不同容积容器内喷气燃料燃爆特性研究

Study on jet fuel explosion characteristics in different volume containers

为提高喷气燃料的安全储存、运输及使用水平,通过试验研究不同质量浓度喷气燃料在不同容积容器内发生燃烧爆炸时,压力、压力上升速率、温度及火焰传播速度的变化特征,利用计算流体力学(CFD)软件模拟喷气燃料火焰结构变化过程,分析容器容积及燃料质量浓度对燃爆特性的影响。结果表明:密闭空间内,喷气燃料发生燃爆后各参数均随质量浓度增大先上升后下降,最大爆炸危害的燃料质量浓度为104.17 g/m^(3);同时,喷气燃料燃爆产生的压力处处相等,且在等比例容器中,当化学当量比接近1时,喷气燃料最大火焰传播速度、最大压力基本不受容器容积影响,但喷气燃料燃爆造成的最大平均升压速率与容器尺寸呈反比关系;相同时间内,空间越大内部温度越高。

In order to provide theoretical support for the safe storage,transportation and use level of jet fuel,the variation characteristics of explosion pressure,pressure rise rate,temperature and flame propagation velocity of jet fuel with different mass concentrations in different volume pressure containers were studied experimentally,and the change process of flame structure of jet fuel was simulated by CFD(Computational Fluid Dynamics)explosion simulation software.The effects of container volume and fuel mass concentration on the combustion and explosion characteristics were analyzed.The results show that in the confined space,the explosion parameters of jet fuel first increase and then decrease with the increase of mass concentration,and the fuel mass concentration of the maximum explosion hazard is 104.17 g/m ^(3).At the same time,the pressure generated by the detonation of jet fuel is equal everywhere,and in an equal proportion containers,when the chemical equivalence ratio is close to 1,the maximum flame propagation speed and maximum deflagration pressure of jet fuel are basically not affected by the container volume,but the maximum average pressure rise rate caused by the detonation of jet fuel is inversely proportional to the container size.In the same time,the larger the detonation space,the higher the internal temperature.