立交隧道分岔部基于CFD模型的通风模拟研究  

Tunnel Bifurcation Ventilation Simulation Study Based on CFD

作　　者：陈虎成[1] 刘磊[2] 秦勇[2] 于涛[1] 

机构地区：[1]中交公路规划设计院有限公司,北京市100088 [2]中国交通建设股份有限公司,北京市100088

出　　处：《公路》2016年第3期233-236,共4页Highway

摘　　要：基于CFD流体动力学分析软件对立交隧道分岔部通风特点展开数值模拟研究,分析了"卜"形和"Y"形两种分岔部支洞在5种不同交角和7种不同风压工况下的气流场变化规律。模拟分析结果表明,角度对分岔部风速和风量的影响效果随分岔部类型不同有所差异,"卜"形分岔部交角达到30°以上时隧道内回流、涡旋等对通风不利的气流现象明显;对比发现"Y"形分岔部在各工况下的通风情况较"卜"形相对良好,受交角的影响也较小;风压对两种分岔部通风的影响趋势则相对一致。The tunnel ventilation characteristics of the ＂ 卜＂ shaped and the ＂ Y＂ shaped bifurcation are analyzed according to the CFD fluid dynamics analysis software.The variation law of bifurcated part airflow field is investigated under 5different intersecting angle and 7different wind pressure conditions.The characteristics of wind speed and air volume,airflow vector graphics and local drag coefficient are obtained according to analytical results.The influence effects of wind speed and air volume caused by the bifurcation angle are different between the two types of bifurcation.The unfavorable air flow phenomenon such as reflux and scroll are obvious when the ＂卜＂shaped bifurcation angle is over 30°.＂Y＂shaped bifurcation is in better ventilation than the ＂卜＂shaped,and the angles have minor effect on it in the meantime.The effect of wind pressure on two types of bifurcation is relatively consistent.

关 键 词：立交隧道 分岔部 通风 CFD模拟 研究 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]