This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Time-Frequency Spectral Stucture of Turbulence in an Automotive Engine
Annotation ability available
Sector:
Language:
English
Abstract
The results of an experimental study on the statistical structure of turbulence in an automotive engine are reported, with specific reference to the time-frequency domains. Autocorrelation and autospectral density coefficients were evaluated in consecutive crank-angle intervals throughout the induction and compression strokes. Eulerian time scales were obtained on the analogy of both the micro and integral time scales of turbulence for stationary flows.
The spatial distribution of the turbulence structure was investigated in the combustion chamber of a diesel engine with a shallow in-piston bowl and two tangential intake ducts. The study was carried out for different swirl flow conditions, produced by deactivating one intake duct and/or by changing the engine speed. The velocity data were acquired using an advanced HWA technique, under motored conditions.
The method of time-frequency spectral analysis used was previously developed in order to estimate the average statistical properties of segmented nonstationary sample records. It is based on an alternative definition of the autocorrelation coefficient so as to reduce this to an even function of the separation time (over which the turbulent fluctuation is correlated), independent of the time instant, within specific correlation periods during the engine cycle. This procedure was applied to both the cycle-resolved turbulent fluctuation and the instantaneous velocity fluctuation, which represents turbulence in the more conventional sense.
An insight is also given into the normalized probability density distributions of these fluctuations.
Recommended Content
Authors
Citation
Catania, A., Dongiovanni, C., and Mittica, A., "Time-Frequency Spectral Stucture of Turbulence in an Automotive Engine," SAE Technical Paper 920153, 1992, https://doi.org/10.4271/920153.Also In
References
- Catania, A.E. Mittica, A. 1989 “Extraction Techniques and Analysis of Turbulence Quantities from In-Cylinder Velocity Data,” ASME Journal of Engineering for Gas Turbines and Power 111 466 478
- Catania, A.E. Mittica, A. 1990 “Autocorrelation and Autospectra Estimation of Reciprocating Engine Turbulence,” ASME Journal of Engineering for Gas Turbines and Power 112 357 368
- Fraser, R.A. Bracco, F.V. 1989 “Cycle-Resolved LDV Integral Length Scale Measurements Investigating Clearance Height Scaling, Isotropy, and Homogeneity in an I.C. Engifie,” SAE Paper No. 890615
- Ikegami, M. Shioji Nishimoto, K. 1987 “Turbulence Intensity and Spatial Integral Scale During Compression and Expansion Strokes in a Four-Cycle Reciprocating Engine,” SAE Paper No. 870372
- Dinsdale, S. Roughton, A. Collings, N. 1988 “Length Scale and Turbulence Intensity Measurements in a Motored Internal Combustion Engine,” SAE Paper No. 880380
- Glover, A.R. Hundleby, G.E. Hadded, O. 1988 “An Investigation into Turbulence in Engines Using Scanning LDA,” SAE Paper No. 880378
- Reuss, D.L. Adrian, R.J. Landreth, C.C. French, D.T. Fansler, T.D. 1989 “Instantaneous Planar Measurements of Velocity and Large-Scale Vorticity and Strain Rate in an Engine Using Particle-Image Velocimetry,” SAE Paper No. 890616
- Hilton, A.D.M. Roberts, J.B. Hadded, O. 1991 “Autocorrelation Based Analysis of Ensemble Averaged LDA Engine Data for Bias-Free Turbulence Estimates: A Unified Approach,” SAE Paper No. 910479
- Bendat, J.S. Piersol, A.G. 1986 “Random Data: Analysis and Measurement Procedures,” 2nd John Wiley & Sons
- Witze, P.O. 1977 “Measurements of the Spatial Distribution and Engine Speed Dependence of Turbulent Air Motion in an I.C. Engine,” Trans SAE , Paper No. 770220
- Fansler, T.D. French, D.T. 1988 “Cycle-Resolved Laser-Velocimetry Measurements in a Reentrant-Bowl-in-Piston Engine,” SAE Paper No. 880377
