This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Fuel Atomization by Flashing of a Volatile Liquid in a Liquid Jet
Annotation ability available
Sector:
Language:
English
Abstract
Flash boiling occurs when a liquid which initially is in a subcooled state, rapidly depressurized to a pressure sufficiently below saturation pressure to initiate a rapid boiling process. This phenomenon can be applied to improve fuel atomization in spark-ignition engines. In the present work, the characteristics of the generated spray were investigated experimentally. This is in order to establishing a designer guideline, for this high potential type of fuel injectors.
The following conclusions have been derived: 1. A typical droplets Sauter mean diameter in the range of 20-40μm can easily be achieved with the present simple fuel injection system. 2. The SMD decreases with the increasing in the mole fraction of the propellant; at high pressure however (high propellant content), the SMD is less and less affected. 3. The SMD and the droplets' uniformity are independent of the orifices' size. 4. The SMD increases with the axial distance. 5. Large size droplets may be generated at the periphery of the spray cone due to imperfections at the discharge orifice. 6. A simple and useful analytical expression which is based on energy balance principles demonstrates a good and practical correlation between the spray SMD and the operation conditions, as follows:
where, yβ,i is the mass fraction of the propellant, η, process efficiency, σ, surface tension, ρ, density, R, gas constant, T temperature and P pressure.
Recommended Content
Authors
Citation
Zeigerson-Katz, M. and Sher, E., "Fuel Atomization by Flashing of a Volatile Liquid in a Liquid Jet," SAE Technical Paper 960111, 1996, https://doi.org/10.4271/960111.Also In
Analyzing Fuel Systems Technology for Fuel Economy and Emissions
Number: SP-1151; Published: 1996-02-01
Number: SP-1151; Published: 1996-02-01
References
- Brown, R. York, J.L. “Sprays Formed by Flashing Liquid Jets” AIChE J. 8 49 153 1962
- Domnick, J. Lindenthal, A. Tropea, C. Xu, T.H. “Application of Phase Doppler Anemometry in Paint Sprays” Atomization and Sprays 4 437 450 1994
- El Shanawani, M.S.M. Lefebvre, A.H. “The Influence of Atomizer Scale on Airblast Atomization” J. of Energy 1980
- Fulton, R.A Yeomans, A. Rogers, E. Proc. 36th Mid-Year Meeting June 1950
- Kim Y.K. Iwai, N. Suto, H. Tsuraga, T. “Improvement of Alcohol Engine Performance by Flash Boiling Injection” JSAE Review 2 81 86 1980
- Lienhard, J.H. Stephenson, J.M. “Temperature and Scale Effects Upon Cavitation and Flashing in Free and Submerged Jets” J. Basic Engr. 84 525 532 1966
- Marek, C.J. Cooper, L.P. “Supercritical Fuel Injection System” 1980
- Oza, R.D. “On the Mechanism of Flashing Injection of Initially Subcooled Fuels” J. of Fluids Engineering 106 105 109 1984
- Oza, R.D. Sinnamon, J.F. “An Experimental and Analytical Study of Flash-Boiling Fuel Injection” SAE paper No. 830590 1983
- Park, B.S. Lee, S.Y. “An Experimental Investigation of the Flash Atornization Mechanism” Atornization and Sprays 4 2 159 179 1994
- Reitz, R.D. “A Photographic Study of Flash-Boiling Atomization” Aerosol Sci. and Tech. 12 561 569 1990
- Sher, E. Elata, C. “Spray Formation From Pressure Cans by Flashing” Ind. Eng. Chem. Process Des. Dev. 16 2 237 242 1977
- Sher, E. Zeigerson-Katz, M. “Spray Formation From Flashing of a Binary Mixture - an Energy Balance Approach” Atornization and Sprays 1995
- Solomon, A.S.P. Rupprecht, S.D. Chen, L.D. Faeth, G.M. “Flow and Atomization in Flashing Injectors” Atornization and Spray Technology 1 53 76 1985
- Suzuki, M. Yamamoto, T. Fatagami, N. Maeda, S. “Atornization of A Superheated Liquid Jet” Proc. 1st Int' Conference on Liq. Atornization and Spray Systems Tokyo 1978
- Wildgen, A. Straub, J. “The Boiling Mechanism in Superheated Free Jets” Int. J. Multiphase Flow 15 2 193 207 1989