Numerical Simulation Of Synthetic Jet To Control Flow Separation Over Airfoil

The effect of synthetic jets on controlling flow separation over a NACA0015airfoil was numerically studied. The synthetic jet was located at12%c,30%c and70%c, respectively, from the leading edge (c is the chord length of the airfoil). The trends of flow separation control effect at these locations with the variation of angle of attack and jet angle was investigated. Meanwhile, the locations, phase angle and momentum coefficient of multi-location synthetic jets was investigated. In addition, the flow control mechanism of suction/blowing, synthetic jet was investigated and RANS/LES hybrid methods was utilized to study there-dimentional airfoil. The analysis based on the results of numerical simulation shows that:(1) When synthetic jets located at12%c,30%c and70%c from the leading edge, the tangential jet shows better control effect than normal jet;(2) The locations of synthetic jets should be prior to the separation point or slightly rearward to the separation point, only in this occasion can the purpose of flow control be achieved, and the best control effect can be expected when jet locations slightly rearward to the separation point.(3) The performance of multi-location synthetic jets can be improved by changing phase angle of multi-location synthetic jets.