Effect of Intake Port and Combustion Chamber on Performance of Miller Cycle Engine
Based on the CONVERGE software,the influence of medium and high tumble intake port and squish structure on the flow field and combustion characteristics in the cylinder is compared and analyzed,and the simulation and test trends are more consistent.The results show that under the condition of 2500rpm 1.2 MPa,compared with the high tumble port,the in-cylinder flow field of the middle tumble ratio port and the squish scheme becomes stronger,the combustion characteristics become better,and the fuel consumption is re-duced by 0.5%and 2.13%respectively.Under the condition of 6000rpm 1.5 MPa,the flow field and combus-tion of the middle tumble port become worse,and the power is reduced by 2.2%,while the flow field of the squishing scheme is relatively small,and the flow field distribution is relatively good,and the knocking tendency becomes better,the combustion phase is advanced and the power is increased by 4.17%.
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