This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Interpretation of Air Motion in Reentrant Bowl in-Piston Engine by Estimating Reynolds Stresses
Annotation ability available
Sector:
Language:
English
Abstract
The present paper aims at investigating the flow field behavior within a reciprocating engine under motoring conditions.
Simultaneous two velocity components of the air velocity were acquired at different engine speeds within the cylinder at different radii from the cylinder axis. Mean motion, integral time scales and Reynolds shear stresses, for the radial and tangential components, were estimated from the instantaneous velocity data by applying an ensemble averaging technique. The integral time scale was obtained from the single point time autocorrelation function whereas, the Reynolds shear stresses were computed through the estimate of the degree of the fluctuations correlation.
Tests, carried out at 1,000, 1,500, and 2,000 rpm, showed that the tangential mean motion scales approximately with engine speed whereas a radial inward motion can be observed during the last part of compression. The integral time scale shows a global decrease along the compression and an approximate inverse scaling trend with engine speed. Further, an increase of the Reynolds shears stress, at the end of compression, was observed.
Authors
Topic
Citation
Auriemma, M., Corcione, F., Macchioni, R., and Valentino, G., "Interpretation of Air Motion in Reentrant Bowl in-Piston Engine by Estimating Reynolds Stresses," SAE Technical Paper 980482, 1998, https://doi.org/10.4271/980482.Also In
References
- Launder, B.E. Spalding, D.B. The Numerical Computation of Turbulent Flows Computer Methods in App. Mech. and Eng. 3 269 289 1974
- El Tahry, S.H. Haworth, D.C. Directions in Turbulence Modeling for In-Cylinder Flows in Reciprocating Engines J. Propulsion and Power 8 1040 1992
- Kassinos, S.C. Reynolds, W.C. A Structure Based Model for the Rapid Distortion of Homogeneous Turbulence Rept. TF-61, Dept. Mech. Engr. Stantford Univ. 1994
- Catania, F.E. Induction System Effects on the Fluid-Dynamics of a D.I. Automotive Diesel Engine ASME Diesel & Gas Engines Symposium, ETCE, 85-DGP-11 1985
- Catania, F.E. Mittica, A. 1990 Autocorrelation and Autospectra Estimation of Reciprocating Engine Turbulence Energy-sources Technology Conference and Exhibition New Orleans Paper 90-ICE-12
- Tindal, M.J. Williams, T.J. Aldoory, M. 1982 The Effect of Inlet Port Design on Cylinder Gas Motion in Direct Injection Diesel Engines Flows in I.C. Engines ASME New York
- Bertoli, C. Corcione, F.E. Police, G. Valentino, G. Effect of Inlet Port Geometry on Turbulent Air Flow in the Combustion Chamber of a Diesel Engine Int. Symposium on Diagnostic and Modeling of Combustion in Reciprocating Engines 273 283 Tokyo
- Fansler, T.D French, D.T. 1988 Cycle-Resolved Laser-Velocimetry Measurements in a Reentrant-Bowl-in-Piston Engine SAE paper 880377
- Valentino G. Auriemma M. Corcione F.E. Macchioni R. Seccia G. Evaluation of Time and Spatial Turbulence Scales in a D.I. Diesel Engine Eight International Symposium on Applications of Laser Techniques to Fluid Mechanics July 8-11 1996 Lisbon, Portugal
- Auriemma, M. Corcione, F.E. Macchioni, R. Seccia, G. Valentino, G. 1996 LDV Measurements of Integral Length Scales in an IC Engine SAE 961161
- Foster, D.E. Witze, P.O. Two-Component Laser Doppler Velocimeter Measurements in a Spark Ignition Engine SANDIA, SAND87-8817 1987
- Dimopoulos, P. Boulouchos, K. Reynolds Stress Components in the Flow Field of a Motored Reciprocating Engine SAE paper 950725 1995
- Hinze, J.O. 1975 Turbulence McGraw-Hill New York
- Tennekes, H. Lumley, J.L. A First Course in Turbulence The MIT Press 1992
- Heywood J.B. Internal Combustion Engine Fundamentals McGraw Hill 1988
- Corcione, F.E. Valentino, G. 1994 Analysis of In-Cylinder Flow Processes by LDA Combustion & Flame 99: 387-394
- Ikegami, M. Shioji, M. Nishimoto, K. 1987 Turbulence Intensity and Spatial Integral Scale During Compression and Expansion Strokes in a Four-Cycle Reciprocating Engine SAE paper 870372
- Auriemma, M. Corcione, F.E. Macchioni, R. Valentino, G. Reynolds Stresses Estimate in a Motored I.C. Engine by LDA, ICE97, Capri 17-20 September 1997