Cycle-Resolved LDV Measurements In a Motored Diesel Engine and Comparison with K-ε Model Predictions

Cycle-resolved LDV measurements of tangential mean velocities and turbulence intensities were made in a motored, single cylinder, Cummins NH diesel engine at 300 and 600 rpm. The measurements were made at eight locations in a plane 0.9 cm below the cylinder head. The combustion chamber and intake configuration of this low-swirl, low-squish engine were nearly identical to the stock configuration. For improved optical access, however, the compression ratio was lower in the test engine (10:1) than in the production engine (14.5:1). The measured turbulence intensities were compared to values computed with KIVA, an in-cylinder fluid dynamics flow code with a {kappa}-{epsilon} turbulence model. The measurements show that the mean velocity field is three-dimensional before TDC, consisting of both a weak swirling motion and a weak tumbling motion.

[1]  James H. Whitelaw,et al.  Measurements of the in-cylinder flow of a motored four-stroke reciprocating engine , 1981, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[2]  C. R. Ferguson,et al.  A Multidimensional Data Set for Diesel Combustion Model Validation: I - Initial Conditions, Pressure History and Spray Shapes , 1987 .

[3]  S. E. Tahry,et al.  Application of a Reynolds Stress Model to Engine-Like Flow Calculations , 1985 .

[4]  Frediano V. Bracco,et al.  LDV measurements in an engine with square and circular piston cups , 1987 .

[5]  F. V. Bracco,et al.  Computed and measured turbulence in axisymmetric reciprocating engines , 1983 .

[6]  Robert V. Edwards,et al.  Report of the Special Panel on Statistical Particle Bias Problems in Laser Anemometry , 1987 .

[7]  A. P. Watkins,et al.  Flow and heat transfer in piston/cylinder assemblies , 1977 .

[8]  Andrea Catania,et al.  Induction System Effects on Small-Scale Turbulence in a High-Speed Diesel Engine , 1987 .

[9]  A. A. Amsden,et al.  The KIVA-II computer program for transient multidimensional chemically reactive flows with sprays. , 1987 .

[10]  Frediano V. Bracco,et al.  Cycle-Resolved LDV Integral Length Scale Measurements In an I.C. Engine , 1988 .

[11]  W. G. Tiederman,et al.  Biasing correction for individual realization of laser anemometer measurements in turbulent flows , 1973 .

[12]  C. Arcoumanis,et al.  Squish and Swirl-Squish Interaction in Motored Model Engines , 1983 .

[13]  C. Arcoumanis,et al.  Fluid Mechanics of Internal Combustion Engines—a Review* , 1987 .

[14]  Claus Borgnakke,et al.  Measurements and predictions of the precombustion fluid motion and combustion rates in a spark ignition engine , 1983 .

[15]  H. G. Green,et al.  Velocity and concentration measurements in a model diesel engine , 1985 .

[16]  S. E. Tahry.  K-epsilon equation for compressible reciprocating engine flows , 1983 .

[17]  M. E. Hayder,et al.  A limit to TDC turbulence intensity in internal combustion engines , 1985 .

[18]  Andrea Catania,et al.  A Contribution to the Definition and Measurement of Turbulence in a Reciprocating I.C. Engine , 1985 .

[19]  A. D. Gosman,et al.  Flow in a Model Engine with a Shrouded Valve-A Combined Experimental and Computational Study , 1985 .