流体横掠管束模拟中壁面函数影响研究

Study of the Influence of Wall Surface Functions in Simulating a Fluid Laterally Sweeping a Tube Bundle

采用标准k-ε湍流模型和增强壁面函数法对管壳式换热器进行数值模拟,模拟结果与实验结果吻合较好。对于匀速来流的理想横掠管束模型,考察标准壁面函数和增强壁面函数两种壁面处理方法对壁面修正的影响;同经典公式相比较,雷诺数Re为5000时采用标准壁面函数计算结果误差较大,而增强壁面处理模拟结果误差较小;Re为15000时,两种壁面函数计算结果吻合都较好。采用增强壁面函数计算时,y+值对计算结果准确性有较大的影响,且增强壁面函数能够较好地考察近壁面的传热和流动特性。

The standard k-ε turbulent flow model and an enhanced wall surface function method were used to numerically simulate a shell-and-tube heat exchanger.The simulation results are in relatively good agreement with the test ones.By employing an ideal laterally-swept tube bundle model for an incoming stream at a uniform speed,investigated was the influence of the two wall surface treatment methods on the wall surface correction,i.e.the method based on the standard wall surface function and enhanced one.Compared w...