Structure and Dynamics of Bleed-Controlled Impinging Shock/Turbulent-Boundary-Layer Interactions.
Saved in:
| Title: | Structure and Dynamics of Bleed-Controlled Impinging Shock/Turbulent-Boundary-Layer Interactions. |
|---|---|
| Authors: | Schwartz, Matthew J.1, Slater, John W.2, Gaitonde, Datta V.3 |
| Source: | AIAA Journal. Apr2025, Vol. 63 Issue 4, p1211-1227. 17p. |
| Abstract: | Porous boundary-layer bleed alleviates the detrimental effects of shock/turbulent-boundary-layer interactions (SBLIs) in high-speed vehicles. However, many underlying mechanisms through which bleed influences SBLI dynamics remain poorly understood, including unsteady separation mitigation, effects on low-frequency spectra, and turbulent kinetic energy (TKE) modulation. Proper resolution of the dynamics of these phenomena motivates the use of wall-resolved large-eddy simulations. The configuration is based on experiments at Mach 2.5 and a momentum-thickness Reynolds number of 2800, on which a shock of flow-deflection angle of 8 deg impinges. Porous bleed patches are considered with resolution of the flow structure in individual holes. Two different suction strengths are examined, denoted "half-" and "full-bleed" cases based on the sonic mass flow coefficient. Although both bleed cases localize and reduce the mean reversed flow region, only the full-bleed case successfully reduces unsteadiness, TKE, wall-pressure loading, and overall distortion due to the SBLIs. These distinctions are reflected in various local and global effects of bleed, which are examined with three-dimensional modal analysis. Among the key findings is energy shifting from the low-frequency separation behavior to a higher-frequency signature, which modulates the bleed-associated shocks and expansions. Overall, the study highlights the complex interactions between individual bleed-hole flow structures that cumulatively yield the observed overall effects, which are important in optimizing bleed systems for various design objectives. [ABSTRACT FROM AUTHOR] |
| Copyright of AIAA Journal is the property of American Institute of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
Be the first to leave a comment!
