Passive Control of Oblique Shock/Boundary Layer Interaction

Abstract

This paper describes an experimental comparison of three passive approaches for controlling the shock interaction with a turbulent boundary layer. The first is the application of passive cavity (PC) by use of the slots. The effects of the slot were studied by varying the number of slots from n = 2 to 8. The second is to use the vortex generators (VG). The shape of VG is a low profile triangular plow type arranged in four different types. The last method is a combination of the preceding two methods. The experiments were conducted in a 10 × 8 cm 2 supersonic blow down wind tunnel at a free stream Mach number of 2.0. The measurements made were wall static pressures, pitot profiles, and Schlieren visualizations of the flow field. It was found that in the case of PC the pressure rises in two steps and weaken the shock strength, especially for n = 8 case. For the VG arranged in coarse, the velocity profile downstream of the shock is fuller than the solid wall case. Furthermore with an appropriate combination of PC and VG, the combined method is effective in reducing the wave drag and also in suppressing the growth of the boundary layer.

Numerical Study on Transonic Flow with Local Occurrence of Non-Equilibrium Condensation

“…Thus, the method cannot be generalized as an effective method. In order to overcome the above demerits, Saida et al [3] proposed several techniques and showed that the porous wall with a cavity and vortex generator to the shock wave/boundary layer interaction was effective method to reduce the wave drag and suppress the development of the boundary layer. Further, Raghunathan [4] and O'Rourke et al [5] reported that the passive control using the porous wall with a cavity and vortex control jets upstream of porous wall might be effective control method for the shock position and pressure gradient.…”