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Combustion and emission performance of a split injection diesel engine in a double swirl combustion system

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  • Li, Xiangrong
  • Gao, Haobu
  • Zhao, Luming
  • Zhang, Zheng
  • He, Xu
  • Liu, Fushui

Abstract

The authors developed and tested a split injection strategy in a double swirl combustion system (DSCS). Different split injection strategies with different ratios of pilot injection fuel to total fuel mass (herein defined as “pilot injection/fuel mass ratios”) and dwell times were compared with an optimized single injection strategy in terms of the break specific fuel consumption (BSFC). The in-cylinder pressure, heat release rate and in-cylinder temperature were analyzed to explore the in-cylinder combustion process. The NOx emission was also measured. With the total fuel mass being 100 mg/cycle and excess air coefficient being 2 at 2100 r/min at a 5% pilot injection/fuel mass ratio and a 10 deg dwell time, the BSFC decreased by 2.7% compared with the single injection strategy. The NOx emission increased from 940 ppm to 1140 ppm. An ‘acceleration effect’ helped the DSCS when dwell time was short. A spray visualization experiment and numerical simulations were carried out to explain these phenomena. It is concluded that the split injection condition with a smaller pilot injection/fuel mass ratio and a shorter dwell time performed better than the single injection condition in terms of the thermo-atmosphere utilization, space utilization and acceleration effect.

Suggested Citation

  • Li, Xiangrong & Gao, Haobu & Zhao, Luming & Zhang, Zheng & He, Xu & Liu, Fushui, 2016. "Combustion and emission performance of a split injection diesel engine in a double swirl combustion system," Energy, Elsevier, vol. 114(C), pages 1135-1146.
    • Handle: RePEc:eee:energy:v:114:y:2016:i:c:p:1135-1146
    DOI: 10.1016/j.energy.2016.08.092
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    References listed on IDEAS

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    Cited by:

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    2. Zhou, Haiqin & Li, Xiangrong & Chen, Yanlin & Kang, Yuning & Liu, Dong & Liu, Fushui, 2020. "The effect of spray angle on the combustion and emission performance of a separated swirl combustion system in a diesel engine," Energy, Elsevier, vol. 190(C).
    3. Fan, Baowei & Pan, Jianfeng & Yang, Wenming & Pan, Zhenhua & Bani, Stephen & Chen, Wei & He, Ren, 2017. "Combined effect of injection timing and injection angle on mixture formation and combustion process in a direct injection (DI) natural gas rotary engine," Energy, Elsevier, vol. 128(C), pages 519-530.
    4. Lei Zhang & Tiexiong Su & Yangang Zhang & Fukang Ma & Jinguan Yin & Yaonan Feng, 2017. "Numerical Investigation of the Effects of Split Injection Strategies on Combustion and Emission in an Opposed-Piston, Opposed-Cylinder (OPOC) Two-Stroke Diesel Engine," Energies, MDPI, vol. 10(5), pages 1-17, May.
    5. XiangRong, Li & WeiHua, Zhao & HaoBu, Gao & FuShui, Liu, 2019. "Fuel and air mixing characteristics of wall-flow-guided combustion systems under a low excess air ratio condition in direct injection diesel engines," Energy, Elsevier, vol. 175(C), pages 554-566.
    6. Li, Hong-Meng & Li, Guo-Xiu & Jiang, Yan-Huan & Li, Lei & Li, Fu-Sheng, 2018. "Flame stability and propagation characteristics for combustion in air for an equimolar mixture of hydrogen and carbon monoxide in turbulent conditions," Energy, Elsevier, vol. 157(C), pages 76-86.

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