Traveling Instability Waves in a Mach 8 Flow over an Elliptic Cone

Simultaneous measurements were carried out with three hot-film probes in the Mach 8 flow over an elliptic cone of 2:1 aspect ratio, and the data obtained were compared to the results of computations using the parabolized Navier-Stokes equations and linear stability theory. The elliptic-cone flow was found to be significantly different from the flows studied in previous hypersonic-flow stability experiments, which have focused exclusively on wind-tunnel models with two-dimensional, planar or axial symmetry. At least two instability mechanisms appear to be active in the present flow: one associated with the region of maximum crossflow in the vicinity of the shoulder of the cone and the other associated with the inflectional velocity profiles on the top centerline. Between the shoulder and leading edge of the cone, the dominant flow instability occurred at relatively low frequency, and the direction of the phase velocity was significantly skewed from that of the boundary-layer-edge streamlines. The results were found to be in rough agreement with linear stability calculations and are suggestive of a traveling crossflow instability mode, which apparently has not heen observed before in hypersonic flow

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