基于二分法的多竖井送排式通风方式数值解析  

Numerical Solution for Multi-Shaft Blow and Exhaust Ventilation Model Based on Dichotomy Algorithm

作　　者：郑国平 朱合华[2] 

机构地区：[1]浙江省交通规划设计研究院,杭州310006 [2]上海市同济大学地下建筑与工程系,上海200092

出　　处：《地下空间与工程学报》2007年第5期837-841,共5页Chinese Journal of Underground Space and Engineering

摘　　要：多竖井送排式通风方式能将特长公路隧道划分成若干通风区段,通过竖井排出隧道内污染空气并同时送入新鲜空气,因此可以加大纵向通风方式的适用长度。多竖井送排式通风方式的流量守恒和压力平衡方程更加复杂,很难求得其解析解。以流体力学连续性原理和伯努利定理为基础,建立了多竖井送排式通风方式的流量平衡方程和压力平衡方程。基于二分法数值分析方法提出了流量平衡方程数值解的求解过程,并对迭代计算过程中目标函数的确定、初始试算值的界定、计算约束条件的选取作了介绍。以二分法为核心算法,并采用面向对象的编程语言VBA(V isual Basic forApplication,以下简称VBA)编制了"多竖井送排式与射流风机组合通风方式"计算程序,该程序已经在多个特长公路隧道通风设计中得到应用,并取得了良好的效果。Multi - shaft ventilation system divides an extra - long tunnel into several sections whose polluted air is exhausted and fresh air is provided through two neighboring shafts. As a result, a greater adaptive length for a longitudinal ventilation system can be achieved. Flow conservation equation and pressure balance equation in a multi - shaft ventilation system are so complicated that it＇ s hard to lind the analytic solution. Based on the continuity law and Bernoulli＇ s law in fluid mechanics, the flow conservation equation and the pressure balance equation of the multi - shaft ventilation model are put forward in this article. The dichotomy algorithm is adopted to extract the numerical so- lution. Besides, the object function, the initial trial value, and constraint conditions of the algorithm are discussed in the article. A software, called Multi - shaft and Jet Fan Integral Ventilation Analysis System, has been developed by using Visual Basic for Application （ VBA ）, a robust object - oriented programming language. The above given software has been applied in several extralong highway tunnels with satisfactory effect.

关 键 词：多竖井 二分法 数值解 

分 类 号：U453.5[建筑科学—桥梁与隧道工程] U455.8[交通运输工程—道路与铁道工程]