The continuously spilling -butanol fire is systematically investigated in steady flow state. The influence of thermal conductivity of substrate on spilling fire is revealed. According to the temperature distribution and spreading characteristics, the spilling fire over concurrent steady flow -butanol is separated into the heat transfer dominant stage in low-discharge rate and the forced flow dominant stage in high-discharge rate with the critical discharge rate = 141.5 ml/min. The low-discharge rate spilling fire spread depends on the coupled effects of subsurface flow preheating and intrinsic dragging of flowing fuel, whereas the high-discharge rate spilling fire depends mainly on the dragging effect of non-slip boundary condition on the liquid surface. The temperature distribution of liquid surface proves that the behavior of thermal fluid diffusion occurs in high-discharge rate. The velocity of spilling fire decreases with an increase in thermal conductivity of substrate. The magnitudes of heat transfer involving spilling fire spread over -butanol inside the subsurface flow namely gas conduction, liquid conduction, liquid convection, sensible heat and heat dissipation from substrate and walls of spilling trench are quantitatively calculated. The sum of sensible heat and convective heat loss accounts for more than 80% of total heat flux.

中文翻译：

---

正丁醇燃料稳定流动时溢出火蔓延的传热分析


对稳态流动状态下连续溢出的正丁醇火灾进行了系统研究。揭示了基材导热系数对溢出火灾的影响。根据温度分布和蔓延特征，将并流稳流正丁醇溢流火灾分为低流量下的传热主导阶段和高流量下的强制流主导阶段，临界流量=141.5ml /分钟低排量溢出火灾蔓延取决于地下流预热和流动燃料固有拖曳的耦合作用，而高排量溢出火灾主要取决于液面非滑移边界条件的拖曳作用。液体表面的温度分布证明了热流体扩散行为在高放电率下发生。随着基材热导率的增加，溢出火焰的速度降低。定量计算了溢流火焰在地下流内的正丁醇上传播的传热大小，即气体传导、液体传导、液体对流、显热以及溢流槽壁和基底的散热。显热和对流热损失之和占总热通量的80%以上。