地下工程进风道气流参数通用计算模型研究

Research of All-purpose Calculating Model for Tunnel Flow Quality of Underground Project

为确定地下工程进风道对进风气流的处理能力,准确确定地下厂房通风空调工程容量,对风道内空气与壁体的换热过程进行分析,并将风道简化为等周长当量圆柱体模型;应用圆柱坐标系统,建立了地下风道气流参数通用数学计算模型,提出符合工程实际的风道入口及岩体内部远边界条件;按照离散计算的思想,采用空间、时间域交替进行、逐步推进的动态算法,建立了完整的离散计算模型,实现了对气流与风道热湿交换及参数变化的逐时动态计算。

In order to confirm the handling ability to airflow of underground tunnel, which can confirm the engineering capacity of ventilation and air conditioning of the underground factory accurately, the author analyzes the heat transfer process between air and wall in the tunnel, and simplifies the tunnel as the equivalent cylindrical model of equivalent girth. According to the system of the cylindrical coordinates, a model is established, that is the all-purpose mathematical calculating model for underground tunnel flow quality, which puts forward the tunnel entry with real project and rock condition of far border. According to the thought of separate computation, adopting the dynamic algorithm of carrying on alternately and advancing gradually in the space and the time domain, the intact dispersed calculating model is established, which realizes the hourly dynamic computation to the hot wet exchanging between air and tunnel, and the parameter variation.