Flow characteristics through porous bleed in supersonic turbulent boundary layers

Numerical simulations are conducted to characterize the flow for porous bleed in supersonic flow. Numerical solutions of the compressible Navier-Stokes equations are obtained in a domain that includes the bleed passages and plenum in addition to the external flow. The three-dimensional flow details within the bleed holes are presented and compared for single and multiple staggered bleed-hole arrangements. The results indicate that the flow within the bleed holes contain supersonic jets with embedded shocks along the bleed-hole back side and large separated flow regions in the front that grow with increased plenum pressures. The flow within the individual holes is shown to be influenced by the relative hole location in multiple-hole arrangements in addition to free-stream and plenum conditions. The computed results are compared to existing experimental data for the bleed sonic flow coefficient. The calculated boundary layer profiles downstream of the bleed region are compared to those obtained from two dimensional flow simulations with newly implemented bleed boundary condition in the Wind-US code are compared to those obtained in the fully resolved solution within the multiple bleed holes and plenum.

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