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Exergy evaluation of equivalence ratio, compression ratio and residual gas effects in variable compression ratio spark-ignition engine using quasi-dimensional combustion modeling

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  • Rakopoulos, Constantine D.
  • Rakopoulos, Dimitrios C.
  • Kyritsis, Dimitrios C.
  • Andritsakis, Eleftherios C.
  • Mavropoulos, George C.

Abstract

This study is founded on previously validated, in-house, comprehensive, two-zone, quasi-dimensional combustion model, predicting performance and emissions in spark-ignition engines. The model is extended to include exergy terms complementing the first-law analysis results, which provide further useful information by implementation on test results acquired from an experimental, Ricardo E6, variable compression ratio (VCR) gasoline engine at the authors’ laboratory, operated under various CR and equivalence ratio (EQR) values at wide-open throttle. The model consists of unburned and burned zones simulating the combustion process, following strictly the flame-front movement in combustion chamber. The eventual combustion of the unburned mixture turbulent entrainment into burned zone through the flame-front area is followed closely. The exergy terms of each simulated zone are identified and computed, considering also chemical exergy components (diffusion plus reactive). The accurate account of temperature and species histories in burned zone after entrainment from the unburned one, should lead to more precise evaluation. This is important if irreversibility is computed from balance of all other exergy terms. The investigation examines and compares exergy-wise various EQR, CR and residual gas fractions. Presented diagrams of exergy terms for each zone and cylinder charge provide detailed information for chemical exergy, irreversibility and exergy losses.

Suggested Citation

  • Rakopoulos, Constantine D. & Rakopoulos, Dimitrios C. & Kyritsis, Dimitrios C. & Andritsakis, Eleftherios C. & Mavropoulos, George C., 2022. "Exergy evaluation of equivalence ratio, compression ratio and residual gas effects in variable compression ratio spark-ignition engine using quasi-dimensional combustion modeling," Energy, Elsevier, vol. 244(PB).
    • Handle: RePEc:eee:energy:v:244:y:2022:i:pb:s0360544221033296
    DOI: 10.1016/j.energy.2021.123080
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    References listed on IDEAS

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    1. Rakopoulos, Constantine D. & Rakopoulos, Dimitrios C. & Kosmadakis, George M. & Papagiannakis, Roussos G., 2019. "Experimental comparative assessment of butanol or ethanol diesel-fuel extenders impact on combustion features, cyclic irregularity, and regulated emissions balance in heavy-duty diesel engine," Energy, Elsevier, vol. 174(C), pages 1145-1157.
    2. Rakopoulos, Dimitrios C. & Rakopoulos, Constantine D. & Kosmadakis, George M. & Giakoumis, Evangelos G., 2020. "Exergy assessment of combustion and EGR and load effects in DI diesel engine using comprehensive two-zone modeling," Energy, Elsevier, vol. 202(C).
    3. Giakoumis, Evangelos G. & Rakopoulos, Dimitrios C. & Rakopoulos, Constantine D., 2016. "Combustion noise radiation during dynamic diesel engine operation including effects of various biofuel blends: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 1099-1113.
    4. Rakopoulos, Constantine D. & Rakopoulos, Dimitrios C. & Mavropoulos, George C. & Kosmadakis, George M., 2018. "Investigating the EGR rate and temperature impact on diesel engine combustion and emissions under various injection timings and loads by comprehensive two-zone modeling," Energy, Elsevier, vol. 157(C), pages 990-1014.
    5. Rakopoulos, C.D & Kyritsis, D.C, 2001. "Comparative second-law analysis of internal combustion engine operation for methane, methanol, and dodecane fuels," Energy, Elsevier, vol. 26(7), pages 705-722.
    6. Feng, Hongqing & Liu, Daojian & Yang, Xiaoxi & An, Ming & Zhang, Weiwen & Zhang, Xiaodong, 2016. "Availability analysis of using iso-octane/n-butanol blends in spark-ignition engines," Renewable Energy, Elsevier, vol. 96(PA), pages 281-294.
    7. Rakopoulos, C.D. & Michos, C.N. & Giakoumis, E.G., 2008. "Availability analysis of a syngas fueled spark ignition engine using a multi-zone combustion model," Energy, Elsevier, vol. 33(9), pages 1378-1398.
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    Cited by:

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    2. Wang, Yi & He, Guanzhang & Huang, Haozhong & Guo, Xiaoyu & Xing, Kongzhao & Liu, Songtao & Tu, Zhanfei & Xia, Qi, 2023. "Thermodynamic and exergy analysis of high compression ratio coupled with late intake valve closing to improve thermal efficiency of two-stage turbocharged diesel engines," Energy, Elsevier, vol. 268(C).
    3. Divekar, Prasad & Han, Xiaoye & Zhang, Xiaoxi & Zheng, Ming & Tjong, Jimi, 2023. "Energy efficiency improvements and CO2 emission reduction by CNG use in medium- and heavy-duty spark-ignition engines," Energy, Elsevier, vol. 263(PB).
    4. Rakopoulos, Constantine D. & Rakopoulos, Dimitrios C. & Kosmadakis, George M. & Zannis, Theodoros C. & Kyritsis, Dimitrios C., 2023. "Studying the cyclic variability (CCV) of performance and NO and CO emissions in a methane-run high-speed SI engine via quasi-dimensional turbulent combustion modeling and two CCV influencing mechanism," Energy, Elsevier, vol. 272(C).
    5. Theodoros C. Zannis & John S. Katsanis & Georgios P. Christopoulos & Elias A. Yfantis & Roussos G. Papagiannakis & Efthimios G. Pariotis & Dimitrios C. Rakopoulos & Constantine D. Rakopoulos & Athanas, 2022. "Marine Exhaust Gas Treatment Systems for Compliance with the IMO 2020 Global Sulfur Cap and Tier III NO x Limits: A Review," Energies, MDPI, vol. 15(10), pages 1-49, May.

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