论文部分内容阅读
利用微重力条件下向外传播的球形火焰,对贫燃极限附近甲烷/空气预混火焰的层流燃烧速度进行了测量,得到当量比从0.512(本文微重力实验中测定的可燃极限)到0.601范围内的零拉伸层流燃烧速度,并与前人实验数据和使用3种化学反应动力学模型的计算结果进行了比较.本文实验结果与已有的微重力实验数据非常接近,而其他研究者在常重力实验中得到的数据大多都明显高于微重力实验结果.不同化学反应机理预测的燃烧速度比微重力实验测量值大得多,这是因为它们主要是用远离可燃极限的燃烧速度校核的.“,”Outwardly propagating spherical flames in microgravity have been employed to determine the laminar burning velocities of near-limit fuel-lean methane/air flames.Resulting data were reported for methane/air mixtures over the specific range of equivalence ratio that extended from 0.512(the flammability limit found in the microgravity experiments) to 0.601.Present measurements of unstretched laminar burning velocities were in good agreement with the unique existing microgravity data set.Most of previous 1g experiments,however,appeared to give significantly higher burning velocities than the microgravity results.The burning velocities predicted by three chemical reaction mechanisms were also considerably higher than the present experimental data.This discrepancy was expected to be caused by the chemical mechanisms,which have been tuned primarily under off-limit conditions.