CHARACTERISTICS OF EMISSION AND COMBUSTION IN A DI ENGINE FUELLED WITH BIODIESEL BLENDS
Combustion and emission characteristics of diesel and biodiesel blends were studied in a single-cylinder DI (Direct Injection) engine under the condition of different loads at a constant speed. The results show that NO<,x> emission and fuel consumption are increased with increasing biodiesel percentage. Reduction of smoke opacity is significant at higher loads with a higher biodiesel ratio. Compared with the baseline diesel, B20 (20％biodiesel) has a slight increase of NO<,x> emission and similar fuel consumption. Smoke emission of B20 is close to that of diesel. Results of combustion analysis indicate that SOC (start of combustion) for biodiesel blends is earlier than that for diesel. Higher biodiesel percentage results in earlier SOC. Earlier SOC for biodiesel blends is due to advanced injection timing from higher density and bulk modulus and lower ignition delay from higher cetane number. PHRR (peak of heat release rate) of biodiesel blends is further decreased as increasing the biodiesel percentage, which is due to poor evaporation and atomization characteristics of biodiesel blends and lower ignition delay from higher CN (Cetane Number). Additionally, the effect of hot EGR (Exhaust Gas Recirculation) on the emissions is investigated.
Zhang Xu-sheng Hu Zong-jie Deng Jun Gao Guang-hai Wu Zhi-jun Li Li-guang
School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200030, China Tongji University, Shanghai 200092, China Tongji University, Shanghai 200092,China School of Mechanical and Power Engineering, Shanghai Jiaotong University,Shanghai 200030, China Tongji University,Shanghai 200092, China
国际会议
2007年(中国内燃机学会第六届学术年会暨国际内燃机学术研讨会和第六届中国国际内燃机及制造装备展览会)两会一展国际学术会议
上海
英文
168-176
2007-10-09（万方平台首次上网日期，不代表论文的发表时间）