Journal of Mechanical Science and Technology

, Volume 31, Issue 4, pp 1969–1978 | Cite as

Effects of injection rate on combustion and emissions of a pilot ignited direct injection natural gas engine

  • Qian Wang
  • Changsheng Shao
  • Qing Liu
  • Zhourong Zhang
  • Zhixia He


Effects of Injection rates on combustion process and emissions of engines operating with directly injected natural gas and pilot diesel were numerically investigated. Injection rates of natural gas and diesel were investigated separately utilizing five types of injection rates. An impact factor was defined to present the effects of the initial and terminal injection rates of diesel and natural gas on the combustion and emissions more intuitionally. Based on the simulation results, cylinder pressure and temperature were more sensitive to terminal injection rates of pilot diesel than initial injection rates, and lower terminal injection rates of pilot diesel can achieve lower NO and Soot emission level. However, there is a trade-off between NO and Soot emissions affected by different natural gas injection rates. The impact factors of pilot diesel injection rates on pressure show a double-peak trend. However, the impact factors of natural gas injection rates on pressure show a single-peak trend.


Injection rate Natural gas engine Combustion Emission Simulation 


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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Qian Wang
    • 1
  • Changsheng Shao
    • 1
  • Qing Liu
    • 1
  • Zhourong Zhang
    • 1
  • Zhixia He
    • 2
  1. 1.School of Energy and Power EngineeringJiangsu UniversityZhenjiangChina
  2. 2.Institute for Energy ResearchJiangsu UniversityZhenjiangChina

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