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An experimental study on the needle valve motion characteristics of high pressure natural gas and diesel co-direct injector

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  • Yang, Xiyu
  • Dong, Quan
  • Wang, Xiaoyan
  • Zhou, Tanqing
  • Wei, Daijun

Abstract

To reveal the gas needle valve dynamic characteristics of the high pressure natural gas and diesel co-direct injector, an innovative non-intrusive needle valve motion characteristics measurement method is proposed. The influence of needle valve movement on injection rate is investigated, and the effect of diesel pressure fluctuation on needle lift process is revealed. The results indicated that the lifting speed of the needle increases with the increase of gas injection pressure. Under the same injection pressure, the displacement curve of the needle valve changes from triangle to trapezoid with the increase in energizing time. Due to the change of the gas flow throttle position, the injection rate does not correspond linearly with the needle displacement curve. In the process of needle upstroke, there are two different velocities in the rising process of the injection rate. Furthermore, in the diesel system, the compression wave reflected from the common rail has a significant influence on the needle dynamic characteristics and injection rate which becomes more obvious with the decrease in injection pressure. Under the action of reflected compression wave, the moment delay of needle reaching the maximum position can reach 0.6 ms, and the gas injection mass can be reduced by 16%.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:265:y:2023:i:c:s0360544222031437
    DOI: 10.1016/j.energy.2022.126257
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    References listed on IDEAS

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    1. 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).
    2. 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).
    3. Lee, Sangho & Yi, Ui Hyung & Jang, Hyungjoon & Park, Cheolwoong & Kim, Changgi, 2021. "Evaluation of emission characteristics of a stoichiometric natural gas engine fueled with compressed natural gas and biomethane," Energy, Elsevier, vol. 220(C).
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    Cited by:

    1. Liu, Bingxin & Fei, Hongzi & Wang, Liuping & Fan, Liyun & Yang, Xiaotao, 2024. "Real-time estimation of fuel injection rate and injection volume in high-pressure common rail systems," Energy, Elsevier, vol. 298(C).

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