This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effect of Intake Port Design on the Flow Field Stability of a Gasoline DI Engine
Technical Paper
2011-01-1284
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The application of technologies such as direct injection, turbo charging and variable valve timing has caused a significant evolution of the gasoline engine with positive effects on fuel consumption and emissions. The current developments are primarily focused on the realization of improved full load characteristics and fuel consumption reduction with stoichiometric operation, following the downsizing approach in combination with turbo charging and high specific power. The requirements of high specific power in a relatively small cylinder displacement and a wide range of DI injection specifications lead to competing development targets and to a high number of degrees of freedom during engine layout and optimization. One of the major targets is to assess the stability of the combustion system in the early development phase.
The in-cylinder charge motion generation by different intake port concepts has been identified as a potential source of cyclic fluctuations due to dynamic instabilities. The identification of cyclic fluctuations of the in-cylinder charge motion has become possible by the application of high speed optical diagnostic methods, which enable a cyclic resolved analysis of the charge motion development.
In this paper the charge motion generation and evolution of cyclic fluctuations are investigated by high speed particle image velocimetry (HSPIV) for two different intake port designs with individual tumble levels. The optical diagnostics are performed on a flexible motored engine, which is capable to be operated with metal flow boxes instead of prototype cylinder heads. The results show that cycle resolved HSPIV enables to provide an improved understanding of the evolution of cyclic instabilities of the primary tumble charge motion as well as secondary charge motion, such as omega tumble structures and fluctuations due to large scale turbulence. The fluctuation intensity can be expected to have a significant impact to the mixture formation and at the end of the compression to the combustion stability.
This present study shows that in order to change the tumble intensity a switch between different intake port designs is a trade off between high tumble intensities leading to fast burning rates and strong cyclic fluctuations decreasing the combustion stability.
Recommended Content
Authors
Citation
Adomeit, P., Jakob, M., Pischinger, S., Brunn, A. et al., "Effect of Intake Port Design on the Flow Field Stability of a Gasoline DI Engine," SAE Technical Paper 2011-01-1284, 2011, https://doi.org/10.4271/2011-01-1284.Also In
References
- Wiese, W. Pischinger, S. Adomeit, P. Ewald, J. “Prediction of Combustion Delay and - Duration of Homogeneous Charge Gasoline Engines Based on In-Cylinder Flow Simulation,” SAE Technical Paper 2009-01-1796 2009 10.4271/2009-01-1796
- HEYWOOD, J.B. Internal Combustion Engines Fundamentals McGraw Hill 1988
- Baby, X. Dupont, A. Ahmed, A. Deslandes, W. et al. “A New Methodology to Analyze Cycle-to-Cycle Aerodynamic Variations,” SAE Technical Paper 2002-01-2837 2002 10.4271/2002-01-2837
- Adomeit, P. Lang, O. Pischinger, S. Aymanns, R. et al. “Analysis of Cyclic Fluctuations of Charge Motion and Mixture Formation in a DISI Engine in Stratified Operation,” SAE Technical Paper 2007-01-1412 2007 10.4271/2007-01-1412
- KRISHNA, B. M. MALLIKARJUNA, J.M. Tumble Flow Analysis in an Unfired Engine Using Particle Image Velocimetry World Academy of Science, Eng. & Technology 54 2009
- Adomeit, P. Weinowski, R. Ewald, J. Brunn, A. et al. “A New Approach for Optimization of Mixture Formation on Gasoline DI Engines,” SAE Paper 2010-01-0591 2010 10.4271/2010-01-0591
- MITTAL, M. SCHOCK, H.J. A Study of Cycle-to-Cycle Variations and the Influence of Charge Motion Control on In-Cylinder Flow in an IC Engine J. of Fluids Engineering 132 May 2010 051107-1 8
- MÜLLER, S.H.R. BÖHM, B. GLEIßNER, M. GRZESZIK, R. ARNDT, S. DREIZLER, A. Flow field measurements in an optically accessible direct-injection spray guided internal combustion engine using high-speed PIV Exp. In Fluids 2010 48 281 290
- TOWERS, D.P. TOWERS, C.E. Cyclic variability measurements of in-cylinder engine flows using high speed particle image velocimetry Meas. Sci. Technol. 2004 15 1917 1925
- HUANG, R.F. LIN, K.H. YEH, C.-N. LAN, J. In-cylinder tumble flows and performance of a motorcycle engine with circular amd elliptic intake ports Exp. In Fluids 2009 46 165 179
- RAFFEL, M. WILLERT, C. KOMPENHANS, J. Particle Image Velocimetry - A Practical Guide Springer Berlin-Heidelberg 1998