This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
An Evaluation of Turbulent Kinetic Energy for the In-Cylinder Flow of a Four-Valve 3.5L SI Engine Using 3-D LDV Measurements
Annotation ability available
Sector:
Language:
English
Abstract
A better understanding of turbulent kinetic energy is important for improvement of fuel-air mixing, which can lead to lower emissions and reduced fuel consumption. An in-cylinder flow study was conducted using 1548 Laser Doppler Velocimetry (LDV) measurements inside one cylinder of a 3.5L four-valve engine. The measurement method, which simultaneously collects three-dimensional velocity data through a quartz cylinder, allowed a volumetric evaluation of turbulent kinetic energy (TKE) inside an automotive engine. The results were animated on a UNIX workstation, using a 3D wireframe model. The data visualization software allowed the computation of TKE isosurfaces, and identified regions of higher turbulence within the cylinder. The mean velocity fields created complex flow patterns with symmetries about the center plane between the two intake valves. High levels of TKE were found in regions of high shear flow, attributed to the collisions of intake flows. During the compression stroke the higher TKE was located around the momentary center of the cylinder volume. The TKE inside the cylinder decayed exponentially with time.
Recommended Content
Authors
Citation
Hascher, H., Jaffri, K., Novak, M., Lee, K. et al., "An Evaluation of Turbulent Kinetic Energy for the In-Cylinder Flow of a Four-Valve 3.5L SI Engine Using 3-D LDV Measurements," SAE Technical Paper 970793, 1997, https://doi.org/10.4271/970793.Also In
References
- Jaffri, K. Hascher, H.G. Novak, M. “Tumble and Swirl Quantification within a Motored Four-Valve SI Engine Cylinder Based on 3-D LDV Measurements,” SAE 970792
- Lee, K. Yoo, S.C. Stuecken, T. McCarrick, D. Schock, H. “An Experimental Study of In-Cylinder Air Flow in a 3.5L Four Valve SI Engine by High Speed Flow Visualization and Two-Component LDV Measurement,” SAE 930478
- Haworth, D. Sherif, H. Huebler, M. Chang, S. “Multidimensional Port-and-Cylinder Flow Calculations for Two- and Four-Valve-Per-Cylinder Engines: Influence of Intake Configuration on Flow Structure,” SAE 900257
- Yoo, S. Lee, K. Novak, M. Schock, H. “3D LDV Measurement of In-Cylinder Air Flow in a 3.5L Four-Valve SI Engine,” SAE 95648
- Potter, M. Foss, J. “Fluid Mechanics,” Great Lakes Press 1982
- Mueller, J.D. “Quantification of In-Cylinder Flow Characteristics with Laser Doppler Velocimetry,” Michigan State University 1995
- Hughes, W. Brighton, J. “Fluid Dynamics,” 2nd McGraw-Hill 1991
- Ozdor, N. Dulger, M. Sher, E. “An Experimental Study of the Cyclic Variability in Spark Ignition Engines,” SAE 960611
- Neusser, H.-J. Geiger, J. “Continuous Variable Tumble - A New Concept for Future Lean Burn Engines,” SAE 960607
- Stephenson, P.W. Claybaker, P.J. Rutland, C.J. “Modeling the Effects of Intake Turbulence and Resolved Flow Structures on Combustion Diesel Engines,” SAE 960634
- Goldstein, R.J. Adrian, J.R. “Fluid Mechanics Measurements,” Hemisphere Publishing Corporation 1983
- Carnahan, B. Luther Wilkens, J.O. “Applied Numerical Methods,” John Wiley & Sons, Inc. 1969