Direct numerical simulations of a supersonic turbulent boundary layer subject to velocity-temperature coupled control
Qiang Liu, Zhenbing Luo, Guohua Tu, Xiong Deng, Pan Cheng, Panfeng Zhang
Abstract
A velocity-temperature coupled control method is proposed for turbulence drag reduction of supersonic boundary layers. Direct numerical simulations indicate that heated wall blowing achieves the best drag reduction, whereas cooled wall blowing leads to a drag increase. The reduction of mean viscous shear stress is mainly responsible for the drag reduction mechanism, though there is a substantial increase in Reynolds stresses. Nevertheless, the control efficiency of heated wall blowing is low due to high energy consumption, but further investigation is needed.
Topics & Concepts
DragMechanicsSupersonic speedBoundary layerTurbulenceDirect numerical simulationParasitic dragDrag coefficientDrag divergence Mach numberMaterials scienceFlow control (data)Reynolds stressShear stressAerodynamic dragBoundary layer suctionReynolds numberFlow separationBoundary layer controlPhysicsEngineeringTelecommunicationsFluid Dynamics and Turbulent FlowsComputational Fluid Dynamics and AerodynamicsAerodynamics and Acoustics in Jet Flows