起动过程中喷油规律对汽油/生物柴油RCCI发动机性能的影响
罗义豪1，谭玉松1，陈海富1，王伟发2，李晶3*，杨文明4
1.国能（清远）清洁能源有限公司，广东 清远 511500；2.深圳市怡昌动力技术有限公司，广东 深圳 518109；
3.南京工业大学机械与动力工程学院，江苏 南京 211816；4.新加坡国立大学机械工程系，新加坡 117576
摘要：基于三维数值模拟方法，仿真分析起动过程中喷油规律曲线的靴形长度和进气温度对汽油/生物柴油反应活性控制压燃（reactivity controlled compression ignition，RCCI）发动机燃烧及排放特性的影响规律。结果表明：增大喷油规律中的靴形长度可提高喷油后期的喷射速率，促进生物柴油的雾化和混合，进而提高缸内压力、热释放率峰值、指示平均有效压力，减少CO排放，但导致NO排放增加；当进气温度较低时，可采用长靴形的喷油规律曲线形状，提高燃烧效率，以防失火；较高的进气温度有助于改善燃烧稳定性，减弱喷油规律曲线形状对燃烧过程的作用，并显著降低CO排放。
关键词：汽油；生物柴油；RCCI发动机；喷油规律曲线形状；起动过程
Effect of fuel injection rate on the performance of a gasoline/biodiesel RCCI engine during the starting process
LUO Yihao1, TAN Yusong1, CHEN Haifu1, WANG Weifa2, LI Jing3*, YANG Wenming4
1. Guoneng (Qingyuan) Clean Energy Co., Ltd., Qingyuan 511500, China;
2. Shenzhen Yicheong Power Co., Ltd., Shenzhen 518109, China;
3. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China;
4. Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore
Abstract: Based on three-dimensional numerical simulations, the effects of injection rate shapes with different boot lengths and intake temperatures on the combustion and emission characteristics of a gasoline/biodiesel reactivity controlled compression ignition (RCCI) engine during the starting process are investigated. The results indicate that increasing the boot length increases the late-stage injection rate promotes the atomization and mixing of biodiesel, thereby increases in-cylinder pressure, peak heat release rate, and indicates mean effective pressure while reduces CO emissions, which leads to increased NO emissions. Under the low intake temperature condition, employing a long boot length can improve combustion efficiency and prevent misfire. A higher intake temperature helps improve combustion stability, mitigates the influence of injection rate shape, and significantly reduces CO emission.
Keywords: gasoline; biodiesel; RCCI engine; injection rate shape; starting process
