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Experimental study on factors affecting lean combustion limit of S.I engine fueled with compressed natural gas and hydrogen blends

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  • Wang, Xin
  • Zhang, Hongguang
  • Yao, Baofeng
  • Lei, Yan
  • Sun, Xiaona
  • Wang, Daojing
  • Ge, Yunshan

Abstract

In order to study factors affecting lean combustion limit, an experimental study was carried out on a spark- ignited engine fueled with compressed natural gas and hydrogen blends. Effects of ignition timing, hydrogen fraction, engine speed, throttle opening, coolant and oil temperature were investigated. Experiments were conducted at a low and moderate level of engine load and speed with a wide range of hydrogen fraction, varying from 0 to 40 percent by volume. The results indicated that lean combustion limit could be obviously extended by adding hydrogen into compressed natural gas. In addition, leaner but more stable combustion can be acquired under higher throttle opening or lower engine speed conditions. Ignition timing was studied separately, a series of timings were adjusted around lean combustion limit under various conditions. Experiments also demonstrated that both over-advanced and over-retarded ignition could lead to a reduction in lean operating area of the engine. Further experiments on coolant and lubricant oil pointed out that lean combustion limit was positively correlated with coolant temperature; while an oil temperature increase corresponded to an initial decrease followed by an increase in lean combustion limit.

Suggested Citation

  • Wang, Xin & Zhang, Hongguang & Yao, Baofeng & Lei, Yan & Sun, Xiaona & Wang, Daojing & Ge, Yunshan, 2012. "Experimental study on factors affecting lean combustion limit of S.I engine fueled with compressed natural gas and hydrogen blends," Energy, Elsevier, vol. 38(1), pages 58-65.
    • Handle: RePEc:eee:energy:v:38:y:2012:i:1:p:58-65
    DOI: 10.1016/j.energy.2011.12.042
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    References listed on IDEAS

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    7. Nguyen Ba Hung & Ocktaeck Lim, 2020. "Development of a High-Performance Electric Pressure Regulator Applied for Compressed-Natural-Gas-Fueled Vehicles," Sustainability, MDPI, vol. 12(19), pages 1-15, September.
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    10. Zhang, H.G. & Han, X.J. & Yao, B.F. & Li, G.X., 2013. "Study on the effect of engine operation parameters on cyclic combustion variations and correlation coefficient between the pressure-related parameters of a CNG engine," Applied Energy, Elsevier, vol. 104(C), pages 992-1002.
    11. Mehra, Roopesh Kumar & Duan, Hao & Juknelevičius, Romualdas & Ma, Fanhua & Li, Junyin, 2017. "Progress in hydrogen enriched compressed natural gas (HCNG) internal combustion engines - A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 1458-1498.
    12. Rafaa Saaidia & Mohamed Ali Jemni & Mohamed Salah Abid, 2017. "Simulation and Empirical Studies of the Commercial SI Engine Performance and Its Emission Levels When Running on a CNG and Hydrogen Blend," Energies, MDPI, vol. 11(1), pages 1-22, December.
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