本文研究了均衡点火延迟在压缩点火发动机中的作用.进行了两组实验,一组在10°曲柄角度(CAD)上止点前(BTDC)开始对燃油喷射进行恒定喷射定时测试,另一组则为持续点火定时测试,同时保持10°CAD BTDC喷射,并在燃油混合物中添加点火改良剂(2-乙基己基硝酸盐,2-EHN).使用DMS-500仪器表征烟尘颗粒的质量、大小和数量.实验结果表明,在模型燃料混合物中加入2-EHN可降低烟尘表面积、质量浓度和平均尺寸.用20 vol％的十烷酸甲酯取代20 vol％的C7-庚烷不影响点火延迟或燃料空气预混速率、缸内峰值压力或热释放速率.在庚烷中加入甲苯(0～22.5 vol％)使烟尘颗粒的平均尺寸仅增加3％,同时气缸峰值压力和热释放峰值也略有增加.将甲苯和癸酸甲酯混合加入庚烷中,且不添加2-EHN,使预混相含量提高了至少13％.然而,添加2-EHN(4×10?4～1.5×10?3)后,预混相含量至少降低了11％.“,”This paper examines the effect of equalizing ignition delay in a compression ignition engine. Two sets of tests were conducted, i. e. a set of constant injection timing tests with start of fuel injection at 10° crank angle degree (CAD) before top dead center (BTDC) and a set of constant ignition timing tests while also keeping the 10° CAD BTDC injection and adding ignition improver (2-ethylhexylnitrate-, 2-EHN) to the fuel mixtures. Soot particles were characterized using DMS-500 instrument in terms of mass, size, and number. The experimental results showed that adding 2-EHN to the model fuel blends reduced the soot surface area, soot mass concentration and soot mean size. Replacing 20 vol％ of a C7-heptane with 20 vol％ methyl-decanoate (an oxygenated C11 molecule) did not affect the ignition delay or rate of fuel air premixing, the peak in-cylinder pressure or heat release rates. Toluene addition (0?22.5 vol％) to heptane increased the mean size of the soot particles generated by only 3％ while also resulted in a slight increase in the peak cylinder pressure and peak heat release rates. Blending toluene and methyl-decanoate into heptane without adding 2-EHN increased the premix phase fraction by at least 13％. However, by adding 2-EHN (4×10?4?1.5× 10?3), the premixed phase fraction decreased by at least 11％.