This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Numerical Investigation of the Intake Flow of a Four-Valve Diesel Engine
Technical Paper
2017-01-2211
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
The intake process plays an important role in the operation of internal combustion engines. In the present study, a three-dimensional transient simulation of a four-valve diesel engine was performed using Large Eddy Simulation (LES) model based on software CONVERGE. The mean velocity components in three directions through the intake valve curtain, the flow separation around the intake valves, the influences of inlet jet on turbulence flow field and cycle-to-cycle variation were investigated in this work. The result shows that the mean velocity distributes non-uniformly near the valve curtain at high valve lifts. In contrast, the mean velocity distribution is uniform at low valve lifts. It is found that the flow separation occurs at valve stem, valve seat and valve sealing through the outlet of the helical port. In contrast, flow separation is only observed in the valve seat through the outlet of the tangential port. It is noted that the flow separation causes the backflow to occur near the valve, which affects the mass of fresh charge significantly. In order to research the influence of the inlet jet on turbulence flow fields, a parameter was proposed in this work, named Jet-Angle, which indicates the angle between the inlet jet centerline and the valve gap centerline. The results show that the orientation of the inlet jet changes regularly with crank angle and the turbulence flow field is influenced by inlet jet significantly. During the early stage of the intake process, the increase of the inlet jet velocity leads to large velocity gradient and strong turbulence intensity. In the latter stage of the intake stroke, the inlet jet velocity decreases and it results in the decrease of turbulence intensity. The cycle-to-cycle variation is weak during the initial stage of the intake stroke, and the cyclic differences intensify during the latter stage of the intake stroke, which is the result of the interaction of inlet jet and vortices in the cylinder.
Authors
Citation
Jia, M., Lu, Z., Wang, T., Li, Y. et al., "Numerical Investigation of the Intake Flow of a Four-Valve Diesel Engine," SAE Technical Paper 2017-01-2211, 2017, https://doi.org/10.4271/2017-01-2211.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 |
Also In
References
- Kang , K. Y. and Reitz , R. D. Intake Flow Structure and Swirl Generation in a Four-Valve Heavy-Duty Diesel Engine Journal of Engineering for Gas Turbines & Power 122 570 578 2000
- Baum , E. , Peterson , B. , Böhm , B. , Dreizler , A. On The Validation of LES Applied to Internal Combustion Engine Flows: Part 1: Comprehensive Experimental Database Flow Turbulence and Combuste 92 269 297 2014
- Perini , F. , Zha , K. , Busch , S. , Miles , P. et al. Principal Component Analysis and Study of Port-Induced Swirl Structures in a Light-Duty Optical Diesel Engine SAE Technical Paper 2015-01-1696 2015 10.4271/2015-01-1696
- Maier , A. , Sheldrake , T. H. , Wilcock , D. Geometric Parameters Influencing Flow in an Axisymmetric IC Engine Inlet Port Assembly: Part I-Valve Flow Characteristics Journal of Fluids Engineering 122 4 650 657 2000
- Maier , A. , Sheldrake , T. H. , Wilcock , D. Geometric Parameters Influencing Flow in an Axisymmetric IC Engine Inlet Port Assembly: Part II-Parametric Variation of Valve Geometry Journal of Fluids Engineering 122 4 658 665 2000
- Weclas , M. The Influence of Radial Positioning Accuracy on LDA Velocity Measurements in a Valve Gap Measurement Science & Technology 7 4 605 614 1996
- Węcłaś , M. , Melling , A. , and Durst , F. Unsteady Intake Valve Gap Flows SAE Technical Paper 952477 1995 10.4271/952477
- Weclas , M. , Melling , A. , Durst , F. Flow separation in the inlet valve gap of piston engines Progress in Energy & Combustion Science 24 3 165 195 1998
- Lee , J. and Farrell , P. Intake Valve Flow Measurements of an IC Engine Using Particle Image Velocimetry SAE Technical Paper 930480 1993 10.4271/930480
- Freudenhammer , D. , Baum , E. , Peterson , B. , Böhm , B. et al. Volumetric Intake Flow Measurements of an IC Engine Using Magnetic Resonance Velocimetry Experiments in Fluids 55 1724 10.1007/s00348-014-1724-6
- Weclas , M. , Melling , A. , Durst , F. Combined application of surface flow visualization and laser-Doppler anemometry to engine intake flows Experiments in Fluids 15 4 323 331 1993
- Valentino , G. , Kaufman , D. , and Farrell , P. Intake Valve Flow Measurements Using PIV SAE Technical Paper 932700 1993 10.4271/932700
- Hessel , R. P. and Rutland , C. J. Intake Flow Modeling in a Four-Stroke Diesel Using KIVA-3 Journal of Propulsion and Power 11 2 378 384 1995
- Montorfano , A. , Piscaglia , F. , Schmitt , M. , Wright , Y. M. et al. Direct Numerical Simulation of Multiple Cycles in a Valve/Piston Assembly Physics of Fluids 26 3 035105 2014
- Hartmann , F. , Buhl , S. , Gleiss , F. , Barth , P. et al. Spatially Resolved Experimental and Numerical Investigation of the Flow through the Intake Port of an Internal Combustion Engine Oil & Gas Science & Technology 71 1 2 2016
- Yang , X. , Keum , S. , Kuo , T. Effect of Valve Opening/Closing Setup on Computational Fluid Dynamics Prediction of Engine Flows Journal of Engineering for Gas Turbines and Power 138 8 081503 2016
- Kuo , T. , Yang , X. , Gopalakrishnan , V. , Chen , Z. et al. Large Eddy Simulation (LES) for IC Engine Flows Oil Gas Sci. Technol.-Rev. IFP Energies nouvelles 69 61 81 2014
- Bottone , F. , Kronenburg , A. , Gosman , D. , Marquis , A. Large Eddy Simulation of Diesel Engine In-cylinder Flow Flow turbulence and combustion 88 1 233 253 2012
- Werner , H. , and Wengle , H. Large-Eddy Simulation of Turbulent Flow Over and Around a Cube in a Plate Channel Springer Berlin, Heidelberg 1993
- Pope , S. B. Ten Questions Concerning the Large-eddy Simulation of Turbulent Flows New journal of Physics 6 1 35 2004
- Mare , F. D. , Knappstein , R. , Baumann , M. Application of LES-quality Criteria to Internal Combustion Engine Flows Computers & Fluids 89 200 213 2014