Abstract
The intake and spray process in a gasoline direct injection (GDI) engine was simulated using LES to investigate the characteristics of the turbulent fluctuations above sub-grid length scale and its effects on the mixture formation. A k-equation SGS model was implemented in the KIVA-Chemkin code. The flow field in the combustion chamber during intake and spray process was simulated and the effects of turbulence fluctuations on velocity fields, turbulent viscosity and turbulent kinetic energy distribution were analyzed. The simulation results predict the variation of tumble ratio, averaged turbulence kinetic energy, velocity fields and mixture distribution with crank angles. Compared with RANS method, the LES method predicts better transient result of the tumble motion and mixture formation during spray process.
| Original language | English |
|---|---|
| Pages (from-to) | 2174-2177 |
| Number of pages | 4 |
| Journal | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics |
| Volume | 34 |
| Issue number | 11 |
| State | Published - Nov 2013 |
| Externally published | Yes |
Keywords
- Flow
- Gasoline engine
- GDI
- LES
- Spray
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