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采用大涡模拟(LES)技术,针对某型直升机动力舱建立了火灾模型,选择油池火灾作为研究对象,并对火灾场景进行了设计.利用数值模拟的方法研究了不同位置火源动力舱的火灾场,分析了火源位置对火灾热释放速率、速度场和温度场的影响.结果表明:无通风条件下,火源位置的改变影响动力舱火灾的蔓延,并且当火源位于动力舱底部距前防火墙1/4处时,火灾强度较大,对舱内部件的破坏较为严重.因此,在防火设计中应重点对该部位火灾区域进行防范.研究结果可为动力舱灭火系统设计提供参考.
A large-eddy simulation (LES) technique was used to establish a fire model for a certain type of helicopter power cabin, choose the oil pool fire as the research object, and design the fire scene.Numerical simulation methods were used to study the effects of different location fire source cabins Fire field and analyzed the influence of the location of fire source on the heat release rate, velocity field and temperature field of fire.The results show that the change of location of fire source affects the fire propagation in non-ventilated condition, and when the fire source is located at the bottom of power cabin When the distance from the front of the firewall is one quarter, the fire intensity is large and the damage to the components in the cabin is serious, therefore, fire prevention design should focus on the fire area in the area.Research results can provide a reference for the design of the fire extinguishing system in the powerhouse .