| Citation: | CHEN Z L，LU Z X，XIAO T H，et al. Effect of local oscillation on aerodynamics of thin airfoil in Mars environment[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（11）：2938-2950 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0032
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The thin atmosphere of Mars constrains the MAV in the subcritical Reynolds number regime, where the laminar boundary layer separation extremely adversely affects the aerodynamic performance of UAVs. Meanwhile, the low sound velocity of the Martian atmosphere results in a higher Mach number of UAVs, which enhances the compression effect and may generate shock waves. The numerical approach based on the dynamic mesh is used to model the unsteady flow field and examine the flow control effect of the airfoil local oscillation with the atmospheric characteristics of Mars. The NACA5605 thin airfoil is selected, the Reynolds number is 1.5×104, and the Mach number is 0.43 and 0.63. The airfoil local oscillation can greatly reduce the size of the separation zone, increasing lift and decreasing drag, according to the results of the time-averaged flow field and time-averaged aerodynamic coefficient. The unsteady flow field shows that the flow control mechanism is that the vortex motion generated by oscillation restrains the laminar flow separation near the trailing edge of the airfoil. The flow control efficiency under different amplitudes, frequencies, and oscillation locations is studied. Under the optimal parameters, the lift-to-drag ratio is improved up to 24.7% at 0.43 Mach number while 52% at 0.63 Mach number.
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