| Autor: |
Masahide TAKAGI, Satoshi KAWAUCHI |
| Jazyk: |
japonština |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Nihon Kikai Gakkai ronbunshu, Vol 85, Iss 876, Pp 18-00329-18-00329 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2187-9761 |
| DOI: |
10.1299/transjsme.18-00329 |
| Popis: |
An effective combustion technique is required in order to utilize low ignitability fuels. As one of the solution techniques, pilot injection strategies in diesel engines are widely employed to improve the ignition and exhaust emission characteristics. The aim of this study is to investigate the effect of pilot fuel injection. Fuels used in this study have different cetane indices, which were varied by the relative volumetric percentages of LCO (Light Cycle Oil) and diesel fuel. In addition, the distance between the injector tip and the wall was varied in order to investigate the wall effect on the pilot spray behavior and the subsequent ignition and combustion processes. The results showed that the ignition delay time of the low ignitability fuel was effectively reduced by the pilot fuel at low injection pressure. Visualization results revealed that the spray momentum of the pilot fuel is lost at vicinity of the injector tip. In the case of pilot injection at high injection pressure, the wall effect plays an important role for promoting the interaction between pilot and main spray. This is because the fuel/air mixture of the pilot spray drifts in the vicinity of the wall due to the spray impingement and it can prevent the dispersion of pilot spray before the interference with the main spray. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
