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Title: Transit Times in Fire Plumes and Ceiling Layers // Proceedings of the Ninth International Seminar on Fire and Explosion Hazards. Vol. 1: 21-26 April 2019, Saint Petersburg, Russia
Creators: Tamanini F.
Organization: FM Global
Imprint: Saint Petersburg, 2019
Collection: Общая коллекция
Document type: Article, report
File type: PDF
Language: English
DOI: 10.18720/SPBPU/2/k19-98
Rights: Свободный доступ из сети Интернет (чтение, печать, копирование)

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Previous work has introduced a method to infer the convective heat release rate (HRR) of a fire from the gas temperatures measured in the thermal layer near a ceiling. The modeling approach gave no consideration to the impact of flow transport on the HRR estimates obtained from measurements made at different distances from the axis of the fire plume. This omission introduces errors in the evaluation of growth rates for rapidly developing fires. The work described in the paper enhances the earlier model by implementing standard plume and ceiling layer correlations to calculate the gas travel time in the fire plume and in the ceiling layer. The estimated travel times are then used to correct the measurement time to the time of the fire. Examples are provided to demonstrate how the correction reduces the errors in fire growth rate, which are encountered when the characteristic time of the growth is of the order of or smaller than the gas travel time to the point where the temperature measurement is made. The correction has been implemented in an engineering tool, which is used internally for fire test data analyses.

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