摘要
为研究进气温度、过量空气系数和发动机转速对甲醇HCCI燃烧循环变动和燃烧稳定性的影响,在1台改造的试验发动机上进行相关的试验。试验结果表明:随着进气温度的升高,循环变动变大,最高燃烧压力的分布较为集中;循环变动系数对过量空气系数较为敏感,随着过量空气系数的增大,循环变动变大,最高燃烧压力的分布较为分散;随着转速的增大,循环变动变小,最高燃烧压力的平均值变大,最高燃烧压力分布集中,对于甲醇而言,进气温度为160℃,过量空气系数为2时,n=1 300r/min是较优的转速。
In order to study the influences of intake temperature ,excess air coefficient and engine speed on methanol HCCI combustion stability and cycle-to-cycle variation ,the relevant tests were carried out on a retrofit engine .The results show that the cycle-to-cycle variation increases and the distribution of maximum combustion pressure concentrates with the increase of in-take temperature .The excess air coefficient is more sensitive to the coefficient of cycle-to-cycle variation .With the increase of excess air coefficient , the cycle-to-cycle variation decreases and the distribution of maximum combustion pressure scatters . With the increase of engine speed ,the cycle-to-cycle variation decreases ,the mean value of maximum combustion pressure in-creases and its distribution concentrates .For the methanol fuel ,1 300 r/min is the optimal speed at 160 ℃ of intake tempera-ture and when the excess air coefficient is 2 .
出处
《车用发动机》
北大核心
2014年第1期70-73,共4页
Vehicle Engine
基金
陕西省自然科学基础研究计划项目(2012JQ7031)
长安大学中央高校专项资金项目(2013G1502063)
新疆工程学院博士科研基金(2013BQJ091607)
