This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Influence of Injector Deposits on Mixture Formation in a DISC SI Engine
Technical Paper
2003-01-1771
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
This paper presents a follow on study from earlier work investigating the influence of fuel parameters on the deposit formation and emissions from a direct injection stratified charge spark ignition engine. It was shown that injector fouling was the main reason for the increase in unburned hydrocarbon emissions and spray visualizations supported these results. The hypothesis is that the deposit buildup in the injector caused the increased hydrocarbon emissions due to an increased wall film formation.
To further verify the findings, Phase Doppler Anemometry measurements at simulated engine conditions, were performed. Measurements recorded on the injector axis 20 mm downstream from the injector orifice, showed that the initial pre-jet velocity was 30% higher and the drop mean diameter was 5% larger in the case of a used injector compared to a new injector.
Based on these investigations, spray files were set-up in the 3-D CFD-code AVL FIRE™. A moving calculation mesh, capturing the main geometrical features from the Mitsubishi GDI® combustion system, was created. With this calculation mesh, the influence of important parameters on the mixture formation was studied for the two injectors.
Simulations showed that the mass of fuel captured in the wall film with a new injector was equivalent to 10% of the total injected fuel mass. With a fouled injector this rose to around 30%. This supports the hypothesis that the injector fouling makes a significant contribution to the increased amounts of hydrocarbon emissions found in engine tests.
Recommended Content
Authors
Citation
Lindgren, R., Skogsberg, M., Sandquist, H., and Denbratt, I., "The Influence of Injector Deposits on Mixture Formation in a DISC SI Engine," SAE Technical Paper 2003-01-1771, 2003, https://doi.org/10.4271/2003-01-1771.Also In
References
- Cheng, S.S. Kim C. Effect of Engine Operating Parameter on Engine Combustion Chamber Deposits SAE Technical Paper Series, No. 902108 1990
- Fraidl, G.K. Piock W.F. Wirth M. Gasoline Direct Injection: Actual Trends and Future Strategies for Injection and Combustion Systems SAE Technical Paper Series, No. 960465 1996
- Harada, J. Tomita T. Mizuno H. Mashiki Z. Ito Y. Development of Direct Injection Gasoline Engine SAE Technical Paper Series, No. 970540 1997
- Kalghatgi, G.T. Combustion Chamber Deposits in Spark-Ignition Engines. A Literature Review SAE Technical Paper Series, No. 952443 1995
- Kanda, M. Baika T. Kato S. Iwamuro M. Koike M. Saito A. Application of a New Combustion Concept to a Direct Injection Gasoline Engine SAE Technical Paper Series, No. 2000-01-0531 2000
- Kano, M. Saito K. Basaki M. Matsushita S. Gohno T. Analysis of Mixture Formation of Direct Injection Gasoline Engine SAE Technical Paper Series, No. 980157 1998
- Koike, M. Saito A. Tomoda T. Yamamoto Y. Research and Development of a New Direct Injection Gasoline Engine SAE Technical Paper Series, No. 2000-01-0530 2000
- Kume, T. Iwamoto Y. Iida K. Murakami M. Akishino K. Ando H. Combustion Control Technologies for Direct Injection SI Engine SAE Technical Paper Series, No. 960600 1996
- Sandquist, H. Denbratt I. Owrang F. Olsson J. Influence of Fuel Parameters on Deposit Formation and Emissions in a Direct Injection Stratified Charge SI Engine SAE Special Publications, Vol. 1629, No. 2001-01-2028 207 218 2001
- Sandquist, H. Lindgren R. Denbratt I. Sources of Hydrocarbon Emissions from a Direct Injection Stratified Charge Spark Ignition Engine SAE Special Publications, Vol. 1547, No. 2000-01-1906 101 111 2000
- Takeda, K. Sugimoto T. Tsuchiya T. Ogawa M. Ueda S. Yoneshige K. Slit Nozzle Injector for a New Concept of Direct Injection SI Gasoline Engine SAE Technical Paper Series, No. 2000-01-1902 2000
- Tomoda, T. Sasaki S. Sawada D. Saito A. Sami H. Development of Direct Injection Gasoline Engine - Study of Stratified Mixture Formation SAE Technical Paper Series, No. 970539 1997
- Zhao, F. Lai M.-C. Harrington D.L. Automotive spark-ignited direct-injection gasoline engines Progress in Energy and Combustion Science 25 437 562 1999
- Zhao, F. Lai M.-C. Harrington D.L. A Review of Mixture Preparation and Combustion Control Strategies for Spark-Ignited Direct-Injected Gasoline Engines SAE Technical Paper Series, No. 970627 1997