Investigation of effects of slat trailing edge jet on multi-element airfoils flowfield

Effect of jet applied to the leading edge slat on the flowfield for multi-element airfoils were investigated to improve the high-lift aerodynamic performance of multi-element airfoils. The influences of key parameters, such as the jet flow rate and the speed of jet on the leading edge slat were studied. CFD method was adopted to analyze the effect of jet on the aerodynamic performance and the shear layer development behind the gap between slat and main element. Two dimensional unsteady Reynolds-averaged Navier-Stokes equations was solved by finite volume method to obtain two dimensional unsteady flowfield of multi-element airfoils. The results indicated that the slat trailing edge jet flow has significant effect on the pressure coefficient of each section of the multi-element airfoils and the maximum lift coefficient simultaneously. The maximum lift coefficient, the total maximum lift coefficient of main element, and the lift coefficients of slat and flap would increase with the jet momentum coefficient increases.