Numerical Investigation of Compression Ratio Impact on Performance, Combustion, and Emissions Behavior of a Hydrogen-Powered Internal Combustion Engine

This article investigates the impact of varying compression ratios on the performance, combustion, and emissions characteristics of a hydrogen-fueled internal combustion engine (ICE). The study employs numerical simulations using OpenModelica, an open-source modeling and simulation platform based on the Modelica language. The analysis focuses on three different compression ratios (8:1, 9:1, and 10:1) and examines parameters such as brake power, NOx concentration, and brake thermal efficiency. The results demonstrate that increasing the compression ratio leads to higher peak brake power and NOx emissions, while also improving brake thermal efficiency over a certain power range. The findings highlight the trade-offs between engine performance, efficiency, and emissions, which can inform the design and optimization of hydrogen-fueled ICEs for various applications.