热压与风机动力共同作用下多分支隧道内排烟气流的多解性
Multiple steady states of exhaust airflow in a multi-branch tunnel with the combined effects of buoyancy and fan power
阳东 1赵成梅2
作者信息
- 1. 重庆大学低碳绿色建筑国际联合研究中心
- 2. 三峡库区生态环境教育部重点实验室，重庆400045
- 折叠
摘要
多分支隧道的排烟与补风路径较多，热压与风机动力的竞争可能造成其通风排烟模式具有多解性。针对某一多分支隧道的防排烟工况，利用理论分析建立了各种气流模式的控制方程，通过数学方法获得了理论解。结果证明，在按照预期设计选定通风排烟模式与风机以后，多分支隧道内的排烟气流仍然可能存在多种状态，风机的运行工况点也会随之漂移，导致排烟方向可能与设计预期完全相反。研究还发现，通过改变风机选型能起到抑制排烟气流出现多解的作用。
Abstract
The multi‐branch tunnel has multiple routes for smoke extraction and air supply ,consequently its ventilation and smoke control modes could have multiple solutions owing to the competitive effects of buoyancy and fan power .For the smoke control of a multi‐branch tunnel ,the mass and energy balance equations for every possible flow pattern were established ,and the corresponding multiple solutions were obtained using mathematical methods .The results demonstrate that ,even though the exhaust ventilation mode and fan type have been determined in accordance with the anticipation ,multiple states of exhausted flow remain and the operation point of the fans will drift away from the design accordingly .This could cause a totally different direction of smoke route from the anticipated one .It is also shown that the type of fan has significant effects on the existence of multiple solutions .
关键词
多分支隧道/通风/风机性能曲线/火灾防控/多解性Key words
multi-branch tunnel/ventilation/fan performance curve/fire control/multiple steady states引用本文复制引用
基金项目
国家自然科学基金(51106189)
重庆市自然科学基金(cstc2011jjA0007)
中央高校基本科研业务费(106112013CDJZR210001)
出版年
2015
NETL
NSTL
维普
万方数据