This content is not included in your SAE MOBILUS subscription, or you are not logged in.
3D CFD Analyses of Intake Duct Geometry Impact on Tumble Motion and Turbulence Production in SI Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 08, 2017 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
In recent years, engine manufacturers have been continuously involved in the research of proper technical solutions to meet more and more stringent CO2 emission targets, defined by international regulations. Many strategies have been already developed, or are currently under study, to attain the above objective. A tendency is however emerging towards more innovative combustion concepts, able to efficiently burn lean or highly diluted mixtures. To this aim, the enhancement of turbulence intensity inside the combustion chamber has a significant importance, contributing to improve the burning rate, to increase the thermal efficiency, and to reduce the cyclic variability. It is well-known that turbulence production is mainly achieved during the intake stroke. Moreover, it is strictly affected by the intake port geometry and orientation.
In this paper, different geometries of the intake port are analyzed by means of a 3D-CFD approach, to foresee the flow evolution and tumble motion development during intake and compression strokes. Tumble vortex collapse and turbulence production at the end of the compression stroke are analyzed in detail, since turbulence levels just before TDC have a direct impact on the combustion process. Analyses are carried out under motored operation, with time-varying boundary conditions provided by a 1D model of the whole engine. The mass-averaged intensities of tumble motion and turbulence are evaluated for different intake port orientations and throat areas. An analytical correlation between intake duct orientation and turbulence intensity is identified. The latter represents a useful tool to easily recognize the optimal geometrical configuration of the intake port promoting the required in-cylinder turbulence level. The numerical results will constitute the basis for the development of a phenomenological turbulence model, able to sense the main geometric parameters of the intake system.
CitationCameretti, M., De Bellis, V., Romagnuolo, L., Iorio, A. et al., "3D CFD Analyses of Intake Duct Geometry Impact on Tumble Motion and Turbulence Production in SI Engines," SAE Technical Paper 2017-01-2199, 2017, https://doi.org/10.4271/2017-01-2199.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
|[Unnamed Dataset 2]|
- Aleiferis, P., G., Behringer, M., K., Malcolm, J., S., “Integral Length Scales and Time Scales of Turbulence in an Optical Spark-Ignition Engine”, Flow Turbulence Combust 98:523-577, 2017 doi: 10.1007/s10494-016-9775-9.
- Wang, T., Liu, D., Tan, B., Wang, G., Peng, Z., “An investigation into in-cylinder tumble flow characteristics with variable valve lift in a gasoline engine”, Flow Turbul. Combust 94, 285-304, 2014, doi: 10.1007/s10494-014-9562-4.
- Achuth, M., Mehta, P.S. “Predictions of tumble and turbulence in four-valve pentroof spark ignition engines”, International Journal of Engine Research 2(3): 209-227, 2001, doi: 10.1243/1468087011545442. 21.
- Bianchi, G. and Fontanesi, S., "On the Applications of Low-Reynolds Cubic k-ϵTurbulence Models in 3D Simulations of ICE Intake Flows," SAE Technical Paper 2003-01-0003, 2003, doi:10.4271/2003-01-0003.
- Buhl, S., Gleiss, F., Kohler, M. Hartmann, F., Messig, D., Brucker, ·C., Hasse1, C., “A Combined Numerical and Experimental Study of the 3D Tumble Structure and Piston Boundary Layer Development During the Intake Stroke of a Gasoline Engine”, Flow Turbulence Combust 98:579-600, 2017, doi: 10.1007/s10494-016-9754-1.
- Hartmann, F., Buhl, S., Gleiß, F., Barth, P., Schild, M., Kaiser, S., Hasse, C., “Spatially resolved experimental and numerical investigation of the flow through the intake port of an IC engine”, Oil Gas Sci. Technol. Rev. IFP Ener. Nouvelles 71, 2, 2016, doi: https://doi.org/10.2516/ogst/2015022.
- Jainski, C., Lu, L., Dreizler, A., Sick, V. “High-speed micro particle image velocimetry studies of boundary-layer flows in a direct-injection engine”, International Journal of Engineering Research, 14(3): 247-259, 2013, doi: 10.1177/1468087412455746.
- Wilcox, D., “Turbulence modeling for CFD, Second Edition”, (DCW Industries Inc., 1994), ISBN: 0-9636051
- Janas, P., Wlokas, I., Bohm, B., Kempf, A., “On the Evolution of the Flow Field in a Spark Ignition Engine”, Flow Turbulence Combust 98:237-264, 2017, doi: 10.1007/s10494-016-9744-3.
- Pitcher, G., Wigley, G., “A Comparison between In-cylinder Steady Flow and Motored Engine Air Velocities Using LDA", presented at 16th Int. Symp. on Applications of Laser Techniques to Fluid Mechanics Lisbon, Portugal, 09-12 July, 2012.
- De Bellis, V., Severi, E., Fontanesi, S., Bozza, F., “Hierarchical 1D/3D approach for the development of a turbulent combustion model applied to a VVA turbocharged engine. Part I: turbulence model”, Energy Procedia 45: 829 - 838, 2014, doi: https://doi.org/10.1016/j.egypro.2014.01.088.
- Ramajo, D., Zanotti, A., Nigro, N., “Assessment of a zero-dimensional model of tumble in four-valve high performance engine”, International Journal of Numerical Methods for Heat & Fluid Flow, 17 (8):770-787, 2007, doi: 10.1108/09615530710825765.
- Murase, E., Shimizu, R., “Innovative Gasoline Combustion Concepts for Toyota New Global Architecture” presented at 25th Aachen Colloquium Automobile and Engine Technology, Germany, October 10-12, 2016.
- Brusiani, f., Falfari, S., Cazzoli, G., “Tumble Motion Generation in Small Gasoline Engines: A New Methodological Approach for the Analysis of the Influence of the Intake Duct Geometrical Parameters”, Energy Procedia 45: 997 - 1006, 2014, doi: https://doi.org/10.1016/j.egypro.2014.01.105.
- De Bellis, V., Bozza, F., Fontanesi, S., Severi, E. et al., "Development of a Phenomenological Turbulence Model through a Hierarchical 1D/3D Approach Applied to a VVA Turbocharged Engine," SAE Int. J. Engines 9(1):506-519, 2016, doi:10.4271/2016-01-0545.
- Heywood, J., B., “Internal Combustion Engine Fundamentals”, (McGraw-Hill, 1988), ISBN: 007028637.
- STAR-CD © 4.26 User Guide.