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Intake and In-Cylinder Flow Modeling Characterization of Mixing and Comparison with Flow Bench Results
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Abstract
A modified version of the three dimensional CFD code KIVA-3, which accommodates moving valves and a moving piston crown, has been applied to a heavy-duty, four cycle, dual intake valve, direct injection, diesel engine The fluid domain encompasses an intake runner, two valved ports and a cylinder with a Mexican hat bowl-in-piston configuration
In the first part of the study, the modified KIVA-3 code was used to simulate the flow through the port and cylinder of the engine without a piston The intake valves were cycled (300 rpm at the camshaft) Two turbulence models were compared in this part of the study, standard k - ε and the RNG modified k - ε as discussed in [11] The results were compared to particle image velocimetry (PIV) images Large scale flow features of the computer simulations agreed moderately well with the ensemble averaged flow bench results There was very little difference between the results from the two turbulence models
Motored engine simulations including a piston were conducted to characterize the in-cylinder gas flow and mixing during the intake and compression strokes Characterization methods were developed which yield insight into the in-cylinder gas motion and mixing during both strokes Intake and residual gases are tracked separately, both large scale convection and turbulent mixing are investigated, flow critical points are examined to provide information about flow topology and turbulence production is correlated with the evolution of flow structures
Results show that mixing of the intake and residual gases is very non-uniform Many complex flow structures develop during intake and are destroyed during compression However, several structures survive through compression and contribute to enhanced mixing near top dead center These significant structures have been identified and tracked back to intake The flow field near top dead center exhibits spatial inhomogeneities in temperature and small scale mixing parameters such as turbulence kinetic energy and its dissipation rate
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McLandress, A., Emerson, R., McDowell, P., and Rutland, C., "Intake and In-Cylinder Flow Modeling Characterization of Mixing and Comparison with Flow Bench Results," SAE Technical Paper 960635, 1996, https://doi.org/10.4271/960635.Also In
References
- Amsden, A A “KIVA-3 A KIVA Program with Block-Structured Mesh for Complex Geometries,” Los Alamos National Laboratory 1993
- Arcoumanis, C Whitelaw, J H “Fluid Mechanics of Internal Combustion Engines A Review,” Fluids Engineering Division (Publication) FED ASME New York, New York 1 17 1982
- Arcoumanis, C Begleris, P Gosman, A D Whitelaw, J H “Measurements and Calculations of the Flow in a Research Diesel Engine,” SAE 861563 1986
- Godrie, P Zellat, M “Simulation of Flow Field Generated by Intake Port-Valve-Cylinder Configurations - Comparison with Measurements and Applications,” SAE 940521 1994
- Gosman, A D “Multidimensional Modeling of Cold Flows and Turbulence in Reciprocating Engines,” SAE 850344 1985
- Hessel, R P “Numerical Simulation of Valved Intake Port and In-Cylinder Flows Using KIVA3,” Department of Mechanical Engineering, University of Wisconsin - Madison 1993
- Hessel, R P Rutland, C J “Intake Flow Modeling in a Four Stroke Diesel Using KIVA3,” AIAA paper 93-2952 1993
- Heywood, J B “Fluid Motion Within the Cylinder of Internal Combustion Engines - The 1986 Freeman Scholar Lecture,” Journal of Fluids Engineering 109 March 1987
- Khalighi, B “Intake-Generated Swirl and Tumble Motions in a 4-Valve Engine with various Intake Configurations - Flow Visualization and Particle Tracking Velocimetry,” SAE 900059 1990
- Khalighi, B El Tahry, S H Haworth, D C Huebler, M S “Computation and Measurement of Row and Combustion in a Four-Valve Engine with Intake Variations,” SAE 950287 1995
- Han, Z Reitz R.D “Turbulence Modeling of Internal Combustion Engines Using RNG k - ε Models,” Combustion Science and Technology 106 267 295 1995
- Kuo, T-W “Multidimensional Port-and-Cylinder Gas Flow, Fuel Spray, and Combustion Calculations for a Port-Fuel-Injection Engine,” SAE 920515 1992
- Mather, D K “Modeling The Use of an Air-Injection for Emissions Reduction in a Direct-Injected Diesel Engine,” Department of Mechanical Engineering, University of Wisconsin - Madison 1995
- McDowell, P D “Documenting Intake Flow with Particle Image Velocimetry,” University of Wisconsin - Madison 1994
- Monaghan, M L Pettifer, H F “Air Motion and Its Effect on Diesel Performance and Emissions,” SAE 810255 1981
- Paul, E M “Numerical Prediction of Fluid Motion in the Induction System and the Cylinder in Reciprocating Engines,” SAE 870594 1987
- Shimoda, M Shigemori, M Tsuruoka, S “Effect of Combustion Chamber Configuration on In-Cylinder Air Motion and Combustion Characteristics of D I Diesel Engine,” SAE 850070 1985
- Stephenson, P W Rutland, C J “Modeling the Effects of Intake Flow Characteristics on Diesel Engine Combustion,” SAE 950282 1995
- Stephenson, P W Rutland, C J “Modeling the Effects of Valve Lift Profile on Intake Flow and Emissions Behavior in a DI Diesel Engine,” SAE 952430 1995
- Taghavi, R Dupont, A “Investigation of the Effect of Inlet Port on the Flow in a Combustion Chamber Using Multidimensional Modeling,” Journal of Engineering for Gas Turbines and Power 111 July 479 484 1989
- Tennekes, H Lumley, JL A First Course in Turbulence The MIT Press Cambridge, Massachusetts 1972
- Trigui, N Kent, J C Guezennec, Y Choi, W -C “Characterization of Intake Generated Fluid Flow Fields in IC engines Using 3-D Particle Tracking Velocimetry (3-D PTV),” SAE 940279 1994
- Walatka, P P Clucas, J McCabe, R K Plessel, T Potter, R “FAST User Guide,” NASA Ames Research Center NAS Division, RND Branch 1994
- Watkins, A P Dessipris, S Khaleghi, H “The Combined Effects on Fluid Flow During Compression of Piston Bowl Shape and Offset, and Swirl Ratio,” SAE 870595 1987
- Haworth, D C Huebler, M S El Tahry, S H Matthes, W R “Multidimensional Calculations for a Two-Stroke-Cycle Engine A Detailed Scavenging Model Validation,” SAE 932712 1993
- Danckwerts, P V “The Definition and Measurement of Some Characteristics of Mixtures,” Applied Scientific Research A III 279 296 1952