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Cycle-Resolved Velocity and Turbulence Measurements Near the Cylinder Wall of a Firing S.I. Engine
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Abstract
Laser Doppler velocimetry has been used to make cycle-resolved velocity and turbulence measurements in a homogeneous-charge, spark-ignition engine. The engine had a ported intake and disc-shaped chamber with a compression ratio of 7.5 to 1. It was operated at a speed of 1200 rpm and with a TDC swirl number of 4. A stoichiometric propane-air mixture was used, and ignition was near the wall. Measurements of the tangential velocity component were made in both firing and non-firing cycles at nine spatial locations along a radius 180 degrees downstream of the spark. The radial velocity component was also measured at four of the locations. All measurements were made in the center of the clearance height. Tangential component measurements were made as close as 0.5mm from the cylinder wall, and the radial component was measured as close as 1.5mm from the wall. It was found that a very thin boundary layer exists both with and without combustion; the tangential velocity at a location 0.5mm from the wall was greater than 90 percent of the maximum value reached across the chamber. Turbulence intensity was found to increase little immediately ahead of the flame, but to increase significantly across the flame; it was higher in the burned gas than in the unburned gas at all radial positions examined. The near-wall turbulence intensity was isotropic to within 20 percent (as near as 1.5mm from the wall). The measured tubulence intensity increased sharply near the wall indicating a significant amount of wall generated turbulence.
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Hall, M. and Bracco, F., "Cycle-Resolved Velocity and Turbulence Measurements Near the Cylinder Wall of a Firing S.I. Engine," SAE Technical Paper 861530, 1986, https://doi.org/10.4271/861530.Also In
References
- Witze P.O. “Decay of Swirling. Flow During Compression,” Comparison Between Measurements and Analyses of Fluid Motion in Internal Combustion Engines, Sandia National Laboratories Energy Report 28 29 1981
- Hall M.J. Bracco F.V. Santavicca D.A. “Cycle-Resolved velocity and Turbulence Measurements in an IC Engine with Combustion,” SAE Paper No. 860320 1986
- Lancaster D.R. “Effects of Engine Variables on Turbulence, in a Spark-Ignition Engine,” SAE Paper No. 760159 1976
- Rask R.B. “Laser Doppler Anemometer Measurements in an Internal combustion Engine,” SAE Paper No. 790094 1979
- Martin J.K. Witze P.O. Borgnakke C. “Combustion Effects on the Preflame Flow Field in a Research Engine,” SAE Paper NO- 850122 1985
- Fansler T.D. “Laser Velocimetry Measurements of Swirl and Squish Flows in an Engine with a cylindrical Piston Bowl,” SAE paper No. 850124 1985
- Boppy S. Vafidis C. Whitelaw J.H. “The Effect of Engine Speed on the TDC Flow in a Motored Reciprocating Engine,” SAE Paper NO. 860023 1986
- Seminov E.S. “Studies of Turbulent Gas Flow in Piston engine,” Otdelenie Tekhnicheskikh Nauk, No.8 (NASA technical Translation F97) 1958
- Reynolds W.C. “Modeling- of Fluid Motions in Engines - An Introductory Overview,” Modeling in Reciprocating Engines November 1978 Mattabi J.N. Amann C.A. Plenum Press New York, NY 41 68 1980
- Bracco F.V. “Modeling and Diagnostics of Combustion in Spark-Ignition Engines,” COMODIA 85 Symposium Tokyo 1 14 September 1985
- Liou T.M. Santavicca D.A. “Cycle Resolved LDV Measurements in a Motored IC Engine,” Engineering Application of Laser Velocimetry Coleman H.W. Pfund P.A. New York ASME 1982
- Liou T.M. “Laser Doppler Velocimetry Measurements in Valved and Ported Engines,” Ph.D. Thesis No. 1602 Princeton University May 1983
- Asanuma T. Obokata T. “Gas Velocity Measurement of a Motored and Firing Engine by Laser Anemometry,” SAE Paper No. 790096 1979
- Wigley Patterson Renshaw “Swirl Velocity Measurements in a Firing Production Diesel Engine,” Fluid Mechanics of Combustion Systems Morel T. Lohraan R.P. Rachley J.M. ASME 1981
- Cole J.B. Swords M.D. “An Investigation of the Ignition Process in a Lean-Burning Engine Using Conditionally Sampled Laser-Doppler Anemometry,” Trans. SAE 89 260 1980
- Witze P.O. Baritaud T.A. “Influence of Combustion on Laser Doppler Velocimeter Signal Quality in a Spark Ignition Engine,” International Symposium on Laser Anemometry Dybbs A. Pfund P.A. ASMS 1981
- Bracco F.V. “Scaling of some Flowfields with Flames,” Combustion Modeling in Reciprocating Engines Measurements J.N. Amann C.A. Plenum Publishing Co. New York, N.Y. 1980
- Witze P.O. Mendes-Lopes J.M.C. “Direct Measurement of the Turbulent Burning Velocity in a Homogeneous-Charge Engine,” SAE International Fuels and Lubricants Meeting and Exposition Philadelphia, PA October 1986