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| Simulation Analysis of In-Cylinder Combustion Characteristics of a Mirror-Opposed Gasoline Engine |
| DOI：10.13949/j.cnki.nrjgc.2025.02.007 |
| Key Words:mirror-opposed cylinder Scotch yoke gasoline engine combustion simulation |
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| Abstract:The Scotch yoke mechanism was utilized to replace the crank mechanism， and the mirroring and opposition arrangement of cylinders in a gasoline engine was achieved. To analyze the combustion characteristics within the cylinder， 1-dimensional and 3-dimensional simulation models were constructed based on the mirror-opposed gasoline engine that meets the China 6b emission standard. Based on these models， a comparative analysis was conducted to examine the impact of the Scotch yoke mechanism and the crank mechanism on the in-cylinder combustion process of gasoline engine. The results show that the Scotch yoke mechanism exhibits superior piston dynamics， with balanced fluctuations in piston acceleration， leading to smoother operation and enhanced volumetric efficiency near top dead center （TDC）. During the intake phase， the higher degree of in-cylinder gas compression in the Scotch yoke mechanism results in a reduced intake driving pressure difference， causing the intake air mass at the calibration point to decrease by approximately 5% compared to the crank mechanism， underscoring the necessity of technological advancements to compensate for the intake air mass loss. When the intake air mass is the same， the Scotch yoke mechanism significantly accelerates the mid-to-late stages of the mixture combustion process through its enhanced volumetric efficiency near TDC， shortening the combustion duration at the calibration point by 25%. In contrast， the crank length of the crank mechanism has a limited impact on the gas exchange and combustion processes， although a short crank length design exhibits certain advantages under specific conditions. |
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