Active flow control for reduction of fluctuating aerodynamic forces of a blunt trailing edge profiled body

作者：Naghib Lahouti Arash^*; Hangan Horia

来源：International Journal of Heat and Fluid Flow, 2010, 31(6): 1096-1106.

DOI：10.1016/j.ijheatfluidflow.2010.05.011

• Blunt trailing edge profiled body
• Wake instability
• Streamwise vortices
• Flow control
• Numerical simulation
• Flow visualization

Vortex shedding in the wake of two-dimensional bluff bodies is usually accompanied by three dimensional instabilities These instabilities result in streamwise and vertical vorticity components which occur at a certain spanwise wavelength The spanwise wavelength of the instabilities (lambda(z)) depends on several parameters including profile geometry and Reynolds number The objective of the present work is to study the three dimensional wake instabilities for a blunt trailing edge profiled body comprised of an elliptical leading edge and a rectangular trailing edge and to manipulate these instabilities to control the aerodynamic forces Results of numerical simulations of flow around the body at Re(d) = 400 600 and 1000 as well as planar Laser Induced Fluorescence (LIF) flow visualizations at Re(d) = 600 and 1000 are analyzed to determine the wake vorticity structure and lambda(z) Based on the findings of these analyses an active flow control mechanism for attenuation of the fluctuating aerodynamic forces on the body is proposed The flow control mechanism is comprised of a series of trailing edge injection ports distributed across the span with a spacing equal to lambda(z) Injection of a secondary flow leads to amplification of the three dimensional instabilities and disorganization of the von Karman vortex street Numerical simulations indicate that the flow control mechanism can attenuate the fluctuating aerodynamic forces at lower Reynolds numbers (Re(d) = 400

• 出版日期2010-12