涡桨发动机动力涡轮设计研究

针对采用常规涡轮设计方法设计多恒定转速涡轮时,存在的难以兼顾不同状态点性能以及设计周期较长等问题,运用动力涡轮多设计点耦合设计方法进行研究。为了验证该方法是否有效,建立了涡轮模型并进行了3维数值模拟,在设计初始时确定了各设计点的性能。结果表明:该方法可以初步计算不同状态点下的速度三角形;在叶片造型时可以根据不同状态下的速度三角形进行优化选取进口几何构造角,使涡轮在不同状态下来流条件较好;多设计点耦合设计得到的涡轮在保证各状态下出口绝对气流角偏离轴向不大的同时各状态之间的效率均较高。

Study on Design of Power Turbine for Turboprop Engine

It is difficult to consider the performances of the different design conditions and long design cycles for studying the variable-speed power turbine by the conventional turbine design method. The power turbine was designed by the multi-point coupled design method. In order to verify its effectiveness, the turbine model was built, its three-dimensional numerical simulation was conducted, and the performance of the different design points was defined on the initial design process. The results show that the multi-point coupled design method is able to calculate velocity triangle of the different design points. According to the velocity triangle of the different design points to shaping the blades, the inlet geometrical structure angle is optimized, and the inlet condition of turbine is better. The outlet absolute flow angle of turbine designed with multi-point coupled design method has less deviation with the turbine axial, and has high efficiency in each design points.