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Exergy analysis of combustion in VGT-modified diesel engine with detailed chemical kinetics mechanism

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  • Taghavifar, Hadi
  • Khalilarya, Shahram
  • Jafarmadar, Samad

Abstract

Altogether eight different configurations were considered regarding the bowl geometry to analyze the exergy terms as well as soot mass fraction distribution. Bowl configuration modification was detected to alter exergy and irreversibility by virtue of (1) spray-wall impingement, (2) HRR (heat release rate) delay and combustion initiation postponement (3) squish pressure flow and air-fuel mixing process. The highest total exergy peak and the second law efficiency are attributed to D4 configuration equal to 342.69 J, 49.93%, respectively. The general trend shows that increasing the bowl displacement led to 17.2% and 39.7% increase in the first and second law efficiency, respectively. Results show that only 6.15% exergy efficiency gain is expected with bowl radius modification. An irreversibility rate correlation was proposed based on the most effective parameters with the coefficient determination factor of 0.993, indicating the total completion of the equation. Based on the modeling equation, the highest impact on irreversibility rate is of heat release rate with impact coefficient of 0.471, while soot mass fraction showed inverse proportion (−0.004379) with irreversibility rate. Higher boost and pressure monitoring of the VGT-modified diesel engine can deliver optimized air/fuel mixing mechanism, which gives way to efficient combustion and exergetic performance.

Suggested Citation

  • Taghavifar, Hadi & Khalilarya, Shahram & Jafarmadar, Samad, 2015. "Exergy analysis of combustion in VGT-modified diesel engine with detailed chemical kinetics mechanism," Energy, Elsevier, vol. 93(P1), pages 740-748.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p1:p:740-748
    DOI: 10.1016/j.energy.2015.09.089
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    References listed on IDEAS

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    1. Mahabadipour, Hamidreza & Srinivasan, Kalyan K. & Krishnan, Sundar R., 2019. "An exergy analysis methodology for internal combustion engines using a multi-zone simulation of dual fuel low temperature combustion," Applied Energy, Elsevier, vol. 256(C).
    2. Zhu, Dengting & Zheng, Xinqian, 2019. "Potential for energy and emissions of asymmetric twin-scroll turbocharged diesel engines combining inverse Brayton cycle system," Energy, Elsevier, vol. 179(C), pages 581-592.
    3. Taghavifar, Hadi & Nemati, Arash & Salvador, F.J. & De la Morena, J., 2019. "Improved mixture quality by advanced dual-nozzle, included-angle split injection in HSDI engine: Exergetic exploration," Energy, Elsevier, vol. 167(C), pages 211-223.
    4. Zhu, Dengting & Zheng, Xinqian, 2018. "A new asymmetric twin-scroll turbine with two wastegates for energy improvements in diesel engines," Applied Energy, Elsevier, vol. 223(C), pages 263-272.
    5. Zhu, Dengting & Zheng, Xinqian, 2017. "Asymmetric twin-scroll turbocharging in diesel engines for energy and emission improvement," Energy, Elsevier, vol. 141(C), pages 702-714.

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