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Performance of a direct-injection natural gas engine with multiple injection strategies

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  • Li, Menghan
  • Liu, Gengfei
  • Liu, Xiaori
  • Li, Zhijie
  • Zhang, Qiang
  • Shen, Boxiong

Abstract

This paper presents the experimental results for the performance of a direct-injection natural gas marine engine with different multiple injection strategies. In order to investigate the effects of natural gas post injection proportion and natural gas injection separation, a series of tests were performed at five different injection proportions (8%, 10%, 15%, 20%, 25%) and injection separation from 100μs to 700 μs at every 100 μs. The averaged cylinder pressure traces and combustion parameters (MFB50%, MFB90% and MFB5-90%) of each test point were calculated for combustion analysis. HC, CO and NOx emissions were collected to reveal the emissions characteristics. The results showed that the peak values of cylinder pressure and heat release rate will be lower than that of natural gas single injection strategy when multiple natural gas injection strategies are applied. Though the phase angle of 50% mass fraction burned is advanced at medium natural gas injection separations, the phase angle of 90% mass fraction burned is more likely to occur early at longer natural gas injection separations. With regard to emissions, HC and NOx emissions can benefit from using shorter natural gas injection separations while CO can only be reduced with small post injection proportions with certain natural gas injection separations.

Suggested Citation

  • Li, Menghan & Liu, Gengfei & Liu, Xiaori & Li, Zhijie & Zhang, Qiang & Shen, Boxiong, 2019. "Performance of a direct-injection natural gas engine with multiple injection strategies," Energy, Elsevier, vol. 189(C).
    • Handle: RePEc:eee:energy:v:189:y:2019:i:c:s0360544219320584
    DOI: 10.1016/j.energy.2019.116363
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    References listed on IDEAS

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    1. Suh, Hyun Kyu, 2011. "Investigations of multiple injection strategies for the improvement of combustion and exhaust emissions characteristics in a low compression ratio (CR) engine," Applied Energy, Elsevier, vol. 88(12), pages 5013-5019.
    2. Jeftić, Marko & Zheng, Ming, 2015. "A study of the effect of post injection on combustion and emissions with premixing enhanced fueling strategies," Applied Energy, Elsevier, vol. 157(C), pages 861-870.
    3. Huang, Haozhong & Zhou, Chengzhong & Liu, Qingsheng & Wang, Qingxin & Wang, Xueqiang, 2016. "An experimental study on the combustion and emission characteristics of a diesel engine under low temperature combustion of diesel/gasoline/n-butanol blends," Applied Energy, Elsevier, vol. 170(C), pages 219-231.
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    Cited by:

    1. Yang, Xiyu & Wang, Xiaoyan & Dong, Quan & Ni, Zuo & Song, Jingdong & Zhou, Tanqing, 2022. "Experimental study on the two-phase fuel transient injection characteristics of the high-pressure natural gas and diesel co-direct injection engine," Energy, Elsevier, vol. 243(C).
    2. Pei, Zhongwen & Liu, Kaimin & Luo, Wusheng & Yang, Jing & Li, Yangtao, 2023. "Experimental study on the effect of aftertreatment system on the energy flow pattern and emission reduction of a natural gas engine under world harmonized transient cycle," Energy, Elsevier, vol. 263(PB).
    3. Yang, Xiyu & Dong, Quan & Wang, Xiaoyan & Zhou, Tanqing & Wei, Daijun, 2023. "An experimental study on the needle valve motion characteristics of high pressure natural gas and diesel co-direct injector," Energy, Elsevier, vol. 265(C).

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