摘要：针对某2.0 L增压直喷汽油机，设计了2种进气道方案，通过试制进气道芯盒，采用气道三维粒子图像测速（threedimensional particle image velocimetry，3DPIV）试验与三维仿真相结合的方式，分析进气道性能及进气道对缸内流动的影响。结果表明：进气道切入角是气道开发的关键参数，合适的切入角可以提高进气道滚流比，燃烧室进气门遮蔽面能大幅提高小升程下的滚流比；内外切入角为0°的进气道性能更优，平均流量系数和平均滚流比分别为0.264、3.2，满足进气道性能开发目标；且与燃烧室、活塞顶匹配更好，可以获得较高的缸内瞬态滚流、湍动能及更合理的湍动能分布。
Abstract:Two intake port schemes are designed for a 2.0 L turbocharged direct injection gasoline engine. In combination with intake port core box, 3DPIV test and 3D simulation are used to evaluate the performance of intake port and the influence of intake port on incylinder flow. The results show that the entry angles are key parameters in the design of intake port, appropriate entry angle improving the tumble ratio, and the shrouded surface of the inlet valve in the combustion chamber can significantly improve the tumble ratio at small valve lift. The intake port with 0° entry angle has better performance, and the average flow coefficient and average tumble ratio are 0.264 and 3.2 respectively, which is well matched with the combustion chamber and piston crown. Higher transient tumble in cylinder and turbulent kinetic energy are achieved, as well as better distribution of turbulent kinetic energy.
Keywords:gasoline engine; intake port; 3DPIV；tumble ratio；incylinder flow