环境风作用下船舶甲板庚烷油池火下游气体温度分布特性

Characteristics of Downstream Gas Temperature Distribution of Heptane Pool Fire on Ship Deck under Crosswind

船舶甲板常处于海上有风环境,发生火灾后难以预测火灾态势的发展,将对船上人员的生命和财产安全构成巨大的威胁,因此开展有风环境下船舶甲板火灾研究十分必要。以船舶甲板上发生庚烷油池火灾为例,运用FDS数值模拟软件建立环境风作用下船舶甲板油池火模型,分析不同风速和火源功率下船舶甲板近壁面气体温度分布特性。结果表明:有风环境下,火源下游甲板近壁面气体温度分布可划分为3个阶段,并对应存在两个温升峰值点;第二温升峰值点下游气体温度随着与火源距离的增加呈现指数衰减的趋势,继而结合量纲分析,建立了无量纲温升与无量纲距离的相关关系模型。

The development of fire on ship deck in a windy environment on the sea is generally tricky to predict,which is a serious threat to the lives and properties of people on board.It is necessary to study ship deck fire in a windy environment by building a model of heptane pool fire on ship deck in wind on the basis of the Fire Dynamics Simulator.This paper analyzes the downstream longitudinal temperature distribution of the fire source with various wind speeds and fire heat release rates.The results show that under windy conditions,the temperature distribution of the gas phase near the wall on the ship deck downstream of the fire can be divided into three stages,with two corresponding temperature rise peaks.The downstream temperature of the second temperature rise peak shows an exponential decay trend with increasing distance from the pool center.The correlation between the dimensionless temperature and the dimensionless distance is established based on the dimensionless analysis.