双竖井送排式通风方式的数值解析及运营经济性研究

以流体力学为基础,建立了公路隧道双竖井送排式通风方式的流量平衡方程和压力平衡方程。基于二分法数值求根方法，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，采用面向对象的编程语言VBA (Visual Basic for Application，以下简称VBA)编制了“双竖井送排式与射流风机组合通风方式”计算程序（以下简称通风计算程序），该程序已经在多座公路隧道的通风系统设计中得以应用，并取得了良好的效果。最后从经济风速和设备运营控制两个方面，介绍了提高运营通风经济性的策略和措施。

Study on Numerical Analysis and Service Economic Efficiency of Double-shaft Blow and Exhaust Ventilation System

 Flow conservation equation and pressure balance equation of double shaft blow and exhaust ventilation model for highway tunnels are recommended on basis of hydrodynamics in the paper. The dichotomy algorithm is adopted to extract the numerical analysis of the flow conservation equation. Furthermore, the initial trial value and constraint conditions of the algorithm are discussed. Based on the above dichotomy algorithm, a calculation program for the ventilation system consisting of double shaft blow and exhaust model integrated with jet fans has been developed by using a robust object oriented programming language called Visual Basic for Application (VBA). The calculation program has been applied in the design of the ventilation systems of several highway tunnels and satisfactory effect has been achieved. Finally, the countermeasures to improve the economic efficiency of the ventilation system are presented in respect of economic air velocity and equipment control.