Abstract

Unsteady shock wave buffet phenomenon is often induced on the upper surface of supercritical airfoils. An OAT15A airfoil at Mach number of 0.73 and angle of attack of 3.5 degrees is numerically predicted. IDDES method is used with dissipation-adaptive functions introduced into high-order TVD methods. Conventional URANS predictions are unable to effectively predict the buffet phenomenon while IDDES successfully captured buffet phenomenon. Periodical oscillations of shock waves in the streamwise direction and strong shear layers are captured and plenty of small scale structures broken down by the shear layer instability and in the wake are predicted. The distribution of pressure coefficients and starting point of shock wave oscillation reasonably match experimental data. Then, two vortex generators (VG) in one span of 0.26 chord length are mounted in front of the shock wave region to suppress buffet. VGs significantly suppressed the RMS level of pressure in the buffet region and the averaged shock wave position is obviously pushed downstream.

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