抄録
In order to improve the efficiency of high-lift low pressure turbines, this paper investigates two types of airfoils which have two-dimensional contouring with a small step or dimples on the suction surface to suppress the separation bubble that causes large aerodynamic loss, especially in the case of high stage loading. A linear cascade test facility is employed to investigate the aerodynamic performance of the two-dimensional contoured airfoil by use of miniature Pitot probes and RANS simulations are carried out to investigate the three types of dimple layouts. The Reynolds number based on the chord length was varied in the range of 40,000 to 170,000 to simulate a typical flight condition. It is found that the proposed methods are capable of reducing the profile loss, resulting in an improvement of cascade performance.
