This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Study on Surrounding Air Flow Induced by Diesel Sprays
Annotation ability available
Sector:
Language:
English
Abstract
A study of the mixing mechanism of fuel with surrounding air is necessary in order to clarify the combustion process. In this study, the flow field near non-evaporating diesel spray as well as spray surface were observed and analyzed using a Nd-YAG laser light sheet. A single shot fuel spray was injected into a high pressure vessel and photographed under double-pulse laser illumination. The images of dispersed particles in the vessel were processed and velocity vectors were obtained by the auto-correlation method.
Measured results showed temporal variation in the air movement around the spray. Just after the start of injection, air near the nozzle was pushed outward by the spray tip, after which the flow direction reversed. The air velocity ahead of spray tip was very low compared to fuel spray tip velocity. At a stable injection condition, air near the nozzle tip was pulled by the spray movement and flowed uniformly, and the spray-air boundary was smooth. Downstream from nozzle tip, the air flow generates turbulence along the spray, and spray surface becomes complicated by the interference between fuel and air. It seems that rather small amount of air was entrained near to the nozzle tip, and more air entertainment occurred in the irregular spray mid-section region and at the spray tip.
Recommended Content
Authors
Citation
Sasaki, S., Akagawa, H., and Tsujimura, K., "A Study on Surrounding Air Flow Induced by Diesel Sprays," SAE Technical Paper 980805, 1998, https://doi.org/10.4271/980805.Also In
References
- Azetsu, A. Dodo S. Oikawa C. “A Study of the Structure of Diesel Sprays (2-D Visualization of a Non-Evaporating-Spray)” International Symposium COMODIA 90 199 204 1990
- Reitz, R. D. Diwakar R. “Structure of High Pressure Fuel Sprays” SAE Paper 870598 1987
- Kuniyoshi, Tanabe, H. Sato T. Fujimoto H. “Investigation of the Characteristics of Diesel Fuel Sprays” SAE Paper 800968 1980
- Obokata, T. Hashimoto T. “LDA Analysis of Diesel Spray and Entrainment Air Flow” International Symposium COMODIA 90 231 236 1990
- Ha, Jong-Yul Iida N. Sato G. T. Hayashi A. Tanabe H. “Experimental Investigation of the Entrainment into Diesel Spray” SAE Paper 841078 1984
- Cossali, G.E. Brunello G. Coghe A. “LDV Characterization of Air Entrainment in Transient Diesel Sprays” SAE Paper 910178 1991
- Cossali, G.E. Gerla, A. Coghe A. Brunello G. “Effect of Gas Density and Temperature on Air Entrainment in a Transient Diesel Spray” SAE Paper 960862 1996
- Shundoh, S. Kakegawa T. Tsujimura K. Kobayashi S. “The Effect of Injection Parameters and Swirl on Diesel Combustion with High-Pressure Fuel Injection” SAE Paper 910489 1991
- Shundoh, S. Komori M. Tsujimura K. Kobayashi S. “NOx Reduction from Diesel Combustion Using Pilot Injection with High Pressure Fuel Injection” SAE Paper 920461 1992
- Takeda, Y. Nakagome K. Niimura K. “Emission Characteristics of Premixed Lean Diesel Combustion with Extremely Early Staged Fuel Injection” SAE Paper 961163 1996
- Nishida, M Nakahira T. Komori M. Tsujimura K. Yamaguchi I. “Observation of a High-Pressure Fuel Spray with Laser Light Sheet Method” SAE Paper 920459 1992
- Ishikawa, N. Niimura K. “Analysis of Diesel Spray Structure Using Magnified Photography and PIV” SAE Paper 960770 1996
- Minami, T. Yamaguchi I. Shintani M. Tsujimura K. Suzuki T. “Analysis of Fuel Spray Characteristics and Combustion Phenomena under High-Pressure Fuel Injection” SAE Paper 900438 1990