高 温 降 涡 轮 高 位 预 旋 供 气 系 统 设 计

The performance of the pre-swirl system directly restricts the cooling air quality of the turbine blades in the transition state. In this paper，the forward design of the turbine pre-swirl system is carried out by applying the theory of power-heat conversion. The aerodynamic parameters of each characteristic cross section of the system are calculated according to known boundary conditions，and the flux area of each element and its structural parameters are determined. The three-dimensional physical model is constructed through the results of the one-dimensional calculations，and the structure of high-performance pre-swirl system is obtained through rotor-stator matching iteration. The characterization and performance evaluation of the pre-swirl system with high temperature drop are conducted. The results show that the relative deviations of the bleed air mass flow rate，system temperature drop and temperature drop efficiency of the one-dimensional design calculations and numerical simulation results are less than 1. 5%，and the relative deviations of the system temperature drop from the corresponding experimental results are less than 1. 5%，pro-vided that the turbine blades supply air mass flow rate and supply air pressure requirements are met. The discharge coefficients of the pre-swirl nozzle，receiver hole and supply hole at the design point are 0. 937，0. 716 and 0. 744，re-spectively. The system temperature drop and temperature drop efficiency reach 61. 53 K and 80%，respectively，and the specific power consumption of the system is - 55. 74 kW/ （kg·s^-1）. Under the condition of ensuring the turbine blades supply air mass flow rate and the supply air pressure，the system temperature drop at the four cruise operating points reaches 39. 73–62. 88 K，and the specific power consumption reaches -55. 74–-16. 48 kW/ （kg·s^-1）.