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Advisor(s)
Abstract(s)
Neste artigo é apresentado um estudo de avaliação do comportamento de um
conjunto muito significativo, de tecidos para proteção individual de segurança
de bombeiros, quando submetidos a uma fonte de calor radiante. São
apresentados ensaios experimentais desenvolvidos na Universidade de
Tsinghua (TU, China) e no Instituto Politécnico de Bragança (IPB, Portugal).
São apresentados os resultados de 84 ensaios experimentais no IPB, sendo 72
ensaios realizados para baixos níveis de fluxo de calor incidente (5 [kW/m2]) e
12 ensaios realizados para níveis médios de fluxo de calor incidente (20
kW/m2]). Estes ensaios permitiram determinar qual a melhor combinação de
proteção para diferentes conjuntos de materiais com 3 camadas (camada
exterior com 6 tecidos diferentes, barreira térmica com 4 tecidos diferentes e
camada interior com 3 tecidos diferentes). A melhor combinação foi
determinada pelo conjunto de material que apresentava menor densidade de
fluxo de calor transmitido (TB3/BT2/F1 para baixos níveis de densidade de
fluxo radiante e TB1/BT2/F1 para níveis médios de densidade de fluxo
radiante). É ainda apresentado um estudo numérico 2D, não linear transiente,
para baixos e médios níveis de densidades de fluxo de calor incidente. O
modelo numérico foi validado com os ensaios realizados na Universidade de
Tsinghua. Estes resultados permitiram concluir que existe uma relação não
linear entre o fluxo de calor incidente e o fluxo de calor transmitido, tendo em
consideração o estudo paramétrico.
This paper presents the results of a very significant number of radiant heat tests on different fabrics assemblies for individual fire safety protection. Experimental tests developed at Tsinghua University (TU, China) and at the Polytechnic Institute of Bragança (IPB, Portugal) are presented. A total of 84 experimental tests were carried out at IPB, of which 72 were performed for low incident heat flux level (5 [kW/m2]) and 12 tests for medium incident heat flux level (20 [kW/m2]). These tests allowed to determine the best combination of protection for different assemblies of materials with 3 layers (outer layer with 6 different fabrics, thermal barrier with 4 different fabrics and inner layer with 3 different fabrics). The best combination was determined by the assembly with the lowest transmitted heat flux density (TB3/BT2/F1 for low radiation level and TB1/BT2/F1 for the medium radiation level). A two-dimensional nonlinear transient numerical model for low and medium incident heat flux is also presented. The numerical model was validated with the experimental tests performed at Tsinghua University. These results led to the conclusion that there is a nonlinear relationship between the incident heat flux and the transmitted heat flux, based on the parametric study.
This paper presents the results of a very significant number of radiant heat tests on different fabrics assemblies for individual fire safety protection. Experimental tests developed at Tsinghua University (TU, China) and at the Polytechnic Institute of Bragança (IPB, Portugal) are presented. A total of 84 experimental tests were carried out at IPB, of which 72 were performed for low incident heat flux level (5 [kW/m2]) and 12 tests for medium incident heat flux level (20 [kW/m2]). These tests allowed to determine the best combination of protection for different assemblies of materials with 3 layers (outer layer with 6 different fabrics, thermal barrier with 4 different fabrics and inner layer with 3 different fabrics). The best combination was determined by the assembly with the lowest transmitted heat flux density (TB3/BT2/F1 for low radiation level and TB1/BT2/F1 for the medium radiation level). A two-dimensional nonlinear transient numerical model for low and medium incident heat flux is also presented. The numerical model was validated with the experimental tests performed at Tsinghua University. These results led to the conclusion that there is a nonlinear relationship between the incident heat flux and the transmitted heat flux, based on the parametric study.
Description
Keywords
Fogo Calor radiante Bombeiro Equipamento de proteção
Pedagogical Context
Citation
Pereira, Vitor; Piloto, Paulo A.G.; Khedouma, Nechab; Benarous, Abdallah (2019). Ensaios experimentais e simulação numérica de vestuário de proteção individual de incêndio exposto ao calor radiante = Experimental tests and numerical simulation of fire fighter clothing exposed to radiant heat. Revista FLAMMAE. ISSN 2359-4837. Nº especial, p. 107-133