活塞环槽-环组结构对漏气量的影响

Effect of Piston Ring Grooves-ring Group Structure on Blow-by

为了降低活塞环槽处的窜气量,增加环的密封性能,进一步提高柴油机整体性能,通过ANSYS计算得到了活塞及缸套在热变形下的轮廓曲线,基于AVL Glide软件,建立了正确的活塞-活塞环-缸套模型,并提出了活塞环结构优化方案。运用Glide模型分析了活塞组结构参数(背隙、侧隙、活塞环槽形状和活塞环形状)对漏气量的影响规律。研究表明,侧隙和背隙的增大导致漏气量增加,但是变化不太显著。改变活塞环槽-环组上表面结构对漏气量没有明显的影响,在设计活塞环槽-环组的上下表面时建议采用平面。

In order to reduce piston ring blow-by, increase the sealing performance of the ring, to further improve the overall performance of the diesel engine, thermal deformation outline curve of the piston and cylinder liner outline curve is obtained by calculation of ANSYS. Based on AVL Glide software, a correct the piston-piston ring-liner model is established and the structure optimization program of piston ring is proposed. Glide model analysis using a set of structural parameters of the piston（backlash, backlash, piston rings and piston ring groove shape shape） influence of the amount of leakage. Studies show that the increase of side clearance and back clearance leads to the increase of air leakage, while the change is not significant. The change of the upper and lower surfaces in piston ring grooves- ring group lead to the strengthen of blow-by, so the design of the upper and lower surfaces in piston ring grooves- ring group is used plane.