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Combustion modeling in RCCI engines with a hybrid characteristic time combustion and closed reactor model

Author

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  • Zhou, Dezhi
  • Yang, Wenming
  • Li, Jing
  • Tay, Kun Lin
  • Kraft, Markus

Abstract

This study proposed a hybrid model consisting of a characteristic time combustion (CTC) model and a closed reactor model for the combustion modelling with detailed chemistry in RCCI engines. In the light of the basic idea of the CTC model of achieving chemical equilibrium in high temperature, this hybrid model uses the CTC model to solve the species conversion and heat release in the diffusion flame. Except for the diffusion flame, the auto-ignition in RCCI combustion is computed by a closed reactor model with the CHEMKIN library by assuming that the computational cells are closed reactors. The border of the transition between the CTC model and closed reactor model is determined by two criteria, a critical temperature and a critical Damköhler number. On the formulation of this hybrid model, emphasis is placed on coupling detailed chemistry into this hybrid model. A CEQ solver for species equilibrium calculations at certain temperature, pressure was embedded with CTC for detailed chemistry calculation. Then this combustion model was integrated with the CFD framework KIVA4 and the chemical library CHEMKIN-II and validated in a RCCI engine. The predicted in-cylinder pressure and heat release rate (HRR) show a good consistency with the data from the experiment and better accuracy than that computed from the sole closed reactor model. More importantly, it is observed that this model could save computational time compared with closed reactor model due to less stiff ordinary differential equations (ODEs) computation. A sensitivity analysis of the critical temperature and critical Damköhler number was conducted to demonstrate the effect of these two parameters in the current model.

Suggested Citation

  • Zhou, Dezhi & Yang, Wenming & Li, Jing & Tay, Kun Lin & Kraft, Markus, 2018. "Combustion modeling in RCCI engines with a hybrid characteristic time combustion and closed reactor model," Applied Energy, Elsevier, vol. 227(C), pages 665-671.
    • Handle: RePEc:eee:appene:v:227:y:2018:i:c:p:665-671
    DOI: 10.1016/j.apenergy.2017.08.137
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    References listed on IDEAS

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    1. Li, Yaopeng & Jia, Ming & Chang, Yachao & Liu, Yaodong & Xie, Maozhao & Wang, Tianyou & Zhou, Lei, 2014. "Parametric study and optimization of a RCCI (reactivity controlled compression ignition) engine fueled with methanol and diesel," Energy, Elsevier, vol. 65(C), pages 319-332.
    2. Zhou, D.Z. & Yang, W.M. & An, H. & Li, J., 2015. "Application of CFD-chemical kinetics approach in detecting RCCI engine knocking fuelled with biodiesel/methanol," Applied Energy, Elsevier, vol. 145(C), pages 255-264.
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