Influence on Injection and Combustion Phenomena by Elimination of Hole Nozzle Sac Volume
860416
02/01/1986
- Event
- Content
- For the reduction of unburned hydrocarbon emission from DI diesel engines nozzle sac volume is reduced and, in some cases, eliminated by covering the orifice with a valve.Studies on the sacless nozzle, however, clarified that it seriously influences the injection phenomena :
- i. The state of the fuel spray is different at each spray hole and at each needle lift.
- ii. Facilitates the combustion gas blow-back into the nozzle.
The following are elucidated through this study :- i. Irregular state of spray bases on flow line at the space between seat and needle different for each orifice and for each needle lift.
- ii. Gas blow-back occurs when needle bouncing and cylinder gas oscillation take place at the same time.
- i.
- Pages
- 16
- Citation
- Andoh, H., and Shiraishi, K., "Influence on Injection and Combustion Phenomena by Elimination of Hole Nozzle Sac Volume," SAE Technical Paper 860416, 1986, https://doi.org/10.4271/860416.