Parameter Influence on the Porous Bleed Performance with & without Shock-Boundary Layer Interaction

Abstract

Porous bleed systems are a common technique to control shock-boundary layer interactions and/or supersonic boundary layer. However, the influence of various design parameters is still unknown. Even though bleed models are required to minimize the costs of the design process, they often do not include parameter effects. In the present study, the effect of the hole diameter, the porosity level, and the length-to-diameter ratio are investigated by means of three-dimensional RANS simulations. The findings show an influence of the hole diameter on both flow control and efficiency of the porous bleed. A significant impact of the porosity level on the effective control of the shock-boundary layer interaction is found. In contrast, the length-to-diameter ratio does not influence the effective control but affects the efficiency of the system.

Porous Bleed Boundary Conditions for Supersonic Flows With & Without Shock-Boundary Layer Interaction

“…This results in a higher shock intensity. As a consequence, the thinning of the boundary layer is less effective for larger hole diameters [19].…”

“…Along the plate, the pressure increases as the boundary layer thinning is not linear, and the (c) Bleed mass flux q bl Fig. 6: Physical quantities along the porous plate flow is deflected more and more in the wall-parallel direction [19]. At the end of the bleed region, the pressure rises because of the barrier shock located downstream of the last hole.…”