State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
J Hazard Mater. 2011 Jan 30;185(2-3):756-62. doi: 10.1016/j.jhazmat.2010.09.085. Epub 2010 Oct 1.
The aim of this paper is to provide new experimental data of the minimum ignition energy (MIE) of gaseous nitromethane/air mixtures to discuss the explosion pressure and the flame temperature as a function of nitromethane concentration. Observations on the influence of nitromethane concentration on combustion pressure and temperature through the pressure and temperature measure system show that peak temperature (the peak of combustion temperature wave) is always behind peak pressure (the peak of the combustion pressure wave) in arrival time, the peak combustion pressure of nitromethane increases in the range of its volume fraction 10-40% as the concentration of nitromethane increases, and it slightly decreases in the range of 40-50%. The maximum peak pressure is equal to 0.94 MPa and the minimum peak pressure 0.58 MPa. Somewhat similar to the peak pressure, the peak combustion temperature increases with the volume fraction of nitromethane in the range of 10-40%, and slightly decreases in 40-50%. The maximum peak temperature is 1340 °C and the minimum 860 °C. The combustion temperature rise rate increases with the concentration of nitromethane in 10-30%, while decreases in 30-50% and its maximum value of combustion temperature rise rate in 10-50% is 4200 °C/s at the volume fraction of 30%. Influence of the concentration of nitromethane on the combustion pressure rise rate is relatively complicated, and the maximum value of rise rate of combustion pressure wave in 10-50% is 11 MPa/s at the concentration 20%.
本文的目的是提供气态硝基甲烷/空气混合物的最小点火能（MIE）的新实验数据，以讨论爆炸压力和火焰温度作为硝基甲烷浓度的函数。通过压力和温度测量系统观察到硝基甲烷浓度对燃烧压力和温度的影响表明，到达时间时，峰值温度（燃烧温度波的峰值）总是落后于峰值压力（燃烧压力波的峰值），随着硝基甲烷体积分数在 10-40%范围内的增加，硝基甲烷的最大峰值燃烧压力增加，而在 40-50%范围内略有下降。最大峰值压力等于 0.94 MPa，最小峰值压力为 0.58 MPa。与峰值压力有些相似，峰值燃烧温度随着硝基甲烷体积分数在 10-40%范围内的增加而增加，在 40-50%范围内略有下降。最大峰值温度为 1340°C，最小峰值温度为 860°C。燃烧温度升高率随着硝基甲烷浓度在 10-30%范围内的增加而增加，而在 30-50%范围内则下降，其在 10-50%范围内的最大燃烧温度升高率为 4200°C/s，在体积分数为 30%时。硝基甲烷浓度对燃烧压力升高率的影响较为复杂，在 10-50%范围内，燃烧压力波的最大升高率为 11 MPa/s，浓度为 20%。
