动叶围带对鱼雷涡轮机通流性能影响研究

Effect of Rotor Shroud on Flow Passage Performance of Torpedo Turbine

针对鱼雷涡轮机叶片短小,顶部间隙泄漏损失严重的问题,基于求解雷诺平均的NAVIER-STOKES方程组,对有无围带下鱼雷涡轮机通流不同工况下流场及性能进行了数值计算,研究了有无围带时涡轮机功率、效率、燃气流量以及各种流动损失的变化规律,分析了叶轮围带对涡轮机通流流场及性能的影响。研究表明,在鱼雷涡轮机叶轮顶部上安装围带有助于消除叶轮流道主流中叶片径向的泄漏流动,减小叶轮内部流动损失,提高涡轮机通流效率和功率,改善鱼雷涡轮机通流部分的工作性能。

Aiming at the heavy flow leakage loss from rotor tip because of short blade in a torpedo turbine, a threedi- mensional, viscous and steady computational fluid dynamics （CFD） analysis is performed for studying the turbine flow field and performance of rotors with or without rotor shroud under different designing condition by solving Rans-Navier-Stokes equations. The changing trends of turbine＇s power, efficiency, gas flow rate, and various flow losses with or without rotor shroud are achieved, and the effect of rotor shroud on the flow field and the performance of turbine are analyzed. Results show that the rotor shroud can clearly enhance the power, efficiency and performance of turbine by eliminating the leakage flow and vortex at rotor tip, and by reducing the inner flow loss of torpedo turbine.