变循环发动机高压涡轮可调导叶对涡轮级气动性能的影响

The adjustable guide vane technology of variable cycle engines is crucial for improving the performance of engines under wide operating conditions. An adjustable guide vane design was conducted on the PW-еЗ high pressure turbine. The aerodynamic performance of the turbine stage under design conditions of high pressure turbine adjustable guide vane was studied through numerical simulation methods, and the characteristics of secondary flow and shock waves in the transonic high pressure turbine cascade were systematically studied when the guide vane opening changed. The results show that adopting adjustable guide vane design for high pressure turbine can effectively meet the demand under wide operating conditions of variable cycle engines, but it will reduce the aerodynamic efficiency of the high pressure turbine by more than 1% , and the efficiency reduction is greater when the guide vanes are closed smaller than that when they are opened larger. In addition, the change in opening significantly affects the secondary flow and shock wave structure of high pressure turbines. Under - 3 ° opening condition, transonic flow begins to appear in the guide vanes, and the shock wave loss of the moving blades suddenly increases; as the guide vanes expand, the separated flow on the pressure side of the moving blades develops into a stall mass, leading to an increase in the Mach number of the moving blades. The study reveals the coupling characteristics between adjustable guide vanes of high pressure turbines and transonic flow fields, laying a theoretical foundation for the aerodynamic design and performance optimization of variable geometry high pressure turbines under wide operating conditions.