Effects of Incidence Angle on the Three-Dimensional Flow and Aerodynamic Loss Downstream of a High-Turning Turbine Rotor Blade

입사각이 고선회 터빈 동익 하류에서의 3차원 유동 및 압력손실에 미치는 영향

The effect of incidence angle on the three-dimensional flow and aerodynamic loss in the downstream region of a high-turning turbine rotor blade has been investigated with a straight miniature five-hole probe. The incidence angle is changed to be +10, +5, 0, -10, -20, -30 and -40 degrees. The results show that the positive incidence reinforces the three-dimensional vortical flows within the turbine passage including the passage vortex, but the negative incidence weaken them significantly. A small increment in the positive incidence angle results in a remarkable aerodynamic loss increase, while increasing the incidence angle in the negative range leads to a very small change in the aerodynamic loss.