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首页> 外文期刊>Combustion Science and Technology >Lean Methane-Air Flames Propagating Upward in Vertical Tubes
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Lean Methane-Air Flames Propagating Upward in Vertical Tubes

机译：稀薄的甲烷-空气火焰在垂直管中向上传播

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摘要

The upward propagation of a lean methane-air flame in a vertical tube is investigated. The shape and the velocity of the flame front are extracted from video records, and the velocity of the flow induced by the flame is measured with particle image velocimetry (PIV) using alumina particles to seed the gas. The thermophoretic drift of these particles relative to the gas is shown to cause an error in the PIV measurements in the transport region of the flame, where the temperature gradient is large. An iterative correction of the measured velocity is proposed that uses simplified, quasiunidimensional energy and species conservation equations to compute an approximation to the profile of gas temperature across the flame in terms of the profile of gas velocity. The correction is tested using synthetic velocity fields and applied along the axis of the tube. The results of the quasiuni-dimensional model also show that a conduction-radiation balance is approached in a region of low velocity that develops behind the flame front when the flammability limit is approached. Radiation losses from the combustion products in this region then become important and may cause the extinction of the flame.
机译：研究了贫甲烷空气火焰在垂直管中的向上传播。从视频记录中提取火焰前锋的形状和速度，并使用氧化铝颗粒播种气体，通过颗粒图像测速仪（PIV）测量由火焰引起的气流速度。这些粒子相对于气体的热泳漂移表明在火焰的传输区域（温度梯度较大）的PIV测量中会引起误差。提出了一种对测得速度的迭代校正方法，该方法使用简化的准一维能量和物种守恒方程来根据气体速度的分布来计算穿过火焰的气体温度分布的近似值。校正使用合成速度场进行测试，并沿着管的轴进行应用。准一维模型的结果还表明，当接近可燃性极限时，在火焰前部后方发展的低速区域将达到传导辐射平衡。然后，来自该区域的燃烧产物的辐射损失变得很重要，并可能导致火焰熄灭。

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