast response (4 ns) photodiodes. Although thearrangement detects an integral part of the signal from the fluctuating densitygradients across the span of the flow, it yields significant insights into the detailsof the flow structure. The details of the flow field are discussed usingtime-dependent fluctuating density gradient profiles, the related power spectraand autocorrelation and cross-correlation functions in the interaction region.
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