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A platform for research: civil engineering, architecture and urbanism
Experimental investigation and CFD simulation of organic peroxide pool fires (TBPB and TBPEH)
Pool fires of liquid organic peroxides show fundamentally very different characterstics e.g. generally much higher mass burning rates, large flame lengths as well as high irradiances in comparison to liquid hydrocarbon pool fires. Such peroxides present a potential risk during storage and transportation. In order to measure, calculate and develop effective methods of protection and safety distances experimental studies and CFD simulations of TBPB (tert -butyl peroxybenzoate) and TBPEH (tert-butyl peroxy-2-ethylhexanoate) pool fires were performed. The experimental investigations led to the observation that low heat of vaporisation and readily available oxygen atoms from the thermal decomposition in the combustion zone accelerate the combustion. Therefore, very high mass burning rates were measured. Due to this fast burning, fuel Froude numbers increase significantly which finally enlarges the visibility of luminous flame. As a consequence the irradiance and surface emissive power of flames were also enhanced significantly. Probably due to discontinuous decomposition and vaporisation of TBPB an extraordinary self sustained pulsating effect (W-Effect) was observed. CFD simulation is capable to predict the mass burning rate and flame lengths of TBPB and TBPEH which are qualitatively close to the measured values. CFD Simulation estimated the safety distances accurately when predicted time averaged flame surface temperature is used. An improvement of combustion model employed in the present simulation probably will lead to a better estimation of flame characteristics.
Experimental investigation and CFD simulation of organic peroxide pool fires (TBPB and TBPEH)
Pool fires of liquid organic peroxides show fundamentally very different characterstics e.g. generally much higher mass burning rates, large flame lengths as well as high irradiances in comparison to liquid hydrocarbon pool fires. Such peroxides present a potential risk during storage and transportation. In order to measure, calculate and develop effective methods of protection and safety distances experimental studies and CFD simulations of TBPB (tert -butyl peroxybenzoate) and TBPEH (tert-butyl peroxy-2-ethylhexanoate) pool fires were performed. The experimental investigations led to the observation that low heat of vaporisation and readily available oxygen atoms from the thermal decomposition in the combustion zone accelerate the combustion. Therefore, very high mass burning rates were measured. Due to this fast burning, fuel Froude numbers increase significantly which finally enlarges the visibility of luminous flame. As a consequence the irradiance and surface emissive power of flames were also enhanced significantly. Probably due to discontinuous decomposition and vaporisation of TBPB an extraordinary self sustained pulsating effect (W-Effect) was observed. CFD simulation is capable to predict the mass burning rate and flame lengths of TBPB and TBPEH which are qualitatively close to the measured values. CFD Simulation estimated the safety distances accurately when predicted time averaged flame surface temperature is used. An improvement of combustion model employed in the present simulation probably will lead to a better estimation of flame characteristics.
Experimental investigation and CFD simulation of organic peroxide pool fires (TBPB and TBPEH)
Experimentelle Untersuchung und Simulation der Flüssigkeitsdynamik beim Flächenbrand organischer Peroxide (TBPB und TBPEH)
Kirti Bhushan Mishra (author)
BAM-Dissertationsreihe ; 63 ; 1-130
2010
146 Seiten, 66 Bilder, 14 Tabellen, 107 Quellen
(nicht paginiert), 1-130
Theses
English
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