THERMAL SCIENCE

International Scientific Journal

External Links

SPATIAL FLOW VELOCITY DISTRIBUTION AROUND AN INLET PORT/VALVE ANNULUS

ABSTRACT
An experimental investigation of the airflow through inlet port of a standard production direct injection diesel engine is presented. The investigation comprises mass flow rate and pressure drop measurements at fixed valve lifts, and spatial distributions of mean and r.m.s. velocity components around the port/valve annulus measured under steady flow conditions by special designed miniature hot-wire anemometer X probe. The results show that the velocity field is distributed non-uniformly across the valve gap and around valve periphery. Nonuniformity is more expressed at higher valve lifts. Flow instability in a jet leaving the port (jet flapping) is also evident since the skewness and kurtosis of the velocity probability distribution function depart from the Gaussian form. The presented experimental method, based on the application of miniature multiple hot-wire probes, makes possible investigation of flow performances of an inlet port and poppet valve assembly of a production engine head without any modification for ensuring an optical access within the port/cylinder.
KEYWORDS
PAPER SUBMITTED: 2007-07-16
PAPER REVISED: 2007-10-19
PAPER ACCEPTED: 2008-02-18
DOI REFERENCE: https://doi.org/10.2298/TSCI0801073P
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2008, VOLUME 12, ISSUE 1, PAGES [73 - 83]
REFERENCES
  1. Fukutani, I., Watanabe, E., Air Flow Through Poppet Inlet Valves - Analysis of Static and Dynamic Flow Coefficients, SAE paper 820154, 1982
  2. Desantes, J. M., Benajes, J., Urchueguia, J., Evaluation of the Non-Steady Flow Produced by Intake Ports of Direct Injection Diesel Engines, Experiments in Fluids, 19 (1995), 1, pp. 51-60
  3. Smith, L. A., Fickenscher, T., Osborne, R. P., Engine Breathing - Steady Speed Volumetric Efficiency and Its Validity under Transient Engine Operation, SAE paper 1999-01-0212, 1999
  4. Bicen, A. F., Vafidis, C., Whitelaw, J. H., Steady and Unsteady Airflow Through the Intake Valve of a Reciprocating Engine, J. Fluids Engng, 107 (1985), 3, pp. 413-420
  5. Khalighi, B., El Tahry, S. H., Kuziak, W. R., Measured Steady Flow Velocity Distributions Around a Valve/Seat Annulus, SAE paper 860462, 1986
  6. El Tahry, S. H., Khalighi, B., Kuziak, W. R., Unsteady-Flow Velocity Measurements Around an Intake Valve of a Reciprocating Engine, SAE paper 870593, 1987
  7. Arcoumanis, C., Vafidis, C., Whitelaw, J. H., Valve and In-Cylinder Flow Generated by a Helical Port in a Production Diesel Engine, J. Fluids Engng, 109 (1987), 4, pp. 368-375
  8. Weclas, M., Melling, A., Durst, F., Flow Separation in the Inlet Valve Gap of Piston Engines, Prog. Energy Combust. Sci., 24 (1998), 3, pp. 165-195
  9. Chen, A., et al., Velocity Characteristics of Steady Flow Through a Straight Generic Inlet Port, Int. J. Numerical Methods in Fluids, 21 (1995), 7, pp. 571-590
  10. Mahmood, Z., et al., On the Structure of Steady Flow through Dual-Intake Engine Ports, Int. J. Numerical Methods in Fluids, 23 (1996), 10, pp. 1085-1109
  11. Nadarajah, S., et al., The Turbulence Structure of the Annular Non-Swirling Flow Past an Axisymmetric Poppet Valve, Proceedings, I.Mech.E, Part C, J. Mech. Engng. Sci., 212 (1998), C6, pp. 455-471
  12. Bensler, H., et al., An Experimental and Numerical Study of the Steady-State Flow of a SI-Engine Intake Port, SAE paper 982470, 1998
  13. Fan, L., Reitz, R. D., Trigui, N., Intake Flow Simulation and Comparison with PTV Measurements, SAE paper 1999-01-0176, 1999
  14. Wagner, T. C., Kent, J. C., Measurement of Intake Valve/Cylinder Boundary Flows Using a Multiple Orientation Hot-Wire Technique, J. Fluids Engng, 110 (1988), 4, pp. 361-366
  15. Vukoslavljević, P. V., Petrović, D. V., Multiple Hot-Wire Probes, Montenegrin Academy of Sciences and Arts, Special editions, Vol. 39, Podgorica, Montenegro, 2000
  16. Bruun, H. H., et al., Calibration and Analysis of X Hot-Wire Probe Signals, Meas. Sci. Technol, 1 (1990), 8, pp. 782-785
  17. Bruun, H. H., et al., Velocity Component Measurements by X Hot-Wire Anemometry, Meas. Sci. Technol, 1 (1990), 12, pp. 1314-1321
  18. Pajković, V. R., Investigation of Flow Processes in I. C. Engine Cylinder Using Multiple Hot-Wire Aneometer Probe (in Serbian), M. Sc. thesis, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia, 2000
  19. Pajković, V. R., Investigation of Flow Processes in I. C. Engine Inlet Port Assembly (in Serbian), Ph. D. thesis, Unive rsity of Montenegro, Faculty of Mechanical Engineering, Podgorica, Montenegro, 2005
  20. Maier, A., Sheldrake, T. H., Wilcock, D., Geometric Parameters Influencing Flow in an Axisymmetric IC Engine Inlet Port Assembly: Part I - Valve Flow Characteristics, J. Fluids Engng, 122 (2000), 4, pp. 650-657

© 2021 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence