Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6635237 | Fuel | 2015 | 9 Pages |
Abstract
The performance of gasoline direct injection (GDI) engine is simulated using the AVL-FIRE code. The effects of four piston shapes on mixture formation and combustion are compared and analyzed. For GDI engines with forward tumble and multihole high-pressure injector, a piston with flat top surface and pit is beneficial for the maintenance of in-cylinder turbulence intensity. Such structure aids in the formation of a combustible mixture around the spark plug at the time of ignition. A piston with a smoother top surface strengthens the turbulence kinetic energy at the time of ignition, thereby accelerating combustion and increasing in-cylinder temperature and pressure. The higher in-cylinder temperature and pressure promote NO emission, whereas soot emission decrease because of subsequent oxidation.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Zhaolei Zheng, Chuntao Liu, Xuefeng Tian, Xiaoyu Zhang,