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Building Simulation 2011, 4(3): 205-216 https://doi.org/10.1007/s12273-011-0030-y
Research Article | Issue | Published: 28 March 2011

Numerical studies on evaluation of smoke control system of underground metro rail transport system in India having jet injection system: A case study

Show Author's Information Shorab Jain1,  Shashi2,  Surendra Kumar2( )
Fire Research Division, CSIR—Central Building Research Institute, Roorkee—247667, Uttarakhand, India
Department of Chemical Engineering, Indian Institute of Technology, Roorkee—247667, Uttarakhand, India
Keywords:
computational fluid dynamics, ventilation, tunnel fires, inclined ducts
Cite this article:
Jain S, Shashi, Kumar S. Numerical studies on evaluation of smoke control system of underground metro rail transport system in India having jet injection system: A case study. Building Simulation, 2011, 4(3): 205-216. https://doi.org/10.1007/s12273-011-0030-y
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Abstract Full text About this article

The rail based urban transport system is being developed for national capital of India, New Delhi. The smoke control using ventilation in case of fire inside the tunnel, similar to Delhi Metro corridor has been investigated using computational fluid dynamics technique. A section of tunnel having dimensions 400 m long, 5.5 m wide and 6 m high is considered for simulation. The analysis has been carried out by assuming a variable fire source with a peak heat release rate (HRR) of 16 MW, located at the center of the tunnel. Ventilation ducts are located in the ceiling near the tunnel portals and are inclined at 10 degrees to the plane of the ceiling through which fans discharge air. The influence of the fire HRR curve slope on the smoke flow dynamics in a realistic tunnel model fitted with jet injection type longitudinal ventilation system has been investigated. In case of fire two cases are studied: (1) fans activated immediately after detection, (2) fans activated at delayed times to take into account the response time for the fans to achieve its maximum speed. The velocity of supply and exhaust fans necessary to remove smoke in 30 s from the upstream direction is determined. The velocities of fan required to produce desired critical velocity in the longitudinal direction for different HRR of fire is predicted.


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About this article

Numerical studies on evaluation of smoke control system of underground metro rail transport system in India having jet injection system: A case study

Show Author's information Shorab Jain1,  Shashi2, Surendra Kumar2( )
Fire Research Division, CSIR—Central Building Research Institute, Roorkee—247667, Uttarakhand, India
Department of Chemical Engineering, Indian Institute of Technology, Roorkee—247667, Uttarakhand, India

Abstract

The rail based urban transport system is being developed for national capital of India, New Delhi. The smoke control using ventilation in case of fire inside the tunnel, similar to Delhi Metro corridor has been investigated using computational fluid dynamics technique. A section of tunnel having dimensions 400 m long, 5.5 m wide and 6 m high is considered for simulation. The analysis has been carried out by assuming a variable fire source with a peak heat release rate (HRR) of 16 MW, located at the center of the tunnel. Ventilation ducts are located in the ceiling near the tunnel portals and are inclined at 10 degrees to the plane of the ceiling through which fans discharge air. The influence of the fire HRR curve slope on the smoke flow dynamics in a realistic tunnel model fitted with jet injection type longitudinal ventilation system has been investigated. In case of fire two cases are studied: (1) fans activated immediately after detection, (2) fans activated at delayed times to take into account the response time for the fans to achieve its maximum speed. The velocity of supply and exhaust fans necessary to remove smoke in 30 s from the upstream direction is determined. The velocities of fan required to produce desired critical velocity in the longitudinal direction for different HRR of fire is predicted.

Keywords: computational fluid dynamics, ventilation, tunnel fires, inclined ducts

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Publication history
Copyright

Publication history

Received: 10 June 2010
Revised: 13 February 2011
Accepted: 21 February 2011
Published: 28 March 2011
Issue date: September 2011

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2011
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