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由于发动机舱的火灾是典型的热驱动的浮力羽流,从探索浮力羽流的模拟方法出发,针对热羽流的基准试验,比较验证了3种基于浮力修正的2个方程湍流模型;利用pre PDF燃烧模型,模拟验证了Purdue甲烷火燃烧试验;以RR公司Trent 800发动机的1/2缩比短舱着火试验器为原型,采用RANS方法对由燃油泄漏引起的油池火进行了模拟计算,重现了短舱火灾的主要物理过程,并与试验测量的速度及温度结果进行了对比,验证了计算方法的准确性,并进一步分析了影响模拟结果的主要原因:湍流模型与燃烧模型能否准确计算近火源区域的火焰锋面状态,直接影响空气卷吸及下游火羽流的温度与速度。应用CFD技术,可以从防火设计的角度优化通风系统及短舱附件的布局。
Since the engine compartment fire is a typical heat driven buoyancy plume, based on the simulation of the buoyancy plume, three kinds of turbulence models based on the buoyancy correction are validated against the benchmark test of the thermal plume. By using pre PDF combustion model was used to simulate the Purdue methane fire test. Based on the 1/2 shrinkage nacelle fire tester of RR Trent 800 engine, the RANS method was used to simulate the oil pool fire caused by fuel leakage. The main physical process of the nacelle fire was reconstructed and compared with the results of the experimental measurement of velocity and temperature. The accuracy of the calculation method was verified and the main reason of the simulation results was further analyzed. Whether the turbulence model and the combustion model can Accurately calculate the flame front near the source region of the state, a direct impact on the air entrainment and downstream plume temperature and speed. Using CFD technology, the layout of the ventilation system and nacelle attachments can be optimized from a fire safety design perspective.