基于FDS的风扇舱双油池火温度变化特征  

Temperature variation characteristics of double fuel-pool fire in fan cavity based on software FDS

作　　者：程关兵[1,2] 叶豪辉 CHENG Guanbing;YE Haohui(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China;Key Laboratory of Civil Aviation Thermal Hazards Prevention and Emergency Response,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学航空工程学院,天津300300 [2]中国民航大学民航热灾害防控与应急重点实验室,天津300300

出　　处：《中国安全科学学报》2024年第1期133-139,共7页China Safety Science Journal

基　　金：民航热灾害防控与应急重点实验室开放基金资助(RZH2020-KF-06)。

摘　　要：航空发动机燃油泄漏形成的油池火威胁发动机运行和飞机安全,为描述风扇舱内油池火复杂的物理传播过程,开展双油池火温度变化特征的研究。首先,基于火灾动力学模拟软件(FDS)建立CFM56-7B发动机风扇舱物理计算模型;然后,比较Trent 800发动机风扇舱单油池火温度计算值与试验值,验证网格独立性;最后,借助探测器和切片分析舱内双油池火的发展过程和温度变化特征。结果表明:双油池火温度在舱内环向上经历增加和振荡准稳态2个变化阶段,其变化幅度与探测器和油池的间距相关;油池火向左偏斜现象导致左半边温度较高;火焰在轴向上经历火羽流上浮、火焰开始融合、融合扩大和完全融合等阶段。Pool fire caused by fuel leakage seriously threatens engine operation and aircraft safety.To deeply understand the complicated physical mechanisms of pool fire in engine fan cavities,temperature variation characteristics of double fuel pool fire were investigated.Firstly,the physical and numerical models of the CFM56-7B engine fan cavity were established based on the software FDS.Secondly,simulated temperature variations of single fuel pool fire were validated against measurements of the Trent 800 engine fan cavity,and then grid independence was analyzed.Finally,the fire development process and temperature variation characteristics of double fuel pools were analyzed within the fan cavity using several detectors and slices.The results indicated two phases for temperature variation of the double fuel-pool fire in the engine cavity,including an increment state and a quasi-steady state.Moreover,temperature variation magnitude was affected by distances between the detectors and the fuel pools.Fuel-pool fire flame propagation inclined to the left side of the fan cavity,causing an increment of fire temperature on the left side.Plume floating,flame fusion,fusion expansion,and full flame coalescences were observed in the axial direction of the cavity.

关 键 词：火灾动力学模拟(FDS) 风扇舱 双油池火 温度变化特征 发动机 

分 类 号：X949[环境科学与工程—安全科学]