Studies on Burner Flames of Hydrogen-Oxygen Mixtures at High Pressures
Studies on Burner Flames of Hydrogen-Oxygen Mixtures at High Pressures
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高压氢氧混合物燃烧器火焰的研究
DOI：
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发表时间：
1952
期刊：
影响因子：
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通讯作者：
R. Edse
中科院分区：
文献类型：
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作者：
R. Edse
摘要：描述了一种用于研究压力高达 100 个大气压的本生灯火焰的新装置。对于氢氧混合物，高压下的火焰总是湍流，除非使用内径远小于 0.03 cm 的燃烧管。大气压力和 14.6 个大气压下氢氧湍流火焰的闪回条件由燃烧器管壁处的临界速度梯度给出。燃烧器尖端的温度对火焰的回火倾向有很大影响。对于管状火焰，临界回火梯度大于层流火焰。发现稳定火焰和回火之间的界限非常明显。根据火焰压力的测量和火焰锥的照片得出结论，湍流火焰的燃烧速度不大于层流火焰的燃烧速度。根据混合比的不同，氢氧火焰在14.6个大气压下的燃烧速度是大气火焰的2至3倍。从理论上的考虑可以得出结论，氢氧火焰的燃烧速度随着压力的增加而增加，因为火焰温度随着压力的增加而增加，因此从燃烧区到未燃烧气体的热传导也随着增加。用 21 英尺光栅摄谱仪记录的氢氧火焰发射光谱的强度随着压力的增加而大大增加。等强度法用于测量火焰温度。
Abstract : A new apparatus for the study of bunsen burner flames at pressures up to 100 atmoshperes is described. With hydrogen-oxygen mixtures the flames at elevated pressures are always turbulent unless burner tubes with an inner diameter much smaller than 0.03 cm are used. The flash-back conditions of turbulent hydrogen-oxygen flames at atmospheric pressure and at 14.6 atmospheres are given by the critical velocity gradient at the wall of the burner tube. The temperature of the burner tip has a large effect on the flash-back tendency of the flame. For tubulent flames the critical flash-back gradient is larger than for laminar flames. The limit between stable flame and flash-back was found to be very sharp. From measurements of the flame pressures and from photographs of the flame cones it is concluded that the burning velocity of turbulent flames to not larger than that of laminar flames. Depending on mixture ratio the burning velocities of hydrogen-oxygen flames at 14.6 atmospheres are 2 to 3 times as large as those of atmospheric flames. From a theoretical consideration it is concluded that the burning velocities of hydrogen-oxygen flames increase with pressure because the flame temperatures increase with pressure, and thus also the heat conduction from the burning zone into the unburned gas. The intensity of the emission spectrum of hydrogen-oxygen flames recorded with a 21 ft. grating spectrograph is greatly increased with pressure. The iso-intensity method is used for the measurement of flame temperatures.