摘要
横掠管束模型抽象于水利工程中的绕流柱体群或换热器中的绕流管束。引用周期性边界条件将模型简化,通过数值模拟技术考察了不同雷诺数下的流场和温度场。经过比较发现随着Re数的增大,流动由稳态转变为出现较大的涡,接着涡变小,随后又变大这样的一个循环过程。这是由于随着Re数的增大,惯性力、粘性力与不断生成的微小漩涡三者的共同作用导致。换热过程与流动密切相关。此外,研究了监测点处速度随时间的变化趋势。结果表明:流动呈现出非线性特性,随着Re数的增大,数值解从稳态过渡到周期性振荡最后发展为混沌的状态。
The model of cross-flow tube bundle channel look like column body of surrounding flow in wa-ter conservancy project or tubes of surrounding flow in heat exchange .The paper introduced periodic boundary condition to simplify model ,and investigated flow field and temperature field in different values of Re by numerical simulation .It is discovered that with the increase of Re number,flow changes from sta-ble to the appearance of bigger vortex ,then becomes smaller and then grow bigger ,which is a circulation process.The reason is that with the increase of Re number,the inertial force, viscous force and micro vor-tex of continuous generation combine action .The process of heat transfer are closely related to flow .In addition , the change trend of the speed at monitoring point with time is investigated , it is found that the flow exhibits nonlinear properties .With the increase of Re number, the numerical solution from steady state to periodic oscillation and finally develop into a state of chaos .
出处
《水资源与水工程学报》
2014年第3期29-33,共5页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(51306121)
国家自然科学基金项目(51276118)
国家自然科学基金海外合作基金项目(51129602)
关键词
横掠管束
流场
温度场
周期性边界条件
非线性特性
bundle corss-flow tube
flow field
temperature field
periodic boundary condition
nonlinear characteristics
