A Cycle-to-Cycle Variation Extraction Method for Flow Field Analysis in SI IC Engines Based on Turbulence Scales
Published January 15, 2019 by SAE International in United States
Downloadable datasets for this paper availableAnnotation of this paper is available
To adhere to stringent environmental regulations, SI (spark ignition) engines are required to achieve higher thermal efficiency. In recent years, EGR (exhaust gas recirculation) systems and lean-burn operation has been recognized as key technologies. Under such operating conditions, reducing CCV (cycle-to-cycle variation) in combustion is critical to the enhancement of overall engine performance. Flow-field CCV is one of the considerable factors affecting combustion in engines. Conventionally, in research on flow fields in SI engines, the ensemble average is used to separate the measured velocity field into a mean component and a fluctuation component, the latter of which contains a CCV component and a turbulent component. To extract the CCV of the flow field, previous studies employed spatial filter, temporal filter, and POD (proper orthogonal decomposition) methods. Those studies used a constant- separation filter size for the whole crank angle, although the turbulence scales change rapidly during the intake and compression stroke processes. Hence the definition of filter size has some room to be explored in order to take account of these features. The objective of this research is to improve the method of separating the CCV component using turbulence scales. For this purpose, high-speed PIV measurement was conducted on the symmetrical vertical plane for an optical IC engine at repetition rates of 12 kHz (1 C.A. deg. resolution) for the whole in-cylinder area and 48 kHz (0.25 C.A. deg. resolution) for the plug position. The measured data were separated into CCV and turbulent components by using the proposed filter, whose size was selected adaptively considering the integral time scale of the turbulent flow. The effect of time resolution on the filter size was then elucidated.
CitationMatsuda, M., Yokomori, T., Minamoto, Y., Shimura, M. et al., "A Cycle-to-Cycle Variation Extraction Method for Flow Field Analysis in SI IC Engines Based on Turbulence Scales," SAE Technical Paper 2019-01-0042, 2019, https://doi.org/10.4271/2019-01-0042.
Data Sets - Support Documents
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- Arcoumanis, C. and Whitelaw, H. , “Fluid Mechanics of Internal Combustion Engines: A Review,” Part C: Mech. Eng. Sci. 201:57-74, 1987, doi:10.1243/PIME_PROC_1987_201_087_02.
- Takahashi, D., Nakata, K., Yoshihara, Y., and Omura, T. , “Combustion Development to Realize High Thermal Efficiency Engines,” SAE Int. J. Engines 9(3):1486-1493, 2016, doi:10.4271/2016-01-0693.
- Wada, Y., Nakano, K., Mochizuki, K., and Hata, R. , “Development of a New 1.5L I4 Turbocharged Gasoline Direct Injection Engine,” SAE Technical Paper 2016-01-1020, 2016, doi:10.4271/2016-01-1020.
- Schulza, C. and Sick, V. , “Tracer-LIF Diagnostics: Quantitative Measurement of Fuel Concentration, Temperature and Fuel/Air Ratio in Practical Combustion Systems,” Progress in Energy and Combustion Science 31(1):75-121, 2005, doi:10.1016/j.pecs.2004.08.002.
- Bode, J., Schorrb, J., Krüger, C., Dreizler, A. et al. , “Influence of Three-Dimensional In-Cylinder Flows on Cycle-to-Cycle Variations in a Fired Stratified DISI Engine Measured by Time-Resolved Dual-Plane PIV,” Proceedings of the Combustion Institute 36:3477-3485, 2017.
- Müller, S., Böhm, B., Gleißner, M., Arndt, S. et al. , “Analysis of the Temporal Flame Kernel Development in an Optically Accessible IC Engine Using High-Speed OH-PLIF,” Appl Phys B 100:447-452, 2010, doi:10.1007/s00340-010-4134-3.
- Pope, S. , Turbulent Flows (Cambridge University Press, 2000).
- Tennekes, H. and Lumley, J. , A First Course in Turbulence (The MIT Press, 1972).
