多参数耦合作用对仲丁醇层流燃烧速度的影响

Effect of multi-parameter coupling on sec-butanol laminar burning velocity

利用纹影法和球形火焰扩散法,在不同环境温度、压力和当量比下研究仲丁醇-空气层流燃烧特性.重点分析环境参数与当量比的耦合作用对仲丁醇层流燃烧的无拉伸火焰传播速度、无拉伸层流燃烧速度的变化值、变化率、变化率之比的影响.结果表明:在环境压力和当量比的耦合作用下,压力越大,无拉伸火焰传播速度变化越小;无拉伸火焰传播速度变化率比值随着当量比的增加而增加,直到当量比为1.10左右时,开始呈现下降趋势;当量比小于1.05时,低压环境对层流燃烧影响更大;在环境温度和当量比的耦合作用下,当量比为0.75~1.15时,无拉伸火焰传播速度变化受较高环境温度影响更大;在当量比小于0.85和大于1.45时,当量比对无拉伸层流燃烧速度影响较大.

The effects of atmospheric pressure,unburned mixture temperature and equivalence ratio on the sec-butanol-air laminar flow combustion were investigated by the smear method and the spherical flame diffusion method.The coupling effects of environmental parameters and equivalence ratio on the unstretched laminar burning propagation velocity and the change value,change rate and ratio of change rate of unstretched laminar burning propagation velocity were mainly analyzed.The results show that the larger the pressure is,the smaller the variation of unstretched laminar propagation velocity is under the coupling of ambient pressure and equivalent ratio.The ratio of change rate of unstretched laminar burning propagation velocity is increased with the increasing of equivalence ratio with downward trend for the equivalence ratio around 1.10.When the equivalence ratio is less than 1.05,the low pressure environment has greater influence on the laminar flow combustion.Under the coupling of ambient temperature and equivalence ratio,the propagation velocity of unstretched flame is more affected by higher ambient temperature when the equivalence ratio is in the range from 0.75 to 1.15.When the equivalence ratio is less than 0.85 or greater than 1.45,the equivalent ratio has great influence on the rate of non-tensile laminar flow combustion.