正丁醇/正庚烷预混层流燃烧特性的试验研究

Experimental study on premixed laminar combustion characteristics of n-butanol/n-heptane

利用向外传播的球形火焰,试验研究了初始温度为393 K和初始压力为0.1 MPa时,当量比和正丁醇的掺混量对正丁醇/正庚烷掺混燃料的层流燃烧速度和火焰不稳定性的影响.试验结果表明：混合物的层流燃烧速度随当量比的增大先增大后减小,随正丁醇掺混量的增加逐渐增大;火焰不稳定性随当量比的增大而增加,低当量比时随正丁醇掺混量的增加逐渐增加,高当量比时随掺混量的增加逐渐减小,当量比1.1时火焰不稳定性受掺混量的影响不大.

Effects of equivalence ratio and n-butanol fraction on the laminar burning velocity and flame instability of n-butanol/n-heptane mixtures were investigated by using outwardly propagating spherical flames at 393 K and 0.1 MPa.Results show that the laminar burning velocity of the n-butanol/n-heptane mixture increases first and then decreases with the increase of the equivalence ratio,and monotonically increases with the rise of the n-butanol content.The flame instability of the n-butanol/n-heptane mixture increases with the increase of equivalence ratio.When increasing the n-butanol content,the flame instability for the lean mixture increases,while for the rich mixture decreases.The flame instability of the mixture at equivalence ratio of 1.1 changes little.