关键词: 涡轮叶栅;薄膜冷却;气动传热;数值仿真

Abstract: Detailed numerical simulations on the three-dimensional turbulent flow and heat transfer were carried out in a turbine cascade with double row injection on the endwall upstream of leading edge. The computational domain were extended to the coolant supply plenum, and two rows of 26 film cooling holes were simulated, with about 200 cells across each orifice cross-section. RNG k-ε turbulence model was used. The three-dimensional coolant flow pathlines in the cascade and the film cooling effectiveness on the endwall were obtained. The results show that the basic flow and heat transfer patterns of endwall film cooling are well simulated, but further improvement on the accuracy of numerical simulation is needed. A new cooling concept named trajectory film cooling is presented based on the uncovered flow and heat and mass transfer mechanism of upstream leading edge endwall injection.

Key words: Turbine cascade;Film cooling;Aerodynamic heat transfer;Numerical simulation