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Late-Cycle Turbulence Generation in Swirl-Supported, Direct-Injection Diesel Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 04, 2002 by SAE International in United States
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Cycle-resolved analysis of velocity data obtained in the re-entrant bowl of a fired high-;speed, direct-injection diesel engine, demonstrates an unambiguous, approximately 100% increase in late-cycle turbulence levels over the levels measured during motored operation. Model predictions of the flow field, obtained employing RNG k-ε turbulence modeling in KIVA-3V, do not capture this increased turbulence. A combined experimental and computational approach is taken to identify the source of this turbulence. The results indicate that the dominant source of the increased turbulence is associated with the formation of an unstable distribution of mean angular momentum, characterized by a negative radial gradient. The importance of this source of flow turbulence has not previously been recognized for engine flows. The enhanced late-cycle turbulence is found to be very sensitive to the flow swirl level. Furthermore, experiments conducted in a N2 atmosphere, in which the injected fuel does not burn, indicate that buoyant turbulence production likely plays a role between approximately 10 and 20 CAD, but is not primarily responsible for the late-cycle increase. Finally, combustion induced gas expansion is found to produce a brief increase in turbulence near the time of the premixed burn.
- Paul C. Miles - Sandia National Laboratories
- Marcus Megerle - Sandia National Laboratories
- Joseph Hammer - Sandia National Laboratories
- Zachary Nagel - University of Wisconsin - Engine Research Center
- Rolf D. Reitz - University of Wisconsin - Engine Research Center
- Volker Sick - University of Michigan
CitationMiles, P., Megerle, M., Hammer, J., Nagel, Z. et al., "Late-Cycle Turbulence Generation in Swirl-Supported, Direct-Injection Diesel Engines," SAE Technical Paper 2002-01-0891, 2002, https://doi.org/10.4271/2002-01-0891.
Compression Ignition Combustion and In-Cylinder Diesel Particulates and Nox Control
Number: SP-1698 ; Published: 2002-03-04
Number: SP-1698 ; Published: 2002-03-04
- Ikegami, M., “Role of Flows and Turbulent Mixing in Combustion and Pollutant Formation in Diesel Engines,” COMODIA 90: Proceedings of the International Symposium on Diagnostics and Modeling of Combustion in Internal Combustion Engines, 3-5 September, Kyoto, Japan, 1990.
- Miles, P., Megerle, M., Sick, V., Richards, K., Nagel, Z., and Reitz, R., “The Evolution of Flow Structures and Turbulence in a Fired HSDI Diesel Engine,” SAE Paper No. 2001-01-3501, 2001.
- Ikegami, M., Shioji, M., and Kimoto, T., “Diesel Combustion and the Pollutant Formation as Viewed from Turbulent Mixing Concept,” SAE Paper No. 880425, SAE Trans. v.97, 1988.
- Liou, T.-M. and Santavicca, D.A., “Cycle Resolved Turbulence Measurements in a Ported Engine With and Without Swirl,” SAE Paper No. 830419, SAE Trans. v.92, 1983.
- zur Loye, A.O., Siebers, D.L., McKinley, T.L., Ng, H.K., and Primus, R.J., “Cycle-Resolved LDV Measurements in a Motored Diesel Engine and Comparison with k-ε Model Predictions,” SAE Paper No. 890618, SAE Trans. v.98, 1989.
- Fansler, T.D. and French, D.T., “Cycle-Resolved Laser-Velocimetry Measurements in a Reentrant-Bowl-in-Piston Engine,” SAE Paper No. 880377, SAE Trans. v.97, 1988.
- Dec, J.E. “A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging,” SAE Paper No. 970873, SAE Trans. v.106, 1997.
- Amsden, A. A., “KIVA-3V: A Block-Structured KIVA Program for Engines with Vertical or Canted Valves,” Los Alamos National Laboratory Report No. LA-13313-MS, 1997.
- Pope, S.B., Turbulent Flows, Cambridge University Press, 2000.
- Batchelor, G.K., An Introduction to Fluid Mechanics, Cambridge University Press, 1967.
- Gosman, A.D., “Flow Processes in Cylinders,” in Thermodynamics and Gas Dynamics of Internal Combustion Engines, Vol. 2, eds. Horlock, J.H. and Winterbone, D., Oxford University Press, 1986.
- Fansler, T.D., and French, D.T., “Swirl, Squish and Turbulence in Stratified-Charge Engines: Laser Velocimetry Measurements and Implications for Combustion,” SAE Paper No. 870371, SAE Trans. v.96, 1987.
- Lumley, J.L., Engines: An Introduction, Cambridge University Press, 1999.
- Sloan, D.G., Smith, P.J., and Smoot, L.D., “Modeling of Swirl in Turbulent Flow Systems,” Prog. Energy Combust. Sci., Vol. 12, pp.163-250, 1986.
- Townsend, A.A., The Structure of Turbulent Shear Flow, Cambridge University Press, 1976.
- Tennekes, H. and Lumley, J.L., A First Course in Turbulence, MIT Press, 1972.
- Han, Z. and Reitz, R.D., “Turbulence Modeling of Internal Combustion Engines Using RNG k-ε Models,” Combust. Sci. and Tech., v.106, pp.267-295, 1995.
- Kong, S.-C., Han, Z., and Reitz, R.D., “The Development and Application of a Diesel Ignition and Combustion Model for Multidimensional Engine Simulation,” SAE Paper No. 950278, SAE Trans. v.104, 1995.
- Burgess, D.E. and O'Rourke, P.J., “Modeling Turbulence in Flows with a Strong Rotational Component,” Los Alamos National Laboratory Report No. LA-12552-MS, 1993.