Water Vapor Blending Ratio Effects on Combustion Thermal Performance and Emission of Hydrogen Homogeneous Charge Compression Ignition

Wenhua Yuan (), Xueliang Huang, Jun Fu (), Yi Ma, Guangming Li and Qike Huang
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Wenhua Yuan: School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China
Xueliang Huang: School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China
Jun Fu: School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China
Yi Ma: School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China
Guangming Li: School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China
Qike Huang: School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China

Energies, 2022, vol. 15, issue 23, 1-16

Abstract: A numerical model of the micro-free-piston engine was developed and its correctness was verified by the comparison between the simulation and referential experiment results under the same work conditions. Based on this numerical model, the effects of the water vapor blending ratio ( α ) on combustion thermal performance and emission characteristics of hydrogen (H 2 ) homogeneous charge compressing ignition (HCCI) were investigated numerically. The water vapor impact on combustion temperature was analyzed as well. The simulation results reveal that when the initial equivalent ratio is 0.5, blending H 2 with water vapor can delay the ignition time and prolong the whole process. At the same time, the addition of water vapor to H 2 decreases the peak combustion temperature and pressure, which will alleviate the detonation phenomenon of the combustion chamber. Moreover, the power output capacity and NO x emissions decrease with the increase in α . When α increases to 0.8, the mixture gas cannot be compressed to ignite. Finally, the dilution effect, thermal effect, and chemical effect of water vapor all have the potential to lower the combustion temperature and the dilution effect plays the leading role.

Keywords: hydrogen; water vapor; free piston; homogeneous charge compression ignition; NO x emission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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