Mechanisms for Control of Boundary-Layer Turbulence Across the Speed Regimes.

摘要

The objective of this project is improved understanding of the response of boundary layers to surface variations for control. The subsonic studies provide a significant advancement in our understanding of boundary layer stability to small-scale roughness, which has the potential for significant drag and heat transfer reduction across all Mach numbers. The high- speed (M=5) high Reynolds number studies provide improved understanding of the response of turbulence to mechanical non-equilibrium, which led to a flow control strategy, where 25% reductions in turbulence levels were demonstrated. Our modeling suggests this could lead to a 40% reduction in surface heat transfer.