通过在四缸增压中冷柴油机上进行的甲醇能量替代比分别为5％、10％、15％的甲醇均质混合气F-T柴油引燃燃烧试验，与0＃柴油的传统燃烧对比，研究了的发动机转速、负荷、甲醇替代比对预混合引燃燃烧的循环波动的影响。结果表明：转速的增加对发动机输出动力的波动影响较小，但对预混合引燃具体燃烧过程的循环波动影响较大，瞬时放热率峰值波动率高达25％；中等负荷下，预混合引燃的循环波动较小，但在起动、怠速等小负荷工况时发动机的循环波动率较大，其中放热率峰值的循环波动率达到30％，且在大、小负荷时燃烧始点的循环波动均大于10％；甲醇替代比低时，预混合引燃燃烧模式的循环波动稍大，但当甲醇替代比增加到一定比例后循环波动率逐渐降低到与0＃柴油相当的水平，甚至更低。%Effects of engine speed , load and energy substitution ratio of methanol on combustion cycle-to-cycle fluctuation were studied experimentally in a premixed charge induced ignition combustion diesel engine .In the re-search, the combustion modes , in which the energy substitution ratio of methanol were 5%, 10%and 15%respec-tively , were compared with the original combustion mode of 0#Diesel .Results show that when increasing the en-gine speed the engine output power fluctuation change little , while the specific the combustion process change a lot with the speed increasing , whose peak value of heat release rate ( HRR) fluctuation rate reach as high as 25%;the cyclic fluctuation of the engine is small under moderate load , but large when the engine running at small load con-ditions like starting and idling , the max HRR peak value fluctuation rate reached 30%, the start of combustion fluctuation rates are always greater than 10%both at very large and small load;the cyclic fluctuation of the com-bustion mode is slightly large when methanol energy alternative in the low proportion , however , when methanol ratio increases to a certain value the cyclic fluctuation gradually reduced to the level of 0#diesel engine , or even lower .
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