流道几何参数对低压导向器气动性能的影响

采用数值计算方法对某型低压导向器原型和改型进行了数值模拟，导向器的子午流道具有一个较长的机匣且过渡段且机匣段具有较大外壁扩张角，气流易在此处分离恶化导向器叶栅进口流动。数值研究表明：机匣外壁和叶型的优化设计改善了导向器的气动性能，在计算域初始条件相同的情况下，导向器能量损失显著降低。

The Impact of Flow-passage Geometric Parameters on the Aerodynamic Performance of a Low-pressure Guide Vane Assembly

By using a numerical calculation method a numerical simulation was conducted of a prototype and modified low-pressure guide vane assembly. The meridian flow passage of the latter has a relatively long casing transition section with the casing assuming a rather great outer-wall divergence angle. Gas flow is liable to separate at the outer wall, resulting in a deterioration of the cascade inlet flow of the guide vane assembly. The results of the numerical study indicate that the optimized design of the casing outer wall profile and blade contour has improved the overall aerodynamic performance of the guide vane assembly. In the case of identical calculation-domain initial conditions there is a marked reduction of outlet energy loss of the guide vane assembly.