沿海地区综合管廊综合舱通风除湿数值模拟

Numerical Simulation of Ventilation and Dehumidification of Integrated Compartment in Utility Tunnel in Coastal Area

基于沿海地区综合管廊内部湿度较大,对管线及支架造成不利影响的现象,以平潭综合管廊工程为依托,采用计算流体力学软件Fluent建立三维数值模型。模拟综合舱通风过程,分析通风对流下的速度场分布及温、湿度场变化情况。研究表明:通风作用下,温、湿度较快发生变化的位置出现在速度较大的地方;距进风口100～180 m处的各截面温、湿度场在变化过程中存在分层现象,应重点关注下层区域的温、湿度指标;通风是有效的除湿手段,但随着通风距离的增大,通风除湿效果呈减弱趋势,通风分区不宜过长。研究对综合管廊的通风实际运营管理有一定的实际应用价值。

The air humidity,inside the utility tunnel in the coastal is high which could negatively impact the pipelines and the brackets. Relying on the design of the ventilation system of the Pingtan Utility Tunnel project,the computational fluid dynamics software Fluent is used to establish a 3 D numerical model to simulate the ventilation process of the integrated compartment,and to analyze the velocity field distribution and the temperature and humidity field transformation under ventilation convection. The research shows that the position where the temperature and humidity change rapidly appears in the place with high speed under ventilation. The temperature and humidity fields of each section from 100 m to 180 m from the air inlet are stratified during the change process. The temperature and humidity indicators of the lower area need to be concerned. Ventilation is an effective means of dehumidification. However,as the ventilation length increases,the dehumidification effect gradually decreases. The length should not be too long. The study has practical value on the actual operations management of the utility tunnel ventilation.