小型二冲程航空发动机燃烧循环变动研究

利用峰值压力、最大压力上升率、燃烧百分率以及它们各自所对应的曲轴转角和相空间重构投影法评价小型二冲程航空发动机的燃烧循环变动.通过比较,认为燃烧百分率所对应的曲轴转角能更好地表征发动机的燃烧循环变动.针对发动机在中速和不同负荷条件下的燃烧循环变动分析,结果表明随负荷的加大,缸内燃烧的循环变动会变小,认为是负荷加大,气体...

Study on cyclic variations of combustion in mini two-stroke aviation engine

The maximum pressure,maximum rate of pressure rise,mass fraction burn and its corresponding crank angle and reconstruction phase space were used to evaluate the cyclic variations of cylinder pressure under different working conditions of two-stroke aviation gasoline engine.On a comparative basis,the method of mass fraction burn and its corresponding crank angle can indicate the cyclic variations of engine more effectively.For the problem of cyclic variations of engine working in medium speed and different loads,the results show that cyclic variations will decrease with load increase,because the decrease of asymmetry of mixture gas is a main factor.After analyzing the cyclic variations at high speed working,the mini two-stroke aviation gasoline engine can work in normal condition because its coefficient of variation at different working conditions is less than 10%.The paper provided a contrastive method for performance analysis of combustion after the fuel was changed from gasoline to aviation kerosene.