Control of Trailing Edge Separation with the Use of Circular Endwall Slot in a Highly Loaded Turbine Blade Cascade

The blade endwall slot was employed to effectively regulate boundary layer separation on the suction side and optimize the fluid properties following the blade's trailing edge. This investigation aims to determine the reason for trailing edge separation and how it may be suppressed using the converging blade endwall slot, with a focus on higher-turning stator blades. The circular blade endwall slot provides 20, 50, and 70% of the axial chord for evaluating endwall loss. The computational results are generated using the endwall slot blade and then compared to the datum blade and got a 5% reduction in both total pressure loss, vorticity magnitude, and 10% in turbulence kinetic energy. The findings reveal that the slot created at the endwall by adjusting the axial cords provides a self-adaptive jet that re-energizes and controls the low-velocity fluid downstream and regulates its movement towards midspan. Thus, trailing edge separation at a corner is eliminated, which enhances the fluid properties after trailing edge of the blade, improving the turbine's performance significantly.