隧道内易燃液体泄漏而发生爆燃的事故频发，造成了大量人员伤亡与财产损失，此类爆燃受易燃液体泄漏及流淌蒸发、内部风流场作用下可燃蒸气的扩散蔓延及隧道管状边界条件约束的共同耦合作用，具有与可燃气体爆燃明显不同的特性。. 本项目拟揭示该类型爆燃的产生机理及行为特征，建立能描述上述三者与爆燃临界态及火焰传播模式间的耦合关系理论与数学模型。研究易燃液体泄漏流淌后，液气两相耦合控制形成的可燃蒸气在隧道狭长管状受限空间内的时空分布特征以及发生爆燃的临界态和关键影响参数。研究隧道内易燃液体的蒸发性能、燃烧性能以及泄漏液化量与流淌的面积及形态特征对可燃蒸气爆燃发生条件及爆燃强度的影响机制；研究可燃蒸气爆燃引起的冲击波及燃烧波与易燃液体所形成的流淌火之间的相互作用机理，以及隧道环形壁面及内部障碍物对易燃液体液气两相火焰传播的加速机理。以期获得隧道内易燃液体爆燃过程的理论模型、计算方法，为其预防与救援提供依据。

The deflagration due to the leakage of the flammable liquid in tunnel occurred frequently and caused heavy casualties and property losses. In addition, the deflagration affected by the coupled effect because of the leakage and evaporation of the flammable liquid, the diffusion of flammable vapor due to the effect of the internal airflow field, and the constraint of the tubular boundary condition of tunnel, which results in that it displays obviously different characteristic from flammable gas. . In this project, the theoretical and mathematical model of the coupling relationship between the above three factors and the critical state and the flame propagation model of deflagration aim to be built to reveal the generation mechanisms of the deflagration and the flame propagation characteristics. The critical state and influence parameters of deflagration, the time-space distribution characteristics of the flammable vapor in the arch constrained space formed by the coupling of gas and liquid after the leaking and flowing of the flammable liquid in narrow and long tunnel aim to be researched. Moreover, the influence mechanisms of the flammable vapor deflagration condition and intensity due to the evaporation capability and the combustibility of the flammable liquid and the leaking amount and the flowing area and characteristic aim to be investigated. Furthermore, the interaction mechanisms between the shock and combustion wave caused by flammable vapor explosion and the flowing fire, the acceleration action of the gas liquid two-phase flame propagation due to the arch wall of tunnel and the internal obstacle aim to be studied. Depending on the above studies, the theoretical model and the computing method of the deflagration process of the flammable liquid in tunnel aim to be obtained to provide the basis for preventing and rescuing.