후연 형상에 따른 평판익 유동특성

초록

A numerical investigation has been carried out to assess the effect of beveling near the trailing edge of a stationary flat-plate blade. Two different shapes near the trailing edge, namely the pressure surface cutting (TP) and the suction surface cutting (TS), have been analyzed. The incompressible, Reynolds averaged Navier-Stokes equations have been solved in conjunction with the k-ω model as a turbulence closure. Steady calculation is performed for three different angles of attack in both the cases. The flow field in both the cases is found to be different. Comparatively stronger wake region is observed in TS case and the flow recovery is slow in this case. Also, a large recirculation region behind the trailing edge is found in this case. The size of the recirculation behind the trailing edge has close relation to the shape of beveling of the trailing edge. The pressure drops sharply near the beveling point in case of TP while a smooth variation of pressure is observed in TS case. The velocity gets accelerated near the beveling point in case of TP. Lift and drag coefficients are comparatively higher for TS.