In the process of petroleum production and transportation, a porous leakage accident can easily lead to combustion behaviors such as fire merging, resulting in more severe consequences. This study explores the combustion characteristics of merging spill fires through experimental investigations, incorporating dual leakage holes with varying spacing to examine their impact on the combustion process. The experimental results suggest that the flame height undergoes a pattern of initial decrease followed by an increase with the gradual expansion of leakage spacing, owing to the coupling effects of air entrainment and thermal radiation feedback within the additional entrainment zone. Based on the developmental pattern of flames with respect to leakage spacing, this study categorizes the dual spill fire into three states: which are: (1) full merging state, (2) intermittent merging state, and (3) separation state. The flame height prediction model is established for different merging states, considering parameters such as the fuel discharge rate and the leakage spacing of dual spill fire. The experiment reveals that the flame pulsation frequency (FPF) of the spill fire follows the pattern observed in pool fire FPF, and an FPF model for dual spill fire in all states is obtained through the fitting. Finally, the coupled heat transfer between dual fire sources is considered, and a burning rate model for dual spill fire in intermittent merging states is established.

中文翻译：

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双溢流线性阵列火焰特性实验研究

在石油生产和运输过程中，多孔泄漏事故很容易引发火汇等燃烧行为，造成更为严重的后果。本研究通过实验研究探索合并泄漏火灾的燃烧特性，结合不同间距的双泄漏孔来检查它们对燃烧过程的影响。实验结果表明，由于附加夹带区内空气夹带和热辐射反馈的耦合作用，随着泄漏间距的逐渐扩大，火焰高度经历了先减小后增加的模式。根据火焰相对于泄漏间距的发展模式，本研究将双泄漏火灾分为三种状态：（1）完全合并状态，（2）间歇合并状态，（3）分离状态。考虑燃料排放速率和双溢火泄漏间距等参数，建立了不同合并状态下的火焰高度预测模型。实验表明，溢流火灾的火焰脉动频率（FPF）遵循池火FPF的规律，并通过拟合得到了双溢流火灾各状态下的FPF模型。最后，考虑双火源之间的耦合传热，建立间歇合并状态下双溢流火的燃烧速率模型。