Email this article Effect of Compression Ratio on the Performance of Direct-Injection Hydrogen Engines
Abstract
Direct injection of hydrogen into the cylinder can avoid abnormal combustion such as backfire, and the hydrogen engine can operate in a wider range of excess air coefficient. However, direct injection hydrogen engines still have problems such as high NOx emissions under high load conditions, reduced power output due to lean combustion, and low thermal efficiency. This paper adopts a variable compression ratio structural design to study the impact of compression ratio changes on the comprehensive performance of direct injection hydrogen engines. The results show that under the same working conditions, as the engine compression ratio increases, the turbulence in the engine cylinder becomes more intense, increasing the back pressure in the cylinder, inhibiting the diffusion of hydrogen, making the hydrogen distribution more concentrated and the combustion conditions in the cylinder better. The overall performance of the engine is significantly improved.
Citation: Xu, Z. (2024). Effect of compression ratio on the performance of direct-injection hydrogen engines. Trends in Renewable Energy, 10(3), 283-300. doi:http://dx.doi.org/10.17737/tre.2024.10.3.00178
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DOI: http://dx.doi.org/10.17737/tre.2024.10.3.00178
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