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Research on effects of early intake valve closure (EIVC) miller cycle on combustion and emissions of marine diesel engines at medium and low loads

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  • Wei, Shengli
  • Zhao, Xiqian
  • Liu, Xin
  • Qu, Xiaonan
  • He, Chunhui
  • Leng, Xianyin

Abstract

The Miller cycle with EIVC is applied to a medium-speed marine diesel engine to achieve high-efficiency combustion and low nitrogen oxide (NOx) emissions. The effects of Miller cycle on the state parameters, combustion characteristics, NO emissions, and the spatial distribution of working fluid were analyzed. A one-dimensional (1D) simulation model was established by using the BOOST software. The FIRE software was used to simulate the combustion process and emission characteristics of the diesel engine at medium and low loads. The results show that in the E3 cycle (four kinds of loads, 100%, 75%, 50%, 25%, according to Marine application propeller law), with the proper EIVC, the in-cylinder pressure, temperature and NO emission will be reduced. At the load of 50%, NO emissions were reduced by 17.8%, At 25% load NO emissions were reduced by 14.9%. During the fuel injection, the decrease of in-cylinder temperature causes a longer ignition delay period. When the EIVC is too early, the heat release rate increases sharply, at the same time, the NO generation also increases. Furthermore, it will lead to misfire at low load.

Suggested Citation

  • Wei, Shengli & Zhao, Xiqian & Liu, Xin & Qu, Xiaonan & He, Chunhui & Leng, Xianyin, 2019. "Research on effects of early intake valve closure (EIVC) miller cycle on combustion and emissions of marine diesel engines at medium and low loads," Energy, Elsevier, vol. 173(C), pages 48-58.
    • Handle: RePEc:eee:energy:v:173:y:2019:i:c:p:48-58
    DOI: 10.1016/j.energy.2019.01.110
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    References listed on IDEAS

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    Cited by:

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    2. Yao, Zhi-Min & Qian, Zuo-Qin & Li, Rong & Hu, Eric, 2019. "Energy efficiency analysis of marine high-powered medium-speed diesel engine base on energy balance and exergy," Energy, Elsevier, vol. 176(C), pages 991-1006.
    3. Tripathy, Srinibas & Das, Abhimanyu & Sahu, Balram & Srivastava, Dhananjay Kumar, 2020. "Electro-pneumatic variable valve actuation system for camless engine: Part I-development and characterization," Energy, Elsevier, vol. 193(C).
    4. Ji, Shaobo & Chen, Qiulin & Shu, Minglei & Tian, Guohong & Liao, Baoliang & Lv, Chengju & Li, Meng & Lan, Xin & Cheng, Yong, 2020. "Influence of operation management on fuel consumption of coach fleet," Energy, Elsevier, vol. 203(C).
    5. Zhou, Xinyi & Li, Tie & Yi, Ping, 2021. "The similarity ratio effects in design of scaled model experiments for marine diesel engines," Energy, Elsevier, vol. 231(C).
    6. Ziyu Wang & Rulou Cao & Yanfang Li & Caifeng Hao & Jinlong Liu & Yanzhao An & Renwei Ma, 2023. "Investigation of Lips-Guided-Flow Combustion Chamber and Miller Cycle to Improve the Thermal Efficiency of a Highly Intensified Diesel Engine," Sustainability, MDPI, vol. 15(20), pages 1-20, October.
    7. Wang, Dawei & Shi, Lei & Zhu, Sipeng & Liu, Bo & Qian, Yuehua & Deng, Kangyao, 2020. "Numerical and thermodynamic study on effects of high and low pressure exhaust gas recirculation on turbocharged marine low-speed engine," Applied Energy, Elsevier, vol. 261(C).
    8. Motong Yang & Yaodong Wang, 2023. "Application of Miller Cycle and Net-Zero Fuel(s) to Diesel Engine: Effect on the Performance and NOx Emissions of a Single-Cylinder Engine," Energies, MDPI, vol. 16(5), pages 1-21, March.

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