1. Optimization of injection system for a medium-speed four-stroke spark-ignition marine hydrogen engine.
- Author
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Qu, Wenjing, Fang, Yuan, Wang, Zixin, Sun, Hongjie, and Feng, Liyan
- Subjects
- *
SPARK ignition engines , *MARINE engines , *MATHEMATICAL optimization , *DIESEL motors , *TURBULENCE , *HOMOGENEITY - Abstract
In order to avoid the abnormal combustion in high-power hydrogen engine, a 3D CFD numerical model of a direct-injection spark-ignition hydrogen engine was built up based on a large-bore medium-speed four-stroke marine diesel engine using CONVERGE software. To obtain the influence of injection parameters on mixture homogeneity, a dimension reduction optimization method was proposed. The results revealed that the turbulence intensity and the penetration distance varied with the injection parameters, determined the level of mixture homogeneity. The performance comparison between the hydrogen engine and prototype diesel engine showed a great potential of hydrogen in internal combustion (IC) engines. • Process of improving homogeneity can be simplified by optimizing turbulence intensity and injection penetration distance. • Turbulence intensity and injection penetration distance varied with injection system parameters. • The higher the turbulence intensity, the faster the mixing rate. • Neither too long nor too short injection penetration distance was conducive to mixing. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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