摘要
报导了三峡混流式机组模型蜗壳内紊流的三维数值分析结果。文中基于Ｎ－Ｓ方程和标准的ｋ－ε紊流模型，采用贴体座标和交错网格系统，用ＳＩＭＰＬＥＣ算法对蜗壳内部的流动进行数值模拟，提出设计工况时蜗壳内部的紊流特性。数值分析结果表明：在设计工况，蜗壳内部的流动符合速度矩为常数的设计理论。文中提出的数值方法，可用于改进和优化蜗壳设计，从而提高水轮机的效率，改善水轮机的性能。
? The spiral casing is an important through flow part of a hydraulic turbine. Its internal flow has significant influence upon the hydraulic efficiency and performance of the turbine. Based on the solution of Navier Stokes equations and the standard k ε turbulent model, the numerical simulation on internal flows through the spiral casing of a model hydraulic turbine applied for the Sanxia (Three Gorge) hydro power project has been carried out by using the body fitted coordinates, the staggered grid system and the SIMPLEC algorithm in the present work. The numerical analysis results show that under the design operating condition, the spiral internal flow agrees with the design theory which the multiplication of radius and circular velocity fraction is constant. The numerical method presented in this paper can be used to optimize the spiral design to improve the efficiency and performance of hydraulic turbine.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1997年第8期95-98,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金项目,59493700
