| Numerical Investigation on Laminar Burning Velocity and Flame Temperature Characteristics of Dedicated EGR SI Engine Fueled with Methane and Propane Under Different Equivalence Ratio |
| Sejun Lee1, Norimasa Iida2, Ocktaeck Lim3 |
1Research Center for Next Generation Vessel with Hydrogen Fuel Cell, University of Ulsan, DaeHak-ro 93, Nam-gu, Ulsan, 44610, South Korea
2The Graduate School of Science and Technology, Keio University, 2-15-45 Mita, Minato-ku, Tokyo, 108-8345, Japan
3School of Mechanical Engineering, University of Ulsan, DaeHak-ro 93, Nam-gu, Ulsan, 44610, South Korea |
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Received: October 15, 2024; Revised: December 2, 2024 Accepted: December 3, 2024. Published online: February 28, 2025. |
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| ABSTRACT |
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The laminar flame velocity is a significant metric in premixed combustion modeling of spark ignition (SI) engines. The present investigation was conducted to determine the chance of a dedicated EGR (d-EGR) system being added to a four-cylinder SI engine to increase thermal efficiency, which might be reduced owing to the high EGR ratio for reducing in-cylinder NOx generation by lowering the combustion temperature. Methane and propane were chosen as the test fuels. The numerical findings predicted by the PREMIX algorithm in CHEMKIN-PRO were used to determine flame temperature (Tf) and laminar burning velocity (SL). The laminar burning velocities acquired at varied beginning pressures are required for conducting a thorough kinetic investigation of the combustion reaction and testing the actual reaction mechanisms. Thermal efficiency was calculated using the Wocshni’s heat transfer coefficient and Wiebe function. The findings reveal that the d-EGR mechanism boosted thermal efficiency, surpassing that of the typical SI engine’s stoichiometric combustion due to the low flame temperature and fast laminar burning velocity. These findings give essential theoretical references for enhancing the thermal efficiency of SI engines powered by methane and propane fuel. |
| Key Words:
Dedicated EGR · Thermal efficiency · Laminar burning velocity · Flame temperature · Chemkin-pro |
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Corresponding Author.
Ocktaeck Lim , Email. 
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