幂律流体突扩管道湍流流动的研究

Turbulent Flow of Power Law Fluid in Sudden Expand Channel

考虑幂律流体的本构关系 ,结合流动指数的影响 ,建立了适用于幂律流体的N S动量方程和湍流模型方程 ;采用SIMPLE算法 ,对不同流动指数的幂律流体突扩管道湍流流动进行了数值计算 ,计算结果和实验数据吻合较好 .对计算结果进行分析后发现 ,对于不同流动指数的幂律流体 ,其湍流变化趋势不同 ,从而揭示了流动指数对幂律流体突扩管道湍流流动有重要影响 .

A power law turbulent fluid model is studied. Using a semi-implicit method for pressure-linked equations (SIMPLE), the numerical computations for the turbulent flow in sudden expand channel are made. The simulation results show that the changing flow tendency of power law turbulent fluid varies with the different flow exponent, which means that the flow exponent has an important influence on turbulent flow. The simulation yields good results when compared with experiments.