【摘要】 蜗壳是水轮机的一个重要过流部件,蜗壳内部三维流动的研究对改善水轮机性能有重要意义。随着计算技术和计算机的飞速发展,应用数值模拟技术研究蜗壳内部流场已成为改进和优化蜗壳设计的一个重要手段。本文应用雷诺平均NS方程和非结构化网格对不完全蜗壳进行了三维CFD流动分析,研究了支墩形状对蜗壳内部的速度、压力分布、蜗壳出口角以及蜗壳效率等性能的影响,并根据流动分析结果对不完全蜗壳进行了优化设计。更多还原

【Abstract】 The spiral case is an important component of the water turbine.Study of three dimensional flow through the spiral case is of great benefit to improve the performance of the turbine.With the rapid development of computational method and computer,the numerical analysis of flow field within the spiral case is a main tool to optimize the spiral case.Based on the Reynolds averaged N S equations and the non structural grid,CFD analysis of three dimensional flow through a semi spiral case is presented in the paper.The effect of the piers on the distribution of velocity and pressure in the spiral case,outlet angle and efficiency of the spiral case is studied.According to the result of flow analysis.optimum design for semi spiral case is carried out.更多还原