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摘要: 基于求解雷诺平均的NAVIER-STOKES方程组，对水下航行体涡轮机通流部分的流场及性能进行了数值模拟，研究了设计工况与非设计工况下涡轮机内部流场精细结构和流动损失，分析了非设计工况涡轮机效率的影响因素。研究表明，设计工况下喷管处于超临界状态，造成叶轮中很强的入口激波，引起叶轮壁面边界层的分离；存在叶尖径向间隙泄漏和轴向间隙泄漏，由此造成很大的间隙泄漏损失；非设计工况下，涡轮机出口背压升高，涡轮机效率下降明显，喷管环效率下降是主要原因；本文所使用的CFD模型及计算方法能够较好地捕捉水下航行体涡轮机内部存在的各种复杂流动结构，所预测的涡轮机性能与试验数据吻合良好。Abstract: A three-dimensional, viscous, steady CFD analysis is performed to investigate turbine flow field and performance of underwater vehicle by solving RANS-Navier-Stocks equations and RNG turbulence model. The flow detail and loss in turbine are studied for on-design and off-design conditions. The effect factor on turbine efficiency under off-design condition is analyzed. The results show that shock wave and flow separation occur in turbine under on-design condition, flow losses are caused by clearance flow in turbine. The turbine performance is degraded rapidly due to higher flow loss in nozzle as the back pressure increases under off-design condition. The predicted turbine efficiency agrees well with the test data.
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Key words:
- underwater vehicle /
- turbine /
- numerical simulation /
- off-design condition
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