摘要
以商用 CFD 软件 FLUENT 为工具,采用 RNG κ-ε湍流模型和湍流应力模型,对旋转直通道内气流流场进行了三维粘性数值模拟。在与文献的试验结果对比后,表明本文算法具有良好的准确性。本文分析了两种湍流模型在模拟旋转直通道气流流场的差别,同时分析了旋转直通管道在转速一定,流量改变的情况下其气流流场的变化规律。计算结果表明:RSM 模型比 RNG 模型能更好地模拟湍流驱动二次流;随着流量的减少,截面内的二次流减弱,主流高速区从压力而转移到吸力面。本文的分析为提高水泵、风机等旋转机械的性能和效率提供了依据。
Based on CFD software FLUENT, RNG k-ε and RSM turbulence model are adopted to simulate the viscous flow-field in rotating rectangular ducts. Comparison between the present calculation results and the datum from available literature is made. The results of this paper get well agreement with the experiment datum. The difference between the two turbulence models is analyzed when simulating the flow-field. The change rule of flow-field at the constant rotating speed and variable flux is studied in present paper. It is found that RSM turbulence model is better than RNG model when utilized to capture the turbulence-driven secondary motions. With the flux decreasing, the intensity of the secondary flow is weaken, and mainstream velocity peak is moved to the suction side from pressure side. Performance and efficiency of the rotating mechanism can be improved according to the study of this paper.
出处
《建筑热能通风空调》
2005年第5期98-101,共4页
Building Energy & Environment
