基于CFD的管道流动局部水头损失系数的数值计算

Numerical Calculation of Local Head Loss Factor on Pipe Flow Based on CFD

本文利用FLUENT软件对几种常见模型管道在k-ε湍流情况下的流场、压力场进行了数值模拟,并根据数值模拟结果对突扩管的局部水头损失系数进行了修正。结果表明:对于突扩管在同一雷诺数下,随着管径比值(前程管径与后程管径之比D1/D2)的不断增大,局部水头损失及损失系数均减小;而随雷诺数的增大,突扩管流场中的局部水头损失系数逐渐增大。

The flow field and pressure field of several common pipelines in the case of k-e turbulence are simulated by using FLUENT software. And the local head loss factor of sudden expansion pipe has been corrected by numeri- cal calculation. The results show that the local head loss and the local head loss factor decrease gradually with the increase of ratio on pipe diameter with sudden expansion under the same Reynolds number. As Reynolds number increasing, the local head loss factor would increase gradually.