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Mixing and evaporation analysis of a high-pressure SCR system using a hybrid LES-RANS approach

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  • Kaario, Ossi Tapani
  • Vuorinen, Ville
  • Zhu, Lei
  • Larmi, Martti
  • Liu, Ronghou

Abstract

A hybrid Large Eddy Simulation (LES) – Reynolds-Averaged Navier-Stokes (RANS) method (HLR) has been applied to simulate an engine related selective catalytic reduction (SCR) system. Typical SCR systems utilize low pressure urea injection together with a mixer for vapor field homogenization. Simultaneously, it is also desirable to reduce spray-wall interaction to avoid urea crystallization. The present study considers an SCR system where a high pressure (150 bar) urea spray is injected towards hot exhaust gases in exhaust pipe. The system has been shown to work well in a previous experimental study but detailed characterization of the system is missing. The novelty of the present study rises from: 1) the creation of phase diagrams with single droplet simulations that predict the optimum operation regions for the SCR system, 2) validation of the HLR method in a high Reynolds number (Re=49,900) compressible pipe flow, 3) the use of HLR simulations in an engine SCR system for the first time, and 4) the detailed characterization of the present SCR system. As a result of the study, new non-dimensional timescale ratios are proposed to link the droplet size and liquid injection velocity to the exhaust pipe dimensions in future SCR systems.

Suggested Citation

  • Kaario, Ossi Tapani & Vuorinen, Ville & Zhu, Lei & Larmi, Martti & Liu, Ronghou, 2017. "Mixing and evaporation analysis of a high-pressure SCR system using a hybrid LES-RANS approach," Energy, Elsevier, vol. 120(C), pages 827-841.
    • Handle: RePEc:eee:energy:v:120:y:2017:i:c:p:827-841
    DOI: 10.1016/j.energy.2016.11.138
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    References listed on IDEAS

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    1. Sarjovaara, Teemu & Alantie, Jussi & Larmi, Martti, 2013. "Ethanol dual-fuel combustion concept on heavy duty engine," Energy, Elsevier, vol. 63(C), pages 76-85.
    2. Keskinen, Karri & Kaario, Ossi & Nuutinen, Mika & Vuorinen, Ville & Künsch, Zaira & Liavåg, Lars Ola & Larmi, Martti, 2016. "Mixture formation in a direct injection gas engine: Numerical study on nozzle type, injection pressure and injection timing effects," Energy, Elsevier, vol. 94(C), pages 542-556.
    3. Varna, Achinta & Spiteri, Alexander C. & Wright, Yuri M. & Dimopoulos Eggenschwiler, Panayotis & Boulouchos, Konstantinos, 2015. "Experimental and numerical assessment of impingement and mixing of urea–water sprays for nitric oxide reduction in diesel exhaust," Applied Energy, Elsevier, vol. 157(C), pages 824-837.
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    Cited by:

    1. Kapusta, Łukasz Jan, 2022. "Understanding the collapse of flash-boiling sprays formed by multi-hole injectors operating at low injection pressures," Energy, Elsevier, vol. 247(C).
    2. Kaushal Nishad & Marcus Stein & Florian Ries & Viatcheslav Bykov & Ulrich Maas & Olaf Deutschmann & Johannes Janicka & Amsini Sadiki, 2019. "Thermal Decomposition of a Single AdBlue ® Droplet Including Wall–Film Formation in Turbulent Cross-Flow in an SCR System," Energies, MDPI, vol. 12(13), pages 1-25, July.
    3. Rogóż, Rafał & Kapusta, Łukasz Jan & Bachanek, Jakub & Vankan, Joseph & Teodorczyk, Andrzej, 2020. "Improved urea-water solution spray model for simulations of selective catalytic reduction systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 120(C).
    4. Giovanni Di Ilio & Vesselin K. Krastev & Giacomo Falcucci, 2019. "Evaluation of a Scale-Resolving Methodology for the Multidimensional Simulation of GDI Sprays," Energies, MDPI, vol. 12(14), pages 1-13, July.
    5. Mahmoud Gadalla & Jeevananthan Kannan & Bulut Tekgül & Shervin Karimkashi & Ossi Kaario & Ville Vuorinen, 2020. "Large-Eddy Simulation of ECN Spray A: Sensitivity Study on Modeling Assumptions," Energies, MDPI, vol. 13(13), pages 1-24, July.

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