【摘要】 作者研究了一台单缸二冲程汽油机在不同的过量空气系数下，燃烧中间产物CH（431．5nm）和C2（516．5nm）的发光强度ICH*、IC2在燃烧过程中的变化规律。通过实验发现，ICH*／IC*和过量空气系数近似呈线性关系。在用最小二乘法回归了这一关系的数学表达式后，采用此方法测量了气缸内燃烧过程单个循环中瞬时过量空气系数的变化。通过分析过量空气系数概率密度函数，评价了汽油机在不同工况下的混合气均匀性和燃烧过程的稳定性。更多还原

【Abstract】 The changes of the crnission intensities of CH, ICH* (431 .5 nm) and C2, IC2 (516.5 nm) during the combustion process in a single-cylinder two stroke gasoline engine are studied under different excess air coefficients. The experimental results show that there is an approximately linear correlation between ICH*/IC2 and excess air coefficicnt. After the mathematic expression is given out based on the least square method, the instantaneous excess air coefficicnt during one combustion cycle in a cylinder is measured by using this method. The mixture uniformity and the combustion steadiness of a gasoline engine under various operating conditions are evaluated by means of analysing the excess air coefficient probability density function.更多还原