摘要
系统地研究了不同比例汽/柴油混合燃料对柴油机燃烧与排放特性的影响。研究结果表明:随着汽油比例的增加,滞燃期增长,燃烧持续期缩短,有利于燃烧等容度的提高,同时最大压力升高率也升高;随着汽油比例的增加,碳烟排放大幅度降低,NO排放有所升高,同时指示热效率基本保持不变;随着汽油比例的增加,发动机喷油时刻可变范围变窄。综合考虑燃烧噪声、热效率和排放,在转速1 400r/min、喷射压力80MPa工况下,最佳汽油掺混比例应控制在50%左右;在废气再循环条件下,与纯柴油相比,燃用汽/柴油混合燃料能够同时降低NO排放和烟度,在实现低温燃烧上具有优势。
Effects of gasoline/diesel blends in different ratios were studied in a diesel engine. The results show that as gasoline ratio increases, ignition delay increases andcombustion duration shortens, beneficial to achieve constant volume combustion, but the max. pressure rise rate increases; soot emission reduces dramatically and NO emissions increase,while indicated thermal efficiency remains almost constant and the permissible injection timing range becomes small. Considered the trade-off among combustion noise, thermal efficiency and emissions, the best gasoline ratio should be about 50 % in this study. Compared to pure diesel combustion, gasoline/diesel blend can achieve low temperature combustion with low NO and soot emissions when combined with EGR.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2013年第5期1-6,共6页
Chinese Internal Combustion Engine Engineering
基金
国家自然科学基金重点项目(51036004)
关键词
内燃机
汽
柴油混合燃料
燃烧
排放
废气再循环
IC engine
gasoline/diesel blend
combustion
emissions
exhaust gas recirculation
