The use of impulse ventilation for smoke control in underground car parks

Abstract Impulse ventilation systems (IVS) are used to provide ventilation for covered car parks and to control the smoke in the event of fire. In this paper the interaction between the fire ceiling jet and the flow driven by jet fans is studied using CFD simulations. A sensitivity analysis considering important parameters as position and intensity of fire source, transversal distance between jet fans, restriction of exhaust flow rate and dimension of car park exhaust opening is carried out and rules for the design of 50 N thrust jet fans are deduced. An analytical model for the flow field near the ceiling is developed and compared with CFD simulations. This model is intended to support a first approach of the design of IVS.

[1]  Suhas V. Patankar,et al.  CFD MODEL FOR JET FAN VENTILATION SYSTEMS , 2000 .

[2]  Chen Xiaojun,et al.  Simulation of temperature and smoke distribution of a tunnel fire based on modifications of multi-layer zone model , 2008 .

[3]  Wan Ki Chow,et al.  Numerical studies on performance evaluation of tunnel ventilation safety systems , 2003 .

[4]  C. K. Chan,et al.  Numerical simulations on fire spread and smoke movement in an underground car park , 2007 .

[5]  Domingos Xavier Filomeno Carlos Viegas.  Uma Técnica de Erosão Aplicada ao Estudo da Interacção de Jactos Turbulentos com uma Superfície Plana , 1982 .

[6]  Hiroomi Satoh,et al.  Fire properties in near field of square fire source with longitudinal ventilation in tunnels , 2003 .

[7]  João Carlos Viegas,et al.  The Use of Impulse Ventilation to Control Pollution in Underground Car Parks , 2009 .

[8]  Tony Lemaire,et al.  Large Scale Fire Tests in the Second Benelux Tunnel , 2006 .

[9]  R. Blevins.  Applied Fluid Dynamics Handbook , 1984 .

[10]  Wan Ki Chow.  On safety systems for underground car parks , 1998 .

[11]  Leonard Y. Cooper.  Fire-Plume-Generated Ceiling Jet Characteristics and Convective Heat Transfer to Ceiling and Wall Surfaces in a Two-Layer Fire Environment: Uniform Temperature Geiling and Walls , 1991 .

[12]  R. L. Alpert.  Calculation of response time of ceiling-mounted fire detectors , 1972 .

[13]  Leander Noordijk,et al.  Modelling of Fire Spread in Car Parks , 2005 .

[14]  Alan N. Beard,et al.  Fire Size and Fire Spread in Tunnels with Longitudinal Ventilation Systems , 2005 .

[15]  Hong Sun Ryou,et al.  A numerical study on smoke movement in longitudinal ventilation tunnel fires for different aspect ratio , 2006 .

[16]  Kevin B. McGrattan,et al.  Fire dynamics simulator (ver-sion 3) technical reference guide , 2001 .

[17]  Michael A. Delichatsios,et al.  The initial convective flow in fire , 1979 .

[18]  J. Hinze,et al.  Transfer of heat and matter in the turbulent mixing zone of an axially symmetrical jet , 1949 .