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Mathematical Problems in Engineering
Volume 2014, Article ID 194125, 9 pages
Research Article

Numerical Study on Different Series Modes of Jet Fan in a Longitudinal Tunnel Ventilation System

School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu 610500, China

Received 26 May 2014; Revised 21 August 2014; Accepted 4 September 2014; Published 29 September 2014

Academic Editor: Jaromir Horacek

Copyright © 2014 Guihong Pei and Jie Pan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Efficient ventilation systems will contribute to maintaining air quality in the tunnel. In order to improve ventilation performance in normal traffic condition, the 3D tunnel models were established according to the original design for the tunnel located in central plains of China. Based on the commercial CFD software Fluent 6.3 and - turbulence model, numerical simulations were carried out to study the patterns of jet flow and the optimization of fan combinations. It is found that the axial velocity profile obtained from numerical simulation agrees quite well with turbulent free jet theory although there is a little difference on the magnitude. The comparison of four combination modes under the condition of operating four fans indicates that the ventilation effectiveness is affected mainly by both the interval of adjacent groups of fans and the combination modes of operational fans. According to the simulation results, a novel combination mode which consists of a group double paralleled fans and two groups single fan is designed. The novel combination mode is regarded as the optimum combination mode with respect to maximizing air velocity in the tunnel. Compared to the traditional combination modes, it will increase the air velocity by 5.7%.