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Fluids 2018, 3(2), 24; https://doi.org/10.3390/fluids3020024

Numerical Study of Natural Gas/Diesel Reactivity Controlled Compression Ignition Combustion with Large Eddy Simulation and Reynolds-Averaged Navier–Stokes Model

1
Vehicle Powertrain System Research Laboratory, School of Automotive Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran
2
Aerothermochemistry and Combustion Systems Laboratory, Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland
*
Author to whom correspondence should be addressed.
Received: 12 February 2018 / Revised: 20 March 2018 / Accepted: 24 March 2018 / Published: 28 March 2018
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Abstract

In the current study, a comparative study is performed using Large Eddy Simulation (LES) and Reynolds-averaged Navier–Stokes (RANS) turbulence models on a natural gas/diesel Reactivity Controlled Compression Ignition (RCCI) engine. The numerical results are validated against the available research work in the literature. The RNG (Re-Normalization Group) k ε and dynamic structure models are employed to model turbulent flow for RANS and LES simulations, respectively. Parameters like the premixed natural gas mass fraction, the second start of injection timing (SOI2) of diesel and the engine speed are studied to compare performance of RANS and LES models on combustion and pollutant emissions prediction. The results obtained showed that the LES and RANS model give almost similar predictions of cylinder pressure and heat release rate at lower natural gas mass fractions and late SOI2 timings. However, the LES showed improved capability to predict the natural gas auto-ignition and pollutant emissions prediction compared to RANS model especially at higher natural gas mass fractions. View Full-Text
Keywords: reactivity controlled compression ignition (RCCI); large eddy simulation (LES); Reynolds-averaged Navier–Stokes (RANS); natural gas; pollutants reactivity controlled compression ignition (RCCI); large eddy simulation (LES); Reynolds-averaged Navier–Stokes (RANS); natural gas; pollutants
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kakaee, A.-H.; Jafari, P.; Paykani, A. Numerical Study of Natural Gas/Diesel Reactivity Controlled Compression Ignition Combustion with Large Eddy Simulation and Reynolds-Averaged Navier–Stokes Model. Fluids 2018, 3, 24.

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