- Towers, P. and Towers, E. , “Cyclic Variability Measurements in IC Engine In-Cylinder Flows Using High Speed PIV,” Meas. Sci. Technol. 15:1917, 2004, doi:10.1088/0957-0233/15/9/032.
- Okura, Y., Segawa, M., Onimaru, H., Urata Y. et al. , “Analysis of In-Cylinder Flow for a Boosted GDI Engine Using High Speed Particle Image Velocimetry,” in 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics Lisbon, 2014.
- Aleiferis, P.G., Behringer, M.K., and Malcolm, J.S. , “Integral Length Scales and Time Scales of Turbulence in an Optical Spark-Ignition Engine,” Flow Turbulence Combust 98:523-577, 2017, doi:10.1007/s10494-016-9775-9.
- Reuss, D. , “Cyclic Variability of Large-Scale Turbulent Structures in Directed and Undirected IC Engine Flows,” SAE Technical Paper 2000-01-0246, 2000, doi:10.4271/2000-01-0246.
- Muller, H.R.S., Bohml, B., Gleißner, M., Grzeszik, R. et al. , “Flow Field Measurements in an Optically Accessible Direct-Injection Spray-Guided Internal Combustion Engine Using High-Speed PIV,” Exp. Fluids 48:281-290, 2010, doi:10.1007/s00348-009-0742-2.
- Karhoff, D., Bücker, I., Klaas, M., and Schröder, W. , “Time-Resolved Stereoscopic PIV Measurements of Cyclic Variations in an Internal Combustion Engine,” in 10th International Symposium on Particle Image Velocimetry - PIV13, 2013.
- Vu, T. and Guibert, P. , “Proper Orthogonal Decomposition Analysis for Cycle-to-Cycle Variations of Engine Flow. Effect of a Control Device in an Inlet Pipe,” Exp. Fluids 52:1519-1532, 2012, doi:10.1007/s00348-012-1268-6.
- Kolmogorov, A.N. , “A Refinement of Previous Hypotheses Concerning the Local Structure of Turbulence in a Viscous Incompressible Fluid at High Reynolds Number,” J. Fluid Mech. 13:82-85, 1962.
- Pinsky, M., Shapiro, M., Khain, A., and Wirzberger, H. , “A Statistical Model of Strains in Homogeneous and Isotropic Turbulence,” Physica D: Nonlinear Phenomena 191(3-4):297-313, 2004, doi:10.1016/j.physd.2003.12.008.
- Mi, J., Xu, M., and Zhou, T. , “Reynolds Number Influence on Statistical Behaviors of Turbulence in a Circular Free Jet,” Phy. Fluids 25:075101, 2013, doi:10.1063/1.4811403.
- Tang, S.L., Antonia, R.A., Djenidi, L. et al. , “Reappraisal of the Velocity Derivative Flatness Factor in Various Turbulent Flows,” J. Fluid Mech. 847:244-265, 2018, doi:10.1017/jfm.2018.307.
- Jung, D., Sasaki, K., Sugata, K., Matsuda, M. et al. , “Combined Effects of Spark Discharge Pattern and Tumble Level on Cycle-to-Cycle Variations of Combustion at Lean Limits of SI Engine Operation,” SAE Technical Paper 2017-01-0677, 2017, doi:10.4271/2017-01-0677.
- Matsuda, M., Yokomori, T., and Iida, N. , “Investigation of Cycle-to-Cycle Variation of Turbulent Flow in a High-Tumble SI Engine,” SAE Technical Paper 2017-01-2210, 2017, doi:10.4271/2017-01-2210.
- Shimura, M., Yoshida, S., Osawa, K., Minamoto, Y. et al. , “Micro Particle Image Velocimetry Investigation of Near-Wall Behaviors of Tumble Enhanced Flow in an Internal Combustion Engine,” International Journal of Engine Research, 2018, doi:10.1177/1468087418774710.