中文摘要：

以氢气/空气预混气在2mm等径石英管中的当量比燃烧为对象,采用试验和数值模拟相结合的方法研究燃烧器及其内部的温度及温度梯度,分析热回流在来流气预热中的作用。在管子上游入口段,燃烧器外壁温度随环境热风温度和气流总流量的变化不大;最高外壁温度则随热风温度和气流总量的增加而明显升高。外壁上的热回流区域随着气流总流量增加而延长。在燃烧区域附近,管壁温度沿径向向外递减,温度轴向梯度可达105K/m,形成更强热回流。在燃烧器内部,径向截面上的气体最高温度点随着气流流动不断从外侧向中心移动直到燃烧区域,温度梯度可达106K/m。对于入口预热段和燃烧段中的未燃预混气体,从入口温度升到着火温度的热量主要来自上游火焰的热回流、外侧高温气体的预热和外侧火焰面的预热,前两者都源自气体或管壁的热回流。

英文摘要：

This paper researches on stoichiometric combustion of a hydrogen/air mixture in a quartz tube with 2 mm inner diameter,in terms of temperature distribution,temperature gradient,heat recirculation and its effect on reheating incoming flow with a combination approach of experimental measures and numerical simulations..In the inlet section of the tube,the temperature of the tube＇s outer wall changes little with the hot wind temperature from atmosphere and the flow rate of hydrogen/air mixture;while the maximum value of the temperature raises obviously with the increase of the hot wind and the flow rate.The heat recirculation zone in the tube＇s outer wall extends with the flow rate of the mixture.The temperature of tube＇s inner wall falls down along the radial direction in the combustion region with the gradient up to 105 K/m,which leads to stronger heat recirculation.In the tube burner,the position where the gas temperature is maximum in the radial section moves from the outer to the inner along axial direction until it moves to the center in the combustion region and the temperature gradient of the gas is up to 106 K/m.The energy which reheats the unburned gas in the inlet section and the combustion section is mainly obtained from the heat recirculation of upstream flame,the preheating of the outboard hotter gas and the outboard flame.The energy of the prior two conditions is generated from the heat recirculation of the flow gas and the tube wall.