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Turbulent Jet Ignition of Premixed Methane Air mixture with Hydrogen Enrichment

This study is motivated to understand the efficacy of turbulent jet ignition in pure premixed methane-air mixture along with hydrogen blending. The simplified three-dimensional numerical simulations are proposed to perform in high-pressure cylindrical domain attached with pre-chamber domain. The fuel-air mixture will be ignited in pre-chamber first and the flame propagation from pre-chamber to main cylindrical domain will occur through small diameter channels. This will produce the turbulent jet in the main chamber, which may provide ignition to the mixture in main chamber efficiently. The higher surface area of turbulent jet in main chamber (in comparison to spark ignition) leads to efficient ignition of lean and ultra-lean mixture [1]. Blending of hydrogen to fuel-air mixture in any combustion engine has been found helpful in increasing ultra-lean operation range. Hence, it may be beneficial to understand the effectiveness of turbulent jet ignition on hydrogen blend fuel-air mixture, which may provide better combustion efficiency as well as may lead to overall lesser NOx emissions. The numerical solver CONVERGE v3.0 will be used in this study to solve the reactive flows. It has powerful automated grid refinement and SAGE chemistry solver to handle various regimes of ignition and extinction. It is proposed to use finite-rate chemistry with reduced chemical kinetic mechanism DRM22 for premixed methane-air as well as hydrogen enriched mixture. In this study, the methane-air mixture of lean equivalence ratios of ϕ=0.4-0.5 will be enriched by hydrogen up to 40 % by volume at 5 bar pressure fir various simulation cases. Overall, the objectives of this study can be summarized as: 1) Perform unsteady three-dimensional numerical simulation of turbulent jet ignition of high-pressure methane-air mixture at lean equivalence ratios, 2) Perform the similar simulations for hydrogen enriched premixed mixture to understand the effects of turbulent jet ignition on the same. Key words: CFD, Premixed Combustion, Spark Ignition, Turbulent Jet Ignition, Pre-chamber Bibliography [1] BISWAS, S., TANVIR, S., WANG, H., QIAO, L., On ignition mechanisms of premixed CH4/air and H2/air using a hot turbulent jet generated by pre-chamber combustion, Applied Thermal Engineering, 2016, 106, 925-937. [2] ATTARD, W. P., FRASER, N., PARSONS, P., TOULSON, E., A turbulent jet ignition pre-chamber combustion system for large fuel economy improvements in a modern vehicle powertrain, 2010, SAE International Journal of Engines, 3 (2010-01- 1457), pp. 20-37. [3] Muller, M, Freeman, C, Zhao, P, & Ge, H. Numerical Simulation of Ignition Mechanism in the Main Chamber of Turbulent Jet Ignition System, 2018, Proceedings of the ASME 2018 Internal Combustion Engine Division Fall Technical Conference. San Diego, California, USA. November 4–7, 2018. V002T06A010. ASME.
Topic: Engine combustion
Author: Ashish VASHISHTHA
Co-authors: Rathinam BALAMURUGAN, Dean CALLAGHAN, Cathal NOLAN