内插转子的管内流动数值模拟与分析  

Numerical Simulation and Analysis of Flow in Circular Tube With Rotors Insert

作　　者：朱晓磊[1] 孟继安[1] 李志信[1] 

机构地区：[1]热科学与动力工程教育部重点实验室、清华大学航天航空学院,北京100084

出　　处：《工程热物理学报》2013年第6期1123-1126,共4页Journal of Engineering Thermophysics

基　　金：国家科技支撑项目(No.2011BAA04B02);973项目(No.2013CB2283001)

摘　　要：采用MRF模型和力矩平衡法数值模拟了内插转子的管内流动,比较了内插叶片型转子和直线型转子后的速度场、流阻及其机械能耗散。结果表明,固液接触面积过大和转子转速过快是导致内插叶片型转子阻力增加较大的主要原因。与叶片型转子相比,直线型转子的特殊结构使固液接触面积减小、转速降低,因此,流阻的增幅显著减小。同时转子的转动可增强壁面处的扰动,增大壁面处流体速度梯度,使其具有一定的强化换热和除垢抑垢能力。Based on the MRF model and moment balance method,the fluid flow in circular tube inserted with blade helical rotors and straight-line rotors was simulated.The flow fields,flow resistances and the mechanical energy dissipations of the fluid flow were obtained and compared.The results show that the large increment of flow resistance with blade helical rotor inserts is mainly resulted from the larger solid-liquid contact area and the faster rotor rotating speed.Compared to the blade helical rotor,the straight-line rotor has much smaller solid-liquid contact area and rotating speed due to its special structure,the increment of flow resistance by straight-line rotor inserts can be markedly reduced,and the rotors can also enhance the flow disturbance and increase the velocity gradient near the tube wall,it is of the ability of heat transfer enhancement and fouling removal and anti-fouling.

关 键 词：叶片型转子 直线型转子 机械能耗散 流动阻力 

分 类 号：TK264[动力工程及工程热物理—动力机械及工程]