Numerical study of effects of deflected angles of jet fans on the normal ventilation in a curved tunnel

被引：56

作者：

Wang, Feng ^{[1
]}

Wang, Mingnian ^{[2
]}

Wang, Qingyuan ^{[1
]}

机构：

[1] Sichuan Univ, Coll Architecture & Environm, Chengdu 610065, Peoples R China

[2] SW Jiaotong Univ, Sch Civil Engn, Chengdu 610031, Peoples R China

来源：

TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY | 2012年 / 31卷

关键词：

Curved tunnel; Jet fans; CFD; Deflected angle; Normal ventilation; HEAT-TRANSFER; SIMULATION; VEHICLE; PIPE;

D O I：

10.1016/j.tust.2012.04.009

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

A computational study was carried out to investigate the effects of deflected angles of jet fans, equipped with silencers, on the tunnel ventilation system. An optimal deflected angle for the normal ventilation in a curved tunnel was proposed. As the fans deflect an angle (beta) of 3 degrees towards the convex wall, maximum pressure-rise coefficient and lowest wall shear stress on the ceilings were obtained. An offset of jets on the cross-section was observed for various deflected angles (beta) initially. For beta = 3 degrees, a relatively gradual velocity profile was obtained as compared to the other values of beta which yielded steep velocity profiles downstream. The static pressure increased gradually and overlapped with each other for various values of beta initially. The divergence in the longitudinal pressure curves was found when the jets arrived at the curved walls. A relatively shorter distance was required for the pressure-rise to complete at beta = 3 degrees. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：80 / 85

页数：6

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