This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Spray Characteristics and Inside Flow of a Marine Diesel Injector
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 01, 2015 by SAE International in United States
Annotation ability available
The spray characteristics and inside flow of a marine diesel injector were investigated both experimentally and numerically. From the experiments, we observed that the penetration of the sprays in the early injection stage gradually increases. This phenomenon differs significantly from that of the small automobile diesel injector, in which penetration increases linearly with time. Using the momentum method to obtain injection rate measurements, we observed an injection rate spike at each injection event just after the injection began. The observed spray results show that the small portion of fuel remaining inside the nozzle from the previous injection event is ejected first, and then the main volume of fuel is ejected. Both fuels accumulate as spray droplets and gradually accelerate after the early injection stage. Numerical simulations of the injector's inside flow show that the fuel injection rate becomes saturated in needle lifts larger than 0.3 mm. Cavitation can be observed around the needle seat for smaller needle lifts. A larger cavitation area appears around the needle seat during the lifting movements than during the closing movements of the same needle lift. The difference in the injection amount from each of the five nozzle holes varies by approximately 8% because of the differences in the inside flow. As the deflection angle between the sac and nozzle hole greatly influences the flow around the entrance area and inside the nozzle holes, the discharge coefficient decreases in the nozzle holes with a larger deflection angle.
CitationYokobe, S., Oda, T., Ohsawa, K., Sumi, T. et al., "Spray Characteristics and Inside Flow of a Marine Diesel Injector," SAE Technical Paper 2015-01-1838, 2015, https://doi.org/10.4271/2015-01-1838.
- Goldsworthy Laurie and Tajima Hiroshi Modeling and Measurement of High Pressure Sprays, Ignition and Combustion of Heavy Fuel Oil and Marine Diesel Oil Journal of JIME 42 1 2007
- Tajima Hiroshi , Takasaki Koji , Takaishi Tatsuo and Murakami Shinsuke New Application of Direct Water Injection for Marine Diesel Engine CIMAC Paper No.29 2007
- Takasaki Koji , Tajima Hiroshi , Strom Alexander and Murakam Shinsuke Visualization of Combustion and CFD Study for NOx Reduction with Water Injection Proceedings of the 7th International Symposium on Marine Engineering Tokyo October 2005
- Schulz Reiner , Hensel Sebastian , von Rotz Beat , Schmid Andreas , Herrmann Kai Development of Spray and Combustion Simulation Tools and Application to Large Two-Stroke Diesel Engine Combustion Systems CIMAC congress 2013 2013
- Andriotis , A. , Gavaises , M. and Arcoumanis , C. , Vortex Flow and Cavitation in Diesel Injection Nozzles Journal of Fluid Mechanics 610 2008 195 215
- Masuda , R. , Fuyuto , T. and Nagaoka , M. , Validation of Diesel Fuel Spray and Mixture Formation from Nozzle Internal Flow Calculation Society of Automotive Engineers paper 2005-01-2098 2005
- Yamane T. , Sumi T. , Ohsawa K. and Oda T. , Numerical Analysis of Needle Eccentricity Effects on Internal Flow of Enlarged VCO Diesel Injector Transactions of the JSME (in Japanese) 80 812 2013