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.

In this paper, several existing porous bleed models are implemented into the in-house RANS-solver elsA, and their performance are evaluated on two different flow cases. Reference simulations are performed to evaluate the accuracy of the applied bleed models and to show the lack of modeling different plate geometries. The models significantly differ in predicting the bleed mass flux along the plate. For the turbulent supersonic boundary layer bleeding, the reference simulations demonstrate a hole diameter influence on the flow, but none of the models considers this effect. The model of Slater fits well with the reference simulation by applying it to its extracted data. However, applying the bleed models as a boundary condition results in more significant deviations from the reference simulation, leading to an overestimation of the wall shear stress and fuller boundary layer profiles downstream of the bleed region. Additionally, in the second flow case, including the shock-boundary layer interaction, the effect of the porous bleed is overestimated. No model is found suitable for a shock-boundary layer interaction control, and essential parameters such as the bleed hole diameter are not considered.

In this paper, several existing porous bleed models are implemented intothe in-house RANS-solver elsA, and their performance are evaluated ontwo different flow cases. Reference simulations are performed to evalu-ate the accuracy of the applied bleed models and to show the lack ofmodeling different plate geometries. The models significantly differ inpredicting the bleed mass flux along the plate. For the turbulent super-sonic boundary layer bleeding, the reference simulations demonstrate ahole diameter influence on the flow, but none of the models considersthis effect. The model of Slater fits well with the reference simulationby applying it to its extracted data. However, applying the bleed mod-els as a boundary condition results in more significant deviations fromthe reference simulation, leading to an overestimation of the wall shearstress and fuller boundary layer profiles downstream of the bleed region.Additionally, in the second flow case, including the shock-boundary layerinteraction, the effect of the porous bleed is overestimated. No modelis found suitable for a shock-boundary layer interaction control, andessential parameters such as the bleed hole diameter are not considered.