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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.
The existing double P-type radiant tube was used to carry out combustion experiments and the corresponding CFD simulation results were compared. The results show that the numerical error of NO_x volume fraction is about 3.6% and the error of other parameters is within 1% The concept of grading was applied to double P-type radiant tubes, a kind of graded gas radiant tubes with branch pipes was designed, and its flow and heat transfer characteristics were simulated.The results showed that the amount of air inflow into the branch pipes accounted for 25% , The maximum temperature difference between the wall surface of radiant tube and the thermal efficiency was the highest. When the branch gas flow was 20%, the temperature difference between the wall of the radiant tube and the wall surface was the lowest. The branch pipe was ventilated with air and gas at the same air- When the amount of air-fuel is 25% of the total gas quantity, the temperature distribution of the gas in the whole radiant tube is the most uniform. When the amount of air-to-air input in the branch pipe increases from 5% to 35%, the temperature difference in the wall first increases slowly and then increases slowly. Branch pipe access to the amount of gas is 20% minimum radiation tube wall temperature difference.