Abstract
The effect of spray-flat-wall interaction on the diesel combustion characteristics in a constant-volume vessel was investigated. A flat wall was fixed perpendicular to the nozzle hole axis. Three injection pressures of 100 MPa, 150 MPa and 200 MPa and a single nozzle hole with a diameter of 0.133 mm were employed. Mie scattering was adopted to detect the spray formation process; OH∗ chemiluminescence and natural colour luminosity were conducted to analyse the combustion process. The two-colour method was applied to calculate the soot emissions and the temperature distribution. The results reveal that, in comparison with a free spray flame, flat-wall impingement causes diesel combustion to deteriorate when the liquid phase-wall interaction occurs; however, when an appropriate impinging distance (longer than liquid-phase penetration) is selected, combustion is observed to be enhanced. As for the impinging spray flame, when the injection pressure is increased, soot formation decreases; however, combustion is not linearly enhanced by increasing the injection pressure, and the OH∗ chemiluminescence intensity achieves the highest value with an injection pressure of 150 MPa.
| Original language | English |
|---|---|
| Pages (from-to) | 535-549 |
| Number of pages | 15 |
| Journal | Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering |
| Volume | 229 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 19 Apr 2015 |
| Externally published | Yes |
Keywords
- Diesel combustion
- OH
- chemiluminescence
- impingement
- impinging distance
- injection pressure
- two-colour pyrometry