Experimental and Numerical Investigation of Porous Bleed Control for Supersonic/Subsonic Flows, and Shock-Wave/Boundary-Layer Interactions

TL;DR

This study combines experimental and numerical methods to analyze porous bleed systems for boundary layer control in supersonic and subsonic flows, demonstrating their effectiveness and providing insights into flow behavior and shock interaction management.

Contribution

It offers a comprehensive validation of porous bleed control effectiveness across flow regimes and highlights the importance of flow topology characterization for improved modeling.

Findings

Porous bleed effectively controls boundary layers in supersonic flows.

Experimental evidence of three-dimensional effects and spanwise boundary-layer variations.

Reynolds-Averaged Navier-Stokes simulations accurately predict shock-wave/boundary-layer interactions.

Abstract

This paper presents a comprehensive experimental and numerical investigation into the control of boundary layers using porous bleed systems. The study focuses on both supersonic and subsonic flow regimes, as well as on the control of shock-wave/boundary-layer interactions. By simplifying this complex problem into two separate scenarios, the research establishes the necessity of individually characterizing bleed systems for both supersonic and subsonic flow regimes due to variations in the flow topology within the bleed holes. In supersonic conditions, a strong agreement between experimental and numerical results validates the effectiveness of porous bleed in controlling boundary layers. Notably, three-dimensional effects are experimentally demonstrated, and variations of the boundary-layer profiles along the span are the first time experimentally proven. The study extends its scope to subsonic flows, revealing that while boundary-layer bleeding enhances flow momentum near the wall, mass removal induces a decrease in momentum in the outer boundary layer and external flow. The research also explores shock-wave/boundary-layer interaction control, achieving a remarkable alignment between simulations and experiments. The findings endorse the use of Reynolds-Averaged Navier-Stokes simulations for studying porous bleed systems in various flow conditions, providing valuable insights to enhance bleed models, especially in the context of shock-wave/boundary-layer interaction control.