摘要
通过现场测试结合理论分析,研究带出口匝道隧道纵向通风系统的流场动态响应特性,建立对应的通风延迟效应预测模型,分析风机开启区段、台数对延迟效应的影响规律。研究表明:相比在分流后开启风机,在分流前主线开启相同台数的风机,隧道主线稳定速度增幅较大,稳定时间也明显较快。风机开启后,在非风机开启段中响应较快的一段可能出现最大风速超过稳定风速的超调情况。超调可一定程度上缓解响应较慢的一段的滞后,加快风机开启段流速的响应速度,但超调段的稳定时间增加。
Through field test and theoretical analysis,the dynamic response characteristics of the flow field of the longitudinal ventilation system of the tunnel with off-ramp are systematically studied,the corresponding prediction model of the ventilation delay effect is established,and the influence law of the opening section and the number of fans on the delay effect is analyzed.The research shows that compared with starting the fans after the diversion and starting the same number of fans on the main line before the diversion,the stability velocity of the main line of the tunnel increases greatly and the stability time is also significantly faster.After the fan is started,the section with fast response in section with no fan start may have the overshoot of the maximum velocity exceeding the stable velocity.Overshoot can alleviate the lag of the section with slow response to a certain extent,and speed up the response speed of the flow velocity at the opening section of the fan,but the stability time of the overshoot section increases.
作者
高成博
王欣
GAO Chengbo;WANG Xin(China Railway Academy Co.,Ltd.,Chengdu 610032)
出处
《现代隧道技术》
CSCD
北大核心
2022年第S01期332-339,共8页
Modern Tunnelling Technology
关键词
城市隧道
纵向通风
出口匝道
延迟效应
理论分析
现场试验
Urban tunnel
Longitudinal ventilation
Off-ramp
Delay effect
Theoretical analysis
Field test
作者简介
高成博(1988-),男,工程师,主要从事隧道及地下工程方面的研究工作,E-mail:609425085@qq.com;通讯作者:王欣(1995-),男,硕士,主要从事隧道及地下工程环境控制方面的研究工作,E-mail:always_wx@126.com.
