Aerodynamic Analysis of Blade Bowing Design in an Integrated Inter-turbine Duct
A numerical simulation was carried out to improve the performance of a counter-rotating turbine and study the influence of blade-bowing design based on an integrated inter-turbine duct(IITD). The struct and aero vanes were bowing designed,the bowing blade height was controlled at 50％ constant. Positive bowing,reverse bowing,J type bowing and reverse J type bowing were designed and the blade bowing angle was varied from 10° to 20° in this study. Through a comparative analysis of schemes with various bowing laws,the mechanism of controlling the secondary flow and reducing loss was initially discussed. The results show that the main loss area in IITD is concentered at the suction-endwall corner of the struct and aero vanes. The J type bowing design effectively improves the pressure distribution on the blade surface,significantly reduces the high loss area and optimizes the mainstream flow. The J type bowing design with 20° bowing angle reduces the energy loss coefficient in IITD by 7.4％,relatively,which significantly improves the control of secondary flow in the IITD flow field.
Integrated Inter-turbine Duct(IITD)Structural VaneAero VaneJ Type Bowing BladeSecondary FlowAerodynamic Performance
万方数据
维普
