Influence of In-Cylinder Turbulence Kinetic Energy on the Mixing Uniformity within Gaseous-Fuel Engines under Various Intake Pressure Conditions
Tianbo Wang (wangtianbo@jsut.edu.cn),
Yu Wang,
Lanchun Zhang,
Yan Zheng,
Ranran Liu,
Chengmin Wang and
Wu Gong
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Tianbo Wang: Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China
Yu Wang: Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China
Lanchun Zhang: Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China
Yan Zheng: Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China
Ranran Liu: Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China
Chengmin Wang: Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China
Wu Gong: Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China
Energies, 2024, vol. 17, issue 13, 1-13
Abstract:
To explore the potential for further enhancing the gas mixing uniformity of natural gas (NG) engines, this paper identifies turbulent kinetic energy (TKE), which has an essential impact on gas mixing, as the entry point of the research. After establishing a computational fluid dynamics (CFD) model for NG engines’ direct injection and mixing processes, the inlet pressure is selected as the experimental variable to investigate the influence of TKE on gas mixing uniformity. In particular, by proposing the theoretical concept of the core mixing stage, the numerical variation rule between the best mixture concentration region (BMCR) percentage and the mean turbulent kinetic energy (MTKE) of the core mixing stage is analyzed under certain injection timing conditions. The results indicate that, with identical intake pressures, an advanced gas injection timing elevates the total turbulence kinetic energy (TTKE) during the core mixing stage, thereby amplifying the uniformity of the gas mixture at the ignition. In specific scenarios, as the intake pressure increases, the decreasing trend in the BMCR proportion closely resembles the diminishing trend in the MTKE during the core mixing stage. Scrutinizing the variation trend in either parameter allows for an approximate prediction of the variation trend in the other parameter. When the intake pressure is gradually raised from the naturally aspirated state, the adequacy of the gas jet development is progressively reduced by the increasing back pressure in the cylinder.
Keywords: natural gas engine; turbulent kinetic energy; mixing uniformity; inlet pressure; core mixing stage (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: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:17:y:2024:i:13:p:3321-:d:1430168
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