VIRTUAL SIMULATION OF THE EFFECT OF HYDROGEN ADDITION ON THE COMBUSTION PROCESS IN SPARK-IGNITION ENGINE
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Keywords: hydrogen enrichment, CFD simulation, ANSYS Fluent, combustion process, gasoline engine, Cobalt engine, thermal efficiency.Abstract
Hydrogen enrichment of gasoline engines has emerged as a promising pathway toward improving combustion efficiency and reducing greenhouse gas emissions. This study investigates the influence of 15% hydrogen addition on the combustion characteristics of a Chevrolet Cobalt 1.5 L spark-ignition engine using Computational Fluid Dynamics (CFD) simulation in ANSYS Fluent. A three-dimensional combustion chamber model was developed to analyze pressure evolution, temperature distribution, flame propagation, and heat release characteristics under identical operating conditions. Numerical results indicate that hydrogen addition significantly accelerates combustion, increases peak cylinder pressure, shortens combustion duration, and improves thermal efficiency. The maximum in-cylinder pressure increased from 8.96 MPa to 10.47 MPa, while combustion duration decreased by approximately 12.4%. The results demonstrate that hydrogen-enriched combustion can serve as an effective transitional technology for reducing fossil fuel consumption and improving engine performance.
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