Modeling the Performance of the Piston Ring-pack with Consideration of Non-axisymmetric Characteristics of the Power Cylinder System in Internal Combustion Engines
Author | : Liang Liu |
Publisher | : |
Total Pages | : 143 |
Release | : 2005 |
ISBN-10 | : OCLC:61126273 |
ISBN-13 | : |
Rating | : 4/5 ( Downloads) |
Download or read book Modeling the Performance of the Piston Ring-pack with Consideration of Non-axisymmetric Characteristics of the Power Cylinder System in Internal Combustion Engines written by Liang Liu and published by . This book was released on 2005 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) This model predicts the inter-ring gas pressure and 3-D displacements of the three rings at various circumferential locations. Model results show significant variations of the dynamic behavior along ring circumference. In the ring-pack lubrication model, an improved flow continuity algorithm is implemented in the ring/liner hydrodynamic lubrication, and proves to be very practicable. By coupling the ring/liner lubrication with the in-plane structural response of the ring, the lubrication along the entire ring circumference can be calculated. Model results show significant variations of lubrication along the circumference due to the non-axisymmetric characteristics of the power cylinder system. Bore distortion was found to have profound effects on oil transport along the liner. Particularly, it stimulates the occurrence of oil up-scraping by the top ring during compression stroke. Because the oil evaporation on the liner affects the liner oil film thickness, a sub-model for liner evaporation with consideration of multi-species oil is incorporated with the lubrication model. With consideration of oil transport along the liner, the prediction of evaporation is more precise. The combination of these models is a complete package for piston ring-pack analysis. It is computationally robust and efficient, and thus has appreciable practical value.