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In-Cylinder Soot-Control with High-Speed Rotating Injector for DI Diesel Engines
Technical Paper
1999-01-3489
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In order to gain better control over the combustion process, a new type of injection concept was introduced in a previous paper by the author and co-workers [1]. Rotating the injector in a DI diesel engine is a powerful way for the engine developer to influence the fuel-distribution within the combustion chamber.
The rotating injector has in this work been implemented onto a modern 4-valve engine. The injector has speed capability up to 10,000 rpm in both directions by the use of an electric motor drive. The power requirement is modest. Typically up to 50 W.
The tests reveal that the rotating injector strongly affects the combustion and formation of emissions. For each loadpoint an optimum injector speed exists, where maximum reduction of smoke and CO can be obtained. Among the tested loadpoints, smoke could be reduced by up to 74 % by rotating the injector counter-swirl at 3350 rpm. This was attributed to reduced flow stagnation onto the piston bowl wall and more efficient air-fuel mixing which also reduced the ignition delay and intensified the combustion. The impact on NO was smaller (+16%) and showed an opposite behavior to soot.
A relationship with the effective swirl ratio at TDC is anticipated for co-swirl rotation.
An optical study of spray development shows that when the injector speed is so high that the sprays start interacting, a toroidial fuel cloud is formed.
Topic
Citation
Sjöberg, M., "In-Cylinder Soot-Control with High-Speed Rotating Injector for DI Diesel Engines," SAE Technical Paper 1999-01-3489, 1999, https://doi.org/10.4271/1999-01-3489.Also In
References
- Sjöberg Magnus Ångström Hans-Erik Kon-stanzer Dennis Thorin Oskar “The Rotating Injector, a New System for Diesel Combustion” SAE paper 982678 1998 SAE Transactions 1998
- Flynn Patrick F. Durett Russel P. Hunter Gary L. zur Loye Axel O. Akinyemi O.C. Dec John E. Westbrook Charles K. “Diesel Combustion: An Integrated View Combining Laser Diagnostics, Chemical Kinetics, and Empirical Validation” SAE paper 1999-01-0509
- Dickey D.W. Ryan, T.W. Matheaus A.C. “NOx Control in Heavy-Duty Diesel Engines - What is the Limit?” SAE paper 980174 1998
- Dec J.E. “A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging” SAE paper 970873 1997
- Naber J.D. Siebers D.L. “Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays” SAE paper 960034 1996
- Siebers D.L. “Liquid-Phase Fuel Penetration in Diesel Sprays” SAE paper 980809 1998
- Siebers D.L. “Scaling Liquid-Phase Fuel Penetration in Diesel Sprays Based on Mixing-Limited Vaporization” SAE paper 1999-01-0528
- Dec, J.E. Canaan R.E. “PLIF Imaging of NO Formation in a DI Diesel Engine” SAE paper 980147 1998
- Kurtz E.M. Foster D.E. “Exploring the Limits of Improving DI Diesel Emissions by Increasing In-Cylinder Mixing” SAE paper 982677 1998
- Masuda T. Itoh H. Ichihara Y. “Research on the Practical Application of 1 Liter, Semi-DI, 2-Stroke Diesel Engine to Compact Cars” SAE paper 1999-01-1249
- Sjöberg Magnus Ångström Hans-Erik Bergman Mikael Karlsson Hans “Spray-study Equipment: Hot-Gas Supply and Unit Injector Actuator for Bomb Studies” SAE paper 1999-01-0198
- Fuchs T.R. Rutland C.J. “Intake Flow Effects on Combustion and Emissions in a Diesel Engine” SAE paper 980508 1998
- Konstanzer D. “The Revolving Injector; a Numerical Concept Study of a Novel Fuel Injection System for DI Diesel Engines” CFD User Meeting 19-21 April 1999 Graz, Austria