可控水冷散热微槽道中预混燃烧多点测温实验
首发时间:2010-01-08
摘要:使用陶泥为原料制作尺寸为2.5x0.3x60mm的微槽道燃烧器。使用10对热电偶埋入燃烧器壁面中用于测量轴向温度场,使用吸水纸与铝箔复合薄板实现可控水冷散热面积。实验对微槽道燃烧器进行氢气/空气预混气体1000-170ml/min变流量工况运行的轴向温度场测量,结果显示随流量降低火焰有明显向上游移动现象。。440和360ml/min流量下的可控散热面积的轴向温度场测量显示水冷散热面变动影响了焰心位置和散热率。水冷面积增加,燃烧稳定性差,在水冷薄板覆盖面积超过1/2时发生熄火。对微槽道的能量方程计算认为:由于水冷面积增大直接导致非均相扩散项的减小,随水冷薄板的上移,焰心位置上移。微燃烧负荷变化对火焰状态会产生冲击,这在常规尺度下影响很小。
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The experiment research on multi-point temperature measurement in a water-cooling micro combustor
Abstract:The micro combustor fed with H2/air premixture was tested in this experiment. Its main part was a channel with dimension of 2.5x0.3x60mm made by cement. 10 pairs of thermal couples were buried into its substrate to measure the axial temperature during combustion. With a sheet made of combination of aluminum foil and bibulous paper inserted under the cover board, the combustor was cooled by the water diffusing through the paper. Two experiments were conducted to collect the temperature data of combustor performance varying with fuel feed amount and water-cooling rate. In the first experiment, the decrease of mixture flow rate caused flame shifted upstream and lower temperature distribution. In the second experiment, the increase of cooling area caused flame shift upstream and worse flame stability. Through theoretical analysis of energy conservation equation in micro channel, the increase of the cooling area induced the decrease of homogeneous thermal diffusion item, thus the flame center shifted upstream. This phenomenon indicates that the variation of operation condition of energy consumer would influence the flame performance upstream. This factor is neglected in macro scale combustor but is important in micro scale
Keywords: micro channel axial temperature micro scale combustion H2/air premixture
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No.3866650931612629****
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