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Extinction Characteristics Of Premixed Flame In Heated Microchannel At Reduced Pressures

机译:减压下加热的微通道中预混火焰的消光特性

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The effects of pressure, flow velocity and mixture composition on extinction limits of pre-mixed methanelair flames in a mesoscale channel (2 mm) with a temperature gradient were studied both experimentally and numerically at low pressure conditions (0.2-0.05 atm). An external heat source was employed to form a steady temperature gradient along the channel for simulating the state of the heat recirculation. At low pressure conditions, combustion in a small-scale channel can be simulated since flame becomes thicker with the decrease of pressure. Both experimental and numerical results showed that maximum upper blow-off limits were found to be at the fuel-leaner side under low pressure conditions. That is, the flammable regions under low pressure conditions showed tendencies asymmetric to the stoichiometric mixture ratio, while the conventional flammable region at atmospheric pressure is symmetric to it. Furthermore, computational results implied the existence of a lower extinction limit of stable flame although heat loss was compensated for by the external heater.
机译:在低压条件下(0.2-0.05 atm),通过实验和数值研究了压力,流速和混合物组成对中尺度通道(2 mm)中具有温度梯度的甲烷预混合火焰的熄灭极限的影响。采用外部热源沿通道形成稳定的温度梯度,以模拟热循环状态。在低压条件下,由于火焰随着压力的降低而变厚,因此可以模拟小规模通道中的燃烧。实验和数值结果均表明,在低压条件下,最大排空上限位于燃料稀薄侧。即,在低压条件下的易燃区域显示出与化学计量混合比不对称的趋势,而在大气压下的常规易燃区域与其对称。此外,计算结果表明,尽管外部加热器可以补偿热量损失,但稳定火焰的消光极限仍然存在。

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