Department of Aeronautical Engineering, King Abdulaziz University, Jeddah, Saudi Arabia.
Department of Aerospace Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, India.
J Hazard Mater. 2017 Jul 5;333:215-221. doi: 10.1016/j.jhazmat.2017.03.042. Epub 2017 Mar 21.
The laminar burning velocity of CO/N diluted stoichiometric dimethyl ether (DME) air mixtures is determined experimentally at atmospheric pressure and elevated mixture temperatures using a mesoscale high aspect-ratio diverging channel with inlet dimensions of 25mm×2mm. In this method, planar flames at different initial temperatures (T) were stabilized inside the channel using an external electric heater. The magnitude of burning velocities was acquired by measuring the flame position and initial temperature. The mass conservation of the mixture entering the inlet and the stationary planar flame front is applied to obtain the laminar burning velocity. Laminar burning velocity at different initial mixture temperatures is plotted with temperature ratio (T/T), where a reference temperature (T) of 300K is used. Enhancement in the laminar burning velocity is observed with mixture temperature for DME-air mixtures with CO and N dilutions. A significant decrease in the burning velocity and slight increase in temperature exponent of the stoichiometric DME-air mixture was observed with dilution at same temperatures. The addition of CO has profound influence when compared to N addition on both burning velocity and temperature exponent.
使用具有 25mm×2mm 入口尺寸的中尺度大纵横比发散通道，在大气压力和升高的混合温度下，实验确定了 CO/N 稀释当量二甲醚（DME）空气混合物的层流燃烧速度。在该方法中，使用外部电加热器在通道内稳定不同初始温度（T）的平面火焰。通过测量火焰位置和初始温度来获得燃烧速度的大小。混合物进入入口和静止平面火焰前缘的质量守恒用于获得层流燃烧速度。在不同的初始混合温度下绘制层流燃烧速度与温度比（T/T）的关系，其中使用 300K 的参考温度（T）。对于具有 CO 和 N 稀释的 DME-空气混合物，随着混合温度的升高，观察到层流燃烧速度增强。在相同温度下，与稀释相比，化学计量的 DME-空气混合物的燃烧速度和温度指数略有增加。与 N 添加相比，CO 的添加对燃烧速度和温度指数都有深远的影响。
