内燃机增压与扩缸对活塞横向运动影响的数值分析

根据活塞动力学方程与平均雷诺方程建立分析模型,采用 Broyden法对模型求解.依据 6105 柴油机燃烧爆发压力提高38%和缸径从105 mm扩大到 110 mm的改进设计,分析活塞的横向运动特性.结果表明:进行上述改进设计后,活塞顶部横向偏移的幅值增加了 23%,活塞横向运动速度的峰值增加了 22%,增大了擦缸的可能性;活塞横向运动加速度的峰值增加了38%,加剧了活塞对气缸的冲击.这样的分析结果对完善内燃机产品设计具有有效的指导作用.

Numerical Analysis to Influence of Turbocharging and Cylinder Diameter Enlargement on Piston Transverse Movement

The analytical model was established based on piston dynamics and average Reynolds equations and than solved by Broyden method. The piston transverse movement characteristics were analysed according to the improved design of 6105 engine in which the explosive pressure was augmented by 38% and the cylinder diameter was enlarged from 105 mm to 110 mm. The piston top eccentricity and transverse velocity peak value are enlarged by 23% and 22% in the improved design, respectively, which increase the possibility of scraping cylinder. The piston transverse acceleration peak value is raised by 38%, which brings (about) stronger shock to cylinder. These results will give an effective direction to perfection of product (design) of internal combustion engine.