Control of Incident Shock-Induced Separation Using Vane-Type Vortex-Generating Devices

An experimental investigation was conducted to control an incident shock-induced boundary-layer separation associated with a 14 deg shock generator in a Mach 2.05 flow. Two vane-type configurations, namely the triangular (h/delta = 0.3, 0.5, 0.8,1.0) and the rectangular (h/delta = 0.5) designs, were studied. An array of each control device was tested for three control locations of X/delta = 5, 10, and 15. The control location of 5 delta is seen to show the maximum reduction in separation length for each device tested. For the rectangular-vane device (h/delta = 0.5), a maximum reduction of 38% in separation length is observed, followed by the triangular-vane devices of h/delta = 0.8 and 1.0, each of which shows a 32% reduction, and finally, h/delta = 0.5 with 18%. The effectiveness of these devices to control separation is, however, seen to decrease with increase in XIS. In terms of separation shock unsteadiness, the maximum rms value for X/delta = 5 delta shows the highest value for each control device, and this value decreases with increase in control location. At X/delta = 15, both the rectangular vane (h/delta = 0.5) and triangular vane (h/delta = 0.8,1.0) show a 50% reduction in maximum rms value, whereas it decreases to 30% at X/delta = 10 for these devices.