为准确估算管线敷设与风机室内气流相互作用对压降损失的影响，基于武汉市江夏区谭鑫培路地下综合管廊项目建立典型数值分析模型与分析流程。通过建立典型管线布置的GIL舱、高压舱与综合舱的计算流体动力学三维模型，分别对入口段与稳定段进行分析，并使用循环边界条件来考虑稳定段流体的充分发展，得到阻力系数随流量的变化规律；通过建立GIL舱典型排风口三维模型，分析风机室中不同风机的压降损失，并与规范估算值进行比较。研究结果表明： 管线敷设对压降损失的影响不可忽视；风机室风机相互作用显著，规范不能准确估算该相互作用导致的压降损失。

In order to accurately estimate the influence of the interaction between pipeline laying and indoor air flow of the fan on the pressure drop loss, typical numerical analysis models and analysis workflow are established based on the underground utility tunnel project of Tanxinpei Road in Jiangxia District of Wuhan City. The inlet section and the stable section are analyzed respectively by establishing the 3D computational fluid dynamics(CFD) models of GIL cabin, highvoltage cabin and integrated cabin with typical pipeline layout, and the cyclic boundary conditions are used to consider the full development of the fluid in the stable section. The variation law of the resistance coefficient with different flow rates is obtained. The 3D model of typical exhaust vent of the GIL cabin is established, and the pressure drop losses of different fans in the fan chamber are analyzed and compared with the main normative estimates. The results show that: (1) The influence of pipeline layout on the pressure drop loss cannot be ignored. (2) The interaction of fans in the chamber is significant, and based on which the standards cannot accurately estimate the pressure drop loss.