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| Experimental Research on Cylinder-to-Cylinder Combustion Consistency of Equivalent Natural Gas Engine |
| DOI：10.13949/j.cnki.nrjgc.2023.01.008 |
| Key Words:equivalent combustion natural gas engine combustion consistency exhaust gas recirculation（EGR） intake mode |
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| Abstract:In order to study the effect of exhaust gas recirculation（EGR） and intake mode on the combustion characteristics of the equivalent combustion natural gas engine， the effects of CO2 and the water vapor contained in EGR， as well as the intake modes including right-hand side and middle intakes on the combustion consistency of each cylinder of an equivalent combustion natural gas engine were investigated. The test results show that the introduction of EGR gas was an important factor affecting the combustion consistency of each cylinder of the equivalent natural gas engine under the current right-hand side intake mode， especially the distribution of the water vapor contained in the EGR gas in each cylinder. After removing water vapor from EGR exhaust gas， the maximum cylinder pressure deviation value of each cylinder was reduced from 9.5% to 4.1%. When EGR gas was not introduced， the maximum cylinder pressure deviation value of each cylinder was decreased further from 4.1% to 2.3%. Based on the problems existing in the current right-hand side intake method with the introduction of EGR gas， the newly designed intermediate air intake method effectively improved the distribution of EGR gas in each cylinder， thereby significantly improving the combustion consistency and the maximum cylinder pressure deviation value of each cylinder. The maximum cylinder pressure deviation value of each cylinder in the original right-hand side intake mode was reduced from 9.5% to 2.0%， which effectively solved the problem of combustion inconsistency of each cylinder. |
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