分级气体成分对燃气辐射管热过程影响的数值模拟及研究

发布时间：2018-05-17 22:30

本文选题：燃烧 + 辐射管　；参考：《工程科学学报》2017年01期

【摘要】：采用现有的双P型辐射管进行燃烧实验,并进行相应的CFD仿真对比,结果显示NO_x体积分数的数值计算与试验结果误差最大为3.6%,其他参数的偏差均在1%以内.将空气分级的理念应用于双P型辐射管,设计一种带支管的分区分级燃气辐射管,并对其流动和传热特性进行仿真研究.结果表明:支管通入空气量占总空气量的25%时,辐射管壁面温差最大,热效率最高;支管通入燃气量为20%时,辐射管壁面温差最小,壁面温度均匀性最好;支管以相同空燃比同时通入空气和燃气,且支管通入空燃气量为总燃气量的25%时,整个辐射管内气体温度分布最均匀;支管通入空燃气量占总气体量从5%增加到35%的过程中,壁面温差先降低后缓慢增加,支管通入燃气量为20%时辐射管壁面温差最小.
[Abstract]:The combustion experiments were carried out with the existing double P radiation tubes and the corresponding CFD simulation results showed that the maximum error between the numerical calculation and the test results of the NO_x volume fraction was 3.6%, and the deviation of other parameters was less than 1%. The concept of air classification is applied to double P type radiant tubes, and a gas radiant tube with branch tubes is designed, and its flow and heat transfer characteristics are simulated. The results show that the maximum temperature difference and the highest thermal efficiency are obtained when the air volume is 25% of the total air volume, and the temperature difference is the smallest and the temperature uniformity is the best when the gas volume is 20%. The gas temperature distribution in the whole radiation pipe is the most uniform when the branch pipe enters air and gas simultaneously at the same air-fuel ratio, and when the branch pipe enters the empty gas quantity as 25% of the total gas flow, the gas temperature distribution in the whole radiation pipe is the most uniform, and the gas flow through the branch pipe increases from 5% to 35% of the total gas quantity. The wall temperature difference decreases first and then increases slowly, and the radiation tube wall temperature difference is the smallest when the gas flow through the branch tube is 20.
【作者单位】：北京科技大学能源与环境学院;
【基金】：重点研发计划(产业前瞻与共性关键技术)资助项目(BE2015206)
【分类号】：TG155.1

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