Numerical Study on Optimizing Combustion Dynamics in Hydrogen Internal Combustion Engines: A Comprehensive Study on Air-Fuel Ratios and Manifold Air Pressures Numerical Investigation of Air-Fuel Equivalence Ratios and Manifold Air Pressure Effects on Performance and Combustion Characteristics
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Abstract
The transition to sustainable energy solutions is essential for mitigating global climate challenges. This study provides a detailed examination of the combustion dynamics in hydrogen internal combustion engines (H2ICEs), an important technology for achieving zero-carbon mobility. Through advanced numerical simulations in OpenModelica, the study investigates the influence of air-fuel ratios ( ) and manifold air pressures ( ) on combustion characteristics, including mass fraction burned, indicated mean effective pressure ( ), and combustion progression. The analysis spans equivalence ratios from 1.3 to 2.7 and manifold pressures ranging from 85 to 135 kPa. The results demonstrate how variations in air-fuel ratio and manifold pressure critically affect engine performance, thermal efficiency, and potential emissions. The study provides valuable insights into hydrogen combustion behavior, highlighting the need for precise mixture control to optimize engine efficiency and emissions. These findings contribute significantly to advancing hydrogen-powered propulsion systems, offering practical guidance for the development of clean energy technologies aimed at sustainable transportation.
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