Investigation on aerodynamic characteristics of flow control over high-lift low-pressure turbine blade with split

Under low Reynolds number condition boundary layer separates easily on the high lift low pressure blade's suction surface, which can lead to significant total pressure loss. In this paper,the flow control method(split) was used to control the separation on the suction surface. Different operating conditions were investigated including cascade without control, cascade with slots that generate jets with inclination angles of 30 degree, 60 degree, 90 degree separately. The present research was conducted at a Reynolds number of 75000. The results show that the separation location on the boundary layer moves downstream due to the flow control while the reattachment location moves up significantly. The results also prove that 30 degree inclination angle jet has better flow control effect than the other two structures. Compared with the no-control case, total pressure loss coefficient decreases when the inclination angle is 30 degree while increase in the other two cases.