This project utilizes a 1.5 L naturally aspirated gasoline engine for valve mechanism modification to achieve Miller cycle.Based on one-dimensional software calculation,different cam profiles are selected to study the differences in achieving fuel consumption and rated torque performance goals of the new engine through dif-ferent schemes.Using three-dimensional CFD software,establish a cylinder flow model for selecting a valve combination scheme,calculate the flow field distribution,and calculate the flow field and turbulent kinetic ener-gy near the spark plug;Calculate the combustion pressure and temperature field distribution inside the cylinder,providing necessary computational fluid dynamics inputs for development tests.In addition,with the help of a performance test bench,performance development tests were conducted on the modified prototype to verify the actual benefits,and ultimately a selection plan that met the design objectives was achieved.
维普
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