This content is not included in your SAE MOBILUS subscription, or you are not logged in.
A Study on Diesel Spray Characteristics for Small- Quantity Injection
Technical Paper
2018-01-0283
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
Multi-stage injection with pilot injection and post injection has been widely used for the noise and emissions reduction of diesel engines. Considering many parameters to be decided for optimal combustion, computer simulations such as three dimensional computational fluid dynamics (3D-CFD) and lower dimensional codes should play a role for optimal selection of intervals and quantity ratios. However, the data for the sprays are insufficient for reproducing the actual fuel-air mixture formation process related to pilot and post injection. Hence, there is a need for experimental data with a small-quantity injection. The small-quantity injection is characterized with an injection rate shape similar to a triangle rather than a rectangle. This study is mainly focused on the spray characteristics of diesel sprays in which the entire process is dominated by unsteady injection processes. The effects of injection parameters and nozzle hole diameter on spray penetration, spray angle, and fuel concentration are studied with the help of a rapid compression and expansion machine. A hybrid of shadowgraph and Mie scattering imaging set-up is used to visualize both spray liquid phase and vapor phase at the same time. A high-speed camera with a frame rate of 90,000 fps is used to acquire spray images. Two injectors with a nozzle hole diameter of 0.12 mm and 0.14 mm are used. The studies are performed at the injection pressure of 40, 80, and 120 MPa while environmental temperature of 850 K. The experimental results show that the development of the spray tip is proportional to t and then to t1/2 at the later stage, and after the end of the injection, the spray tip penetration is found to follow t1/4. Also, the spray liquid penetration, spray dispersion, and air-fuel mixing processes are evaluated and compared with various injection parameters. In addition, the instantaneous behavior of the near-nozzle spray angle is studied carefully in order to provide reliable input data for spray models.
Recommended Content
Authors
Topic
Citation
Bao, Z., Horibe, N., and Ishiyama, T., "A Study on Diesel Spray Characteristics for Small- Quantity Injection," SAE Technical Paper 2018-01-0283, 2018, https://doi.org/10.4271/2018-01-0283.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| [Unnamed Dataset 1] |
Also In
References
- Zhang, L. , “A Study of Pilot Injection in a DI Diesel Engine,” SAE Technical Paper 1999-01-3493 , 1999, doi:10.4271/1999-01-3493.
- Ogawa, H., Yoshida, T., Takahashi, K., and Numata, A. , “Improvements in Diesel Combustion with After-Injection,” Transactions of Society of Automotive Engineers of Japan 39(1):101-106, 2008.
- Badami, M., Millo, F., and D'amato, D.D. , “Experimental Investigation on Soot and NOx Formation in a DI Common Rail Diesel Engine with Pilot Injection,” SAE Technical Paper 2001-01-0657 , 2001, doi:10.4271/2001-01-0657.
- Hiroyasu, H. and Arai, M. , “Structures of Fuel Sprays in Diesel Engines,” SAE Technical Paper 900475 , 1990, doi:10.4271/900475.
- Naber, J. and Siebers, D. , “Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays,” SAE Technical Paper 960034 , 1996, doi:10.4271/960034.
- Kostas, J., Honnery, D., and Soria, J. , “Time Resolved Measurements of the Initial Stages of Fuel Spray Penetration,” Fuel 88(11):2225-2237, 2009, doi:10.1016/j.fuel.2009.05.013.
- Musculus, M. and Kattke, K. , “Entrainment Waves in Diesel Jets,” SAE Int. J. Eng. 2(1):1170-1193, 2009, doi:10.4271/2009-01-1355.
- Pickett, L., Manin, J., Payri, R., Bardi, M. et al. , “Transient Rate of Injection Effects on Spray Development,” SAE Technical Paper 2013-24-0001 , 2013, doi:10.4271/2013-24-0001.
- W. Zeuch , “Neue Verfahren zur Messung des Einspritzgesetzes und der Einspritz-Regelmaessigkeit von Diesel-Einspritzpumpen”, MTZ Johrg. 22 helf 9.1961 [in German].
- Knox, B. and Genzale, C. , “Effects of End-Of-Injection Transients on Combustion Recession in Diesel Sprays,” SAE Int. J. Eng. 9(2):932-949, 2016, doi:10.4271/2016-01-0745.
- Johnson, J., Naber, J., Lee, S., Kurtz, E. et al. , “Investigation of Diesel Liquid Spray Penetration Fluctuations under Vaporizing Conditions,” SAE Technical Paper 2012-01-0455 , 2012, doi:10.4271/2012-01-0455.
- Payri, R., Salvador, F.J., Gimeno, J., and Zapata, L.D. , “Diesel Nozzle Geometry Influence on Spray Liquid-Phase Fuel Penetration in Evaporative Conditions,” Fuel 87(7):1165-1176, 2008, doi:10.1016/j.fuel.2007.05.058.
- Gavaises, M. and Andriotis, A. , “Cavitation Inside Multi-Hole Injectors for Large Diesel Engines and Its Effect on the Near-Nozzle Spray Structure,” SAE Technical Paper 2006-01-1114 , 2006, doi:10.4271/2006-01-1114.
- Taşkiran, Ö.O. and Ergeneman, M. , “Experimental Study on Diesel Spray Characteristics and Autoignition Process,” Journal of Combustion 2011:528126, 20 pages, 2011, doi:10.1155/2011/528126.
- Wakuri, Y., Fujii, M., Amitani, T., and Tsuneya, R. , “Studies on the Penetration of Fuel Spray of Diesel Engine,” Transactions of the Japan Society of Mechanical Engineers 25(156):820-826, 1959, doi:10.1299/kikai1938.25.820.