Flow characteristics in boundary layer bleed slots with plenum

Abstract

Numerical simulations were conducted to investigate the performance characteristics of bleed through normal slots and its effect on the turbulent boundary layer development under zero and strong adverse pressure gradient caused by incident oblique shock. The solution to the compressible Navier-Stokes and k-e equations was obtained in a domain that includes the regions inside the bleed slot and plenum in addition to the external flow. The computational results demonstrate the interactions between the plenum, and bleed flow and the effect of incident shock on the boundary layer development downstream.The computed results agree with the experimentally measured pitot and static pressure distribution inside the slot. The bleed mass flow without incident shock was underpredicted over the range of plenum pressures.The computations predicted the measured increase in bleed mass flow with incident shock.

Improvements in Modeling 90-degree Bleed Holes for Supersonic Inlets

“…A tangential component of velocity may be significant, but is not modeled (Ref. 27). Furthermore, for certain bleed rates, the bleed can impose a roughness onto the flow that may be important for turbulence quantities of the turbulence models (Ref.…”

Hybrid LES/RANS Simulation of the Effects of Boundary Layer Control Devices Using Immersed Boundary Methods

“…The design of active or passive bleed systems for high-speed inlets is an area in which experimentation and empirical correlations have played a dominant role. [3,4] Most efforts in simulation of boundary layer bleed for separation control have concentrated on single slot or hole effects [11][12][13][14]. With the exception of a few three-dimensional studies involving resolution of individual holes using overset-grid techniques [13,14], most studies have assumed twodimensional flow, and all have utilized Reynolds-averaged Navier-Stokes (RANS) models or simpler strategies.…”

A quasi one-dimensional bleed flow rate model for terminal normal shock stability in mixed compression supersonic inlet

“…Up to now, a great number of experiments and numerical simulations have been performed to predict the bleed flow rate from slots that are near to not only the terminal normal shock but also to oblique shocks. Hamed et al [6][7][8][9][10] studied the interaction between an oblique shock and a laminar/turbulent boundary layer with various normal and slanted bleed slots. Dambara et al 11 proposed a model of boundary conditions when a turbulent boundary layer is being bled.…”