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Split diesel injection effect on knocking of natural gas/diesel dual-fuel engine at high load conditions

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  • Yousefi, Amin
  • Guo, Hongsheng
  • Birouk, Madjid

Abstract

Advancing the start of diesel injection timing is an effective way to enhance thermal efficiency and reduce greenhouse gas (GHG) emissions of natural gas/diesel dual-fuel (NDDF) engine. However, severe thermodynamic conditions under high engine load conditions may increase the propensity for engine knocking when advancing the start of diesel injection (SODI). In this study, the strategy of split diesel injection (two-pulse injection) is used and its feasibility as a method to reduce knocking intensity and improve thermal efficiency of NDDF engine is investigated. The results reveal that advancing single diesel injection timing significantly increases knocking intensity, whereas split diesel injection strategy decreases knocking intensity. The results also show that, when using split diesel injection, the flame kernels do not propagate as fast and deep as in the case of single diesel injection. This slows down the pressure and temperature rise rate in the unburned end-gas region and thus reduces knocking tendency. Moreover, the early partially burning of the premixed natural gas – air mixture in the squish region dilutes the unburned end-gas and consequently makes it resistant to auto-ignition. NDDF engine with split diesel injection can reach a maximum thermal efficiency that is comparable to that observed under knocking conditions of single diesel injection. Using either, single or split, diesel injection strategy reduces GHG emissions of NDDF engine (up to 12%) compared to its counterpart diesel engine. However, the lowest GHG emissions of NDDF engine with single diesel injection strategy is recorded under knocking conditions.

Suggested Citation

  • Yousefi, Amin & Guo, Hongsheng & Birouk, Madjid, 2020. "Split diesel injection effect on knocking of natural gas/diesel dual-fuel engine at high load conditions," Applied Energy, Elsevier, vol. 279(C).
    • Handle: RePEc:eee:appene:v:279:y:2020:i:c:s0306261920313064
    DOI: 10.1016/j.apenergy.2020.115828
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    3. Hazar, Hanbey & Tekdogan, Remziye & Sevinc, Huseyin, 2021. "Determination of the effects of oxygen-enriched air with the help of zeolites on the exhaust emission and performance of a diesel engine," Energy, Elsevier, vol. 236(C).
    4. Md Modassir Khan & Arun Kumar Kadian & Rabindra Prasad Sharma & S M Mozammil Hasnain & Ahmed Mohamed & Adham E. Ragab & Ali Zare & Shatrudhan Pandey, 2023. "Emission Reduction and Performance Enhancement of CI Engine Propelled by Neem Biodiesel-Neem Oil-Decanol-Diesel Blends at High Injection Pressure," Sustainability, MDPI, vol. 15(11), pages 1-18, June.
    5. Liu, Junheng & Liu, Yuan & Ji, Qian & Sun, Ping & Zhang, Xuchao & Wang, Xidong & Ma, Hongjie, 2023. "Effects of split injection strategy on combustion stability and GHG emissions characteristics of natural gas/diesel RCCI engine under high load," Energy, Elsevier, vol. 266(C).
    6. Park, Hyunwook & Shim, Euijoon & Lee, Junsun & Oh, Seungmook & Kim, Changup & Lee, Yonggyu & Kang, Kernyong, 2023. "Comparative evaluation of conventional dual fuel, early pilot, and reactivity-controlled compression ignition modes in a natural gas-diesel dual-fuel engine," Energy, Elsevier, vol. 268(C).

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