Numerical Study on the 3-D Flow of Airfoil-Flat Plate Combination with Gap

Flow through object phenomena is very important subject in aerodynamics. This phenomenon gave more information towards fluid flow characteristics and its form formation. The evidence oftwo dimensional history flows was strongly influenced three dimensional flow characteristics. The complexity of 3-D flow around airfoil-flat plate combination with gap has attracted many researches. Twotypes of airfoil (symmetrical and non-symmetrical) and variation of gap thickness clearance be used through the study. Inlet velocity of 25m/s as initial condition while air density and viscosity is constant being used. Through pressure coefficient contour, several things being analyze such as pressure coefficient of the airfoil-flat plate, pressure distribution at the wall, pressure difference between upper and lower side of airfoil-flat plate, pressure gradient and where the saddle point form. Fromthe result, it can see that symmetrical airfoil-flat plate have same pressure distribution between upper and lower side of airfoil-flat plate while for non-symmetrical airfoil-flat plate, the lower side pose higher pressure distribution compared to the upper side of the airfoil-flat plate. This cause pressure difference and strongeradverse pressure gradienthappen at non-symmetrical airfoil-flat plateeven at angle of attack 0°. Saddle point is formed further away in front of leading edge and tends to move on pressure side below for non-symmetrical airfoil-flat plate. The effects of gap become clearer with using non-symmetrical airfoil-flat plate when the emergence oftip gap vortex especially near the rear tip towards the wall