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Effect of swirl ratio on NG/diesel dual-fuel combustion at low to high engine load conditions

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

Abstract

Recent regulation on pollutant and greenhouse gas (GHG) emissions has exerted great pressure on diesel engine industries which generate significant amount of GHG and pollutants. The concept of lean burn pilot ignited natural gas/diesel dual-fuel (NDDF) combustion is considered as one of the most suitable engine platforms to meet emissions and fuel economy regulations over a short to medium term. However, a major challenge is the slightly lower fuel efficiency and high level of methane (CH4) and carbon monoxide (CO) emissions, especially under low to medium engine load conditions. This paper numerically investigates the influence of swirl ratio on the combustion performance and emissions of a NDDF engine under low to high load conditions. The results at low load-low speed condition and retarded injection timing of 14 crank angle degrees before top dead center (BTDC) suggest that increasing swirl ratio from 0.5 to 1.5 significantly improves fuel efficiency and CH4 and CO emissions. However, under the same engine load-speed condition but at advanced injection timing of 30 crank angle degrees BTDC, increasing swirl ratio deteriorates the fuel efficiency and CH4 and CO emissions. Under a medium load-high speed condition, swirl ratio significantly improves diffusion combustion and turbulent flame propagation of natural gas. The results show that OH radical propagates more rapidly in the azimuthal direction when increasing the swirl ratio from 0.5 to 1.5. Further increase in the swirl ratio causes the peak pressure to exceed the limit (160 bar). At high load-low speed condition, increasing the swirl ratio significantly improves diesel diffusion and flame propagation of natural gas, which consequently enhances fuel efficiency. Under this engine load-speed condition, OH radical distribution shows that the combustion progresses rapidly within each jet in both the azimuthal and radial directions. Considering fuel efficiency and emissions, a swirl ratio of 1.5 is found to be the optimum. Overall, it is concluded that swirl motion may provide better mixture preparation, diesel diffusion, and natural gas flame propagation. However, this benefit may not persist under very high swirl ratio (swirl ratio > 1.5) due to higher heat losses.

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  • Yousefi, Amin & Guo, Hongsheng & Birouk, Madjid, 2018. "Effect of swirl ratio on NG/diesel dual-fuel combustion at low to high engine load conditions," Applied Energy, Elsevier, vol. 229(C), pages 375-388.
    • Handle: RePEc:eee:appene:v:229:y:2018:i:c:p:375-388
    DOI: 10.1016/j.apenergy.2018.08.017
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    References listed on IDEAS

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    5. 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).
    6. Yang, Kailin & Wang, Zhongshu & Zhang, Kechao & Wang, Dan & Xie, Fangxi & Xu, Yun & Yang, Kaiqiang, 2023. "Impact of natural gas injection timing on the combustion and emissions performance of a dual-direct-injection diesel/natural gas engine," Energy, Elsevier, vol. 270(C).
    7. Ahmad, Zeeshan & Kaario, Ossi & Qiang, Cheng & Vuorinen, Ville & Larmi, Martti, 2019. "A parametric investigation of diesel/methane dual-fuel combustion progression/stages in a heavy-duty optical engine," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    8. Nayak, Swarup Kumar & Mishra, Purna Chandra & Noor, Muhamad Mat, 2019. "Simultaneous reduction of nitric oxide and smoke opacity in TDI dual fuel engine fuelled with calophyllum-diesel blends and waste wood chip gas for modified inlet valve and injector nozzle geometry," Energy, Elsevier, vol. 189(C).
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