A numerical simulation of a high-pressure and low-pressure turbine was carried on to investigate the influence of different stagger angles of the high-pressure guide vanes. The aerodynamic performances (isentropic efficiency of the HPT and LPT, mass flow rate at the inlet, the degree of reaction, total pressure loss coefficient and the flow angel) are analyzed in details to reveal the effect of the guide vanes with different stagger angles. The results indicate that: the mass flow rate can be effectively controlled by changes of the stagger angle of the HPT guide vanes and the distribution of the enthalpy drop in each stage is regulated as well. The efficiency of the turbine increases to some extent when the guide vanes open for 5 degree but it degrades sharply while the guide vanes close. The stagger changes of the HPT guide vanes can also influence the performance and flow field of the LPT.%使用CFD软件对某发动机高低压涡轮,通过调节高压涡轮导叶安装角度改变喉道面积,对安装角变化前后涡轮的性能及其流场的变化进行了数值模拟.详细分析了当高压涡轮导叶几何可调时,高、低压涡轮等熵效率、进口流量、反力度、出口总压损失系数、进出口气流角的变化规律.结果表明,通过调节高压涡轮导叶安装角,可有效控制涡轮进口流量,有效调节焓降在级间的分配.高压涡轮导叶打开或关闭,打开5.时效率有一定的提高,关闭时效率下降十分严重.高压涡轮导叶可调将对低压涡轮性能和流场造成一定的影响.
展开▼
