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应用雷诺应力模型对轴流式水轮机轮缘间隙的三维紊流流动进行了雷诺平均N-S方程的数值计算与分析。对转轮直径为340 mm的5叶片轴流式水轮机在轮缘间隙为0 mm、0.25 mm、0.5 mm、1 mm时分别进行了分析计算,分析了轴流式水轮机轮缘间隙对叶片压力分布、速度矢量、数值效率和间隙漏水量的影响,研究了轴流式水轮机轮缘间隙内流动规律,提出了轴流式水轮机轮缘间隙对轴流式水轮机优化设计的重要性。实例表明,用三维紊流数值模拟方法研究轴流式水轮机轮缘间隙是改进和优化轴流式水轮机设计的一个重要过程。
The Reynolds-averaged N-S equation is numerically calculated and analyzed using the Reynolds stress model for three-dimensional turbulent flow in the flange gap of an axial-flow turbine. The 5-blade axial-flow turbine with 340 mm rotor diameter was analyzed and calculated when the clearance between the flanges was 0 mm, 0.25 mm, 0.5 mm and 1 mm respectively. The influence of the gap between the flanges of the axial-flow turbine on the blade pressure distribution , Velocity vector, numerical efficiency and the amount of water leakage in the axial flow turbine, the law of the flow in the gap of the axial-flow turbine is studied and the importance of the flange gap of the axial turbine to the optimal design of the axial-flow turbine is proposed. The example shows that the three-dimensional turbulence numerical simulation method of axial flow turbine rim clearance is an important process to improve and optimize the design of axial-flow turbine.