隧道火灾中易出现双火源燃烧现象，往往造成重大人员伤亡和经济损失，因而有必要对其燃烧行为进行研究。双火源燃烧过程中，火源之间空气卷吸受限效应与辐射热反馈增强效应相互竞争,共同影响其燃烧行为，对单一火源燃烧的科学认识(机理、规律和模型)无法直接推演到双火源燃烧现象。本项目围绕火源间相互作用机理、数学演化模型和数值模拟预测的总体目标开展关键技术的研究。首先通过小尺度实验模拟，分析不同火源特征参数（燃料类型、几何尺寸和火源间距）等对双火源燃烧现象的影响规律，系统研究双火源火灾特征参数的变化规律；在此基础上，将开放空间火源阵列中火源之间相互作用机理引入到隧道火灾研究中，通过理论分析揭示隧道火灾双火源之间相互作用机理，提出隧道火灾双火源燃烧现象的数学模型；最后通过多尺度的CFD数值模拟开展验证研究。通过对双火源作用下狭长隧道火灾燃烧现象的研究，本项目将为预防多火源火灾事故提供理论依据和实验数据支撑。

Double-source burning behavior can easily occur in tunnel fires, which tends to cause heavy casualties and economic losses. Therefore, relevant research is of urgent need to be carried out. Since the competing interaction of air entrainment restriction and radiation heat feedback enhancement plays a significant role on the burning behavior of double-source fires, the analytical method and theory model for single fire cannot be directly adopted any more. In this project, the key technology research will be carried out around three overall objectives, including the fire interaction mechanisms, mathematic evolution model and numerical simulations. Firstly, through small-scale experiment simulation, the influence rules of different fire parameters (fuel type, fire size and fire spacing) on the burning behavior of double-source fires are studied, and then the change laws of fire characteristic parameters can be systematically researched. On this basis, the interaction mechanisms of double-source fires in the open space can be introduced into the research of tunnel fires. Through theoretical analysis, the interaction mechanisms of double-source tunnel fires can be revealed, and the mathematical model of its burning behavior can be put forward. Finally, the validation research can be carried out by the multi-scale numerical simulation. In conclusion, the theoretical basis and experimental data provided from this project can be used in the scientific research and accident prevention of real multi-source tunnel fires.