顶部开口气体流动模型
首发时间:2015-08-12
摘要:顶部开口作为一种常见的开口形式,广泛存在于船舶机舱、地下室等受限腔室中。当顶部开口腔室发生火灾时,开口处的气体交换受到压力差和密度差的共同驱动,表现出复杂的气体流动形态,从而影响腔室内火灾的生长与传播。因此,准确运用顶部开口气体流动模型,对研究顶部开口腔室火灾发展规律具有重要的意义。本文对比分析了三种顶部开口气体流动模型:压力驱动模型、浮力驱动模型和压力-浮力驱动模型,分别阐述了各种模型的物理机理和适用条件,为改进顶部开口腔室CFD模拟研究、进一步研究顶部开口腔室火灾发展规律、有效控制和扑灭火灾提供了坚实可靠的理论依据。
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A review of gas flow model through a horizontal
Abstract:Horizontal vents, which belong to a common kind of vent, widely exist in marine engine rooms, basements and other restricted chambers. When fire happens in a compartment with a horizontal vent, the gas exchange flow through the vent exhibits a complex flow pattern, under the joint effect of pressure difference and density difference. This complex flow affects the growth and propagation of fire in the compartment. Therefore, accurately using the gas flow model through a horizontal vent is of great significance to the study of the development of fire in a compartment with a horizontal vent. This paper compares and analyses three models of gas flow through a horizontal vent: pressure-driven model, buoyancy-driven model and pressure-buoyancy driven model. Physical mechanism and application condition of each model is elaborated respectively, which provides a solid and reliable theoretical basis for improvement of CFD simulation study of horizontal vents, further study of development of compartment fire and the method for effectively controling and extinguishing fire.
Keywords: compartment fire horizontal vent gas flow model
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