铁路治沙HDPE网的数值模拟计算

Numerical Simulation Calculation of HDPE Net for Railway Sand Control

在风洞测试的基础上,对铁路治沙HDPE网进行不同模型条件下的流体动力学数值模拟计算研究。结果表明:HDPE网在开孔率为55%、平均孔目尺寸为0.98 mm×1.14 mm的物性条件下由风洞压降测试得到的数值模型内部惯性阻力系数为1 305.39、黏性阻力系数为175 298 982.9;压力跳跃模型方法和多孔介质模型方法都可用于HDPE网的数值计算,采用上述2种模型后,流场内不存在涡流区,网前的来流被分割为从网上部通过的扰流和透过网的渗透流。因此,在进行网的数值计算时,若考虑网的厚度效应,宜采用多孔介质模型方法,而若不考虑网的厚度效应,则宜采用压力跳跃模型方法。

Based on wind tunnel test, the numerical simulation calculation of fluid dynamics under different model conditions of HDPE net for railway sand control was carried out. Results show that the internal inertial drag coefficient and the viscous drag coefficient of the numerical model obtained by wind tunnel pressure drop test are 1 305.39 and 175 298 982.9 under the physical property condition that the open porosity and average pore size of HDPE net is 55% and 0.98 mm×1.14 mm respectively. Both the pressure jump model method and the porous medium model method can be used for the numerical calculation of HDPE net. After using the above two models, there is no eddy current zone in the flow field, and the incoming flow in front of the net is divided into the spoiler passing through the top of the net and the permeation penetrating through the net. Therefore, in the numerical calculation of the net, if the thickness effect of the net is considered, the porous medium model method should be adopted. If the thickness effect of the net is not considered, the pressure jump model method should be adopted.