This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Study on Air Assist Fuel Injector Atomization and Effects on Exhaust Emission Reduction
Annotation ability available
Sector:
Language:
English
Abstract
The effect of fuel injection atomization on engine performance has been known to improve fuel economy and to reduce emissions. Hitachi America, Ltd. Research and Development along with Hitachi Research Laboratory in Japan have studied the effects and the operation of the air assist injection system which was developed and studied to help meet future Low Emission Vehicles (LEV) regulations and also Ultra Low Emission Vehicles (ULEV) regulations.
The system consisted of newly designed air assist injectors having a spray angle of 15° at 170 kPa (absolute air pressure) with 370 kPa (absolute fuel pressure). The air assist injector generates highly atomized fuel droplets by swirling the fuel clockwise and the air counterclockwise. The fuel and air flowing in opposite directions collide, thereby producing particles around 30 μm in size at 274 kPa air pressure.
These characteristics improve cold start, cold coolant conditions and fully warm engine conditions. HydroCarbons (HC) reduction of up to 40 percent were obtained with certain set engine parameters.
Recommended Content
| Technical Paper | A Premium Heavy Duty Engine Concept for 2005 and Beyond |
| Technical Paper | A Before and After Study of the Change to Unleaded Gasoline-Test Results from EPA and Other Cycles |
Topic
Citation
Saikalis, G., Byers, R., and Nogi, T., "Study on Air Assist Fuel Injector Atomization and Effects on Exhaust Emission Reduction," SAE Technical Paper 930323, 1993, https://doi.org/10.4271/930323.Also In
References
- Kashiwaya M. Kosuge T. Nakagawa K. Okamoto Y. “The Effect of Atomization of Fuel Injectors on Engine Performance,” SAE paper 900261
- Nogi T. Ohyama Y. Yamauchi T. “Effects of Mixture Formation of Fuel Injection System in Gasoline Engine,” SAE paper 891961
- Harada K. Shimizu R. Kurita K. Muramatsu M. Makimura T. Ohashi M. “Development of Air-Assisted Injector System,” SAE paper 920294
- Emerson J. Felton P.G. Bracco F.V. “Structure of Sprays from Fuel Injectors - Part III: The Ford Air Assisted Injector System,” SAE paper 900478
- Chigier N. Lefebvre A. “Atomization and Sprays,” Carnegie Mellon 1991
- Bachalo W. D. Houser M. J. “Development of the Phase/Doppler Spray Analyzer For Liquid Drop Size And Velocity Characterizations,”
- Sankar S.V. Weber B.J. Kamemoto D.Y. Bachalo W.D. “Sizing Fine Particles With The Phase Doppler lnterferometric Technique,” Proceedings of 2nd lnternational Congress On Optical Particle Sizing