180°方形截面弯管内流动特性研究

Research on Inner Flow Characteristics of 180° Elbow Pipes with Square Section

针对180°方形截面弯管内复杂的流动特性以及出现二次流现象等问题,运用Fluent软件对连续方程和纳维-斯托克斯方程进行空间离散,对180°方形截面弯管内的流动进行数值模拟计算。模拟计算结果与实验测量的结果基本相一致,说明建立的数学模型与数值方法是有效的。同时,分析了弯管内二次流形成与发展的现象,得出了二次流的变化规律。这为揭示180°方形弯管内复杂流动现象的作用机理提供了参考,对于机械设备的制造和应用具有一定的意义。

Aiming at the complex flow characteristics and the secondary flow phenomenon in 180~ elbow pipe with square section, the Fluent software was adopted to implement spatial dispersion of continuous equation and Navier-Stokes equation and to simulate and calculate turbulent flow in this 180° elbow pipe. The simula- tion result shows that this calculation result coincides with the experimental result; and it indicates that both established mathematical model and numerical method are effective; meanwhile, the formation and develop- ment of the secondary flow within the elbow pipe were analyzed to obtain the change rules of this secondary flow so as to provide the reference for revealing the mechanism of complex flow in the 180° elbow pipe with square section, and it has a certain significance for both manufacturing and application of mechanical equip- ment.