- Liou, T.-M. Santavicca, DA. 1985 “Cycle Resolved LDV Measurements in a Motored IC Engine,” ASME Journal of Fluids Engineering 107 232 240
- Hinze, J.O. 1975 “ Turbulence ,” Mc GrawHill
- Bendat, J.S. Piersol, A.G. 1980 “ Engineering Applications of Correlation and Spectral Analysis ,” John Wiley & Sons
- Catania, A.E. Dongiovanni, C. Mittica, A. 1990 “Further Investigation into the Statistical Properties of Reciprocating Engine Turbulence,” COMODIA 90 JSME 449 456 Kyoto, Japan
- Catania, A.E. Mittica, A. 1985 “Cycle-by-Cycle, Correlation and Spectral Analysis of I.C. Engine Turbulence,” Flows in Internal Combustion Engines - III 28 Uzkan T. Tiederman W.G. Novak J.M. ASME New York
- Catania, A.E. Mittica, A. 1987 Induction System Effects on Small-Scale Turbulence in a High-Speed Diesel Engine,” ASME Journal of Engineering for Gas Turbines and Power 109 491 502
- Catania, A.E. Mittica, A. 1985 “A Contribution to the Definition and Measurement of Turbulence in a Reciprocating I.C. Engine,” ASME Diesel & Gas Engines Symposium, ETCE , Paper No. 85-DGP-12
- Kampè de Fèrie, L 1957 “La Notion de Moyenne dans La Théorie de la Turbulence (The Notion of Average in the Turbulence Theory),” Rend. Sem. Mat. e Fis . 27 Milano
- Monin, A.S. Yaglom, A.M. 1971 “ Statistical Fluid Mechanics ,” MIT Press Cambridge, MA
- Lancaster, D.R. 1976 “Effects of Engine Variables on Turbulence in a Spark-Ignition Engine,” Trans. SAE , Paper No. 760159
- Rask, R.B. 1981 “Comparison of Window, Smoothed-Ensemble, and Cycle-by-Cycle Data Reduction Techniques for Laser Doppler Anemometer Measurements of In-Cylinder, Velocity,” Fluid Mechanics of Combustion Systems Morel T. Lohmann R.P. Rackley J.M. ASME New York
- Daneshyar, H. Fuller, D.E. 1986 Definition and Measurement of Turbulent Parameters in Reciprocating I.C. Engines,” SAE Paper No. 861529
- Catania, A.E. 1985 “Induction System Effects on the Fluid-Dynamics of a D.I. Automotive Diesel Engine,” ASME Diesel & Gas Engines Symposium, ETCE , Paper No. 85-DGP-11
- McCartin, B.J. 1981 “Theory, Computation and Application of Exponential Splines,”
- Reynolds, W.C. 1980 “Modeling of Fluid Motions in Engines - An Introductory Overview,” Combustion Modeling in Reciprocating Engines Mattavi J.N. Amann C.A. Plenum Press New York
- Arcoumanis, C. Hadjiapostolou, A. Whitelaw, J. H. 1987 “Swirl Center Precession in Engine Flows,” SAE Paper No. 870370
- Saxena, V. Rask, R.B. 1987 “Influence of Inlet Flows on the Flow Field in an Engine,” SAE Paper No. 870369
- Matekunas, F.A. 1983 “Models and Measure of Cyclic Combustion Variability,” General Motors Internal Report, GMR-4239, SAE Paper No. 830337
- Evans, R.L. Dohring, K.W. 1987 “A Rapid Intake and Compression Machine for Fundamental Combustion Research,” ASME Internal Combustion Engine Symposium, ETCE , Paper NO. 87-FE-9
- Tritton, D.J. 1977 “ Physical Fluid Dynamics ,” Van Nostrand Reinhold
- Adrian, R.J. Johnson, R.E. Jones, B.G. Merati, P. Tung, A.T.-C. 1984 “Aerodynamic Disturbances of Hot-Wire Probes and Directional Sensitivity,” J. Phys. E: Sci. Instrum . 17 62 71
- McComb, W.D. 1990 “ The Physics of Fluid Turbulence ,” Clarendon Press Oxford
- Catania, A.E. 1982 “3-D Swirling Flows in an Open-Chamber Automotive Diesel Engine with Different Induction Systems,” Flows in I.C. Engines Uzkan T. ASME New York
- Witze, P.O. 1980 “A Critical Comparison of Hot-Wire Anemometry and Laser Dopplier Velocimetry for I.C. Engine Applications,” Trans. SAE , Paper No. 800132
- Tennekes, H. Lumley, J.L. 1972 “ A First Course in Turbulence ,” MIT Press Cambridge, MA
- Rader, C.M. 1970 “An Improved Algorithrn for High Speed Autocorrelation with Applications to Spectral Estimation,” IEEE Trans. Audio Electroacustics AU-18 4 439 441
- Rabiner, L.R. Schafer, R.W. Dlugos, D. 1979 “Correlation Method for Power Spectrum Estimation,” IEEE Programs for Digital Signal Processing
- Lesicur, M. 1987 “ Turbulence in Fluids ,” Martinus Nijhoff Publishers