This paper presents the comparison between measured and predicted results of the in-cylinder tumble flow generated by a port-valve-liner assembly on a steady-flow test bench. The purpose was to advance the understanding of the stationary turbulence process via experimental and computational techniques in the same time. A baseline single-cylinder 4-stroke motorcycle engine was chosen. Its liner was replaced by a transparent acrylic-plastic tube and the piston was removed. This was to focus the research on the tumble flow generated by the geometry of its port, the passage of the canted inlet valve, and a dome-shaped combustion chamber. The in-cylinder turbulent flow field was measured via a 3-component laser Doppler velocimeter (LDV) point by point. A simultaneous computer simulation was carried out to predict the in-cylinder flow field of the same engine under the same operating condition, using KIVA3V—the most recent version of the KIVA code. The mean speed, turbulence intensity, tumble ratio, swirl ratio, and vortex circulation from both skills were all compared. A reasonably good level of agreement has been achieved. Both modern techniques are also validated.

Issue Section:
Internal Combustion Engines: Flow, Heat Transfer, and Combustion
Keywords:
turbulence, engines, flow measurement, air, engineering
Topics:
Cylinders, Engines, Flow (Dynamics), Turbulence, Simulation, Valves, Computer simulation, Domes (Structural elements), Vortices, Combustion chambers
1.
Zhao, F. Q., Lai, M. C., and Harrington, D. L., 1997, “A Review of Mixture Preparation and Combustion Control Strategies for Spark-Ignition Direct-Injection Gasoline Engines,” SAE Paper 970627.
2.
Hill
,
P. G.
, and
Zhang
,
D.
,
1994
, “
The Effects of Swirl and Tumble on Combustion in Spark-Ignition Engines
,”
Prog. Energy Combust. Sci.
,
20
, pp.
373
–
429
.
3.
Taghavi
,
R.
, and
Dupont
,
A.
,
1989
, “
Investigation of the Effect of Inlet Port on the Flow in a Combustion Chamber Using Multidimensional Modeling
,”
ASME J. Eng. Gas Turbines Power
,
111
, No.
7
, pp.
479
–
484
.
4.
Amsden, A. A., O’Rouke, P. J., Bulter, T. D., Meintjes, K., and Fansler, T. D., 1992, “Comparisons of Computed and Measured Three-Dimensional Velocity Fields in a Motored Two-Stroke Engine,” SAE Paper 920418.
5.
Hessel
,
R. P.
, and
Rutland
,
C. J.
,
1995
, “
Intake Flow Modeling in a Four-Stroke Diesel Using KIVA-3
,”
J. Propul. Power
,
11
, No.
2
, pp.
378
–
384
.
6.
Kong, S. C., and Hong, C. W., 1997, “Comparisons of Computed and Measured Flow Processes in a Four-Stroke Engines,” Paper No. 97-ICE-49, ICE-Vol. 29-2, 1997 ASME Fall Technical Conference, ASME, New York.
7.
Hampson, G. J., and Reitz, R. D., 1998, “Two-Color Imaging of In-Cyliner Soot Concentration and Temperature in a Heavy-Duty DI Diesel Engine With Comparison to Multidimensional Modeling for Single and Split Injections,” SAE Paper 980524.
8.
O’Connor, J. F., and McKinley, N. R., 1998, “Comparisons of Intake Port CFD Flow Predictions Using Automatic Brick Meshing With Swirl Laser Sheet and LDA Flow Measurements,” SAE Paper 980129.
9.
Le Coz, J. F., Henriot, S., Pinchon, P., 1990, “An Experimental and Computational Analysis of the Flow Field in a Four-Valve Spark Ignition Engine-Focus on Cycle-Resolved Turbulence,” SAE Paper 900056.
10.
Amsden, A. A., 1997, “KIVA3V: A Block-Structured KIVA Program for Engines With Vertical or Canted Valves,” Los Alamos National Lab, LA-13313-MS.
11.
Pao, R. H. F., 1967, Fluid Dynamics, Charles E. Merrill Books, Columbus, OH.
12.
Amsden, A. A., 1993, “KIVA-3: A KIVA Program With Block-Structured Mesh for Complex Geometries,” Los Alamos National Lab, LA-12503-MS.
Copyright © 2001
 by ASME
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