THERMAL SCIENCE

International Scientific Journal

A SEMI-ANALYTICAL MODEL FOR THE PREDICTION OF THE BEHAVIOR OF TURBULENT COAXIAL GASEOUS JETS

ABSTRACT
In diffusion combustion systems, fuel and oxidizer (usually air) are admitted into the combustion chamber separately in the form of turbulent jets. Most often, fuel enters the furnace from a round nozzle and air is admitted through an annulus surrounding the central fuel nozzle. Momentum of the fuel and air jets is utilized for directing the flame and controlling the mixture formation which is typically the rate-limiting step of the combustion process. Hence the behavior of turbulent coaxial jets must be well understood prior to any detailed analysis of these systems. In this study, a set of relations is proposed to predict the behavior of turbulent coaxial gaseous jets using curve-fits to the computational fluid dynamics (CFD) solutions and the fluid flow governing equations as well as the ideal gas equation of state. A computer program is developed to implement the presented model. Results are compared with existing data and reasonable agreement is observed. According to the results, the presented model makes sufficiently accurate estimates of the flow and concentration fields in a very short time.
KEYWORDS
PAPER SUBMITTED: 2011-07-01
PAPER REVISED: 2012-07-04
PAPER ACCEPTED: 2012-07-11
DOI REFERENCE: https://doi.org/10.2298/TSCI110701140L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2013, VOLUME 17, ISSUE Issue 4, PAGES [1221 - 1232]
REFERENCES
  1. Forstall, W., Shapiro, A. H., Momentum and Mass Transfer in Coaxial Gas Jets, Journal of Applied Mechanics, 18 (1950), pp. 399-408
  2. Morton, B. R., Coaxial Turbulent Jets, International Journal of Heat and Mass Transfer, 5 (1962), pp. 955-965
  3. Chigier, N. A., Beer, J. M., The Flow Region Near the Nozzle in Double Concentric Jets, Journal of Basic Engineering, 86 (1964), pp. 797-804
  4. Williams, T. J., Ali, M. R. M. H., Anderson, J. S., Noise and Flow Characteristics of Coaxial Jets, Journal of Mechanical Engineering Science, 11 (1969), pp. 133-142
  5. Champagne, F. H., Wygnanski, I. J., An Experimental Investigation of Coaxial Turbulent Jets, International Journal of Heat and Mass Transfer, 14 (1971), pp. 1445-1464
  6. Ribeiro, M. M., Whitelaw, J. H., Turbulent Mixing of Coaxial Jets with Particular Reference to the Near-exit Region, Journal of Fluids Engineering-Transactions of the ASME, 98 (1976), pp. 284-291
  7. Ko, N. W. M., Kwan, A. S. H., The Initial Region of Subsonic Coaxial Jets, Journal of Fluid Mechanics, 73 (1976), pp. 305-332
  8. Dahm, W. J. A., Frieler, C. E., Tryggvason, G., Vortex Structure and Dynamics in the Near Field of a Coaxial Jet, Journal of Fluid Mechanics, 241 (1992), pp. 371-402
  9. Buresti, G., Petagna, P., Talamelli, A., Experimental Investigation on the Turbulent Near-field of Coaxial Jets, Experimental Thermal and Fluid Science, 17 (1998), pp. 18-36
  10. Warda, H. A., et al., Influence of the Magnitude of the Two Initial Velocities on the Flow Field of a Coaxial Turbulent Jet, Flow Measurement and Instrumentation, 12 (2001), pp. 29-35
  11. Schumaker, S. A., An Experimental Investigation of Reacting and Nonreacting Coaxial Jet Mixing in a Laboratory Rocket Engine, Ph.D., Thesis, University of Michigan, Michigan, USA, 2009
  12. Enjalbert, N., Galley, D., Pierrot, L., An Entrainment Model for the Turbulent Jet in a Coflow, Comptes Rendus Mecanique, 337 (2009), pp. 639-644
  13. Antoine, Y., Lemoine, F., Lebouche, M., Turbulent Transport of a Passive Scalar in a Round Jet Discharging into a Co-flowing Stream, European Journal of Mechanics B-Fluids, 20 (2001), pp. 275-301
  14. Belosevic, S., et al., Three-dimensional Modeling of Utility Boiler Pulverized Coal Tangentially Fired Furnace, International Journal of Heat and Mass Transfer, 49 (2006), pp. 3371-3378
  15. Kandakure, M. T., Patkar, V. C., Patwardhan, A. W., Characteristics of Turbulent Confined Jets, Chemical Engineering and Processing, 47 (2008), pp. 1234-1245
  16. Beer, J. M., Chigier, N. A., Combustion Aerodynamics, Applied Science Publishers, London, 1972
  17. Birch, A. D., et al., The Turbulent Concentration Field of a Methane Jet, Journal of Fluid Mechanics, 88 (1978), pp. 431-449
  18. Shih, T. H., et al., A New k-e Eddy-Viscosity Model for High Reynolds Number Turbulent Flows: Model Development and Validation, Computers & Fluids, 24 (1995), 3, pp. 227-238
  19. ***, Fluent 6.2 User's Guide, Fluent Inc., Lebanon, NH 03766, USA, 2005
  20. Khalilarya, Sh., Pormahmod, N., Lotfiani, A., Evaluation of Two-equation Turbulence Models for the Simulation of Gaseous Round Jets (in Farsi), Proceedings, 2009 Mechanical Engineering Conference, Mashhad, Iran, October 2009, p. 210
  21. Khalilarya, Sh., Lotfiani, A., Determination of Flow Pattern and its Effect on NOx Emission in a Tangentially Fired Single Chamber Square Furnace, Thermal Science, 14 (2010), pp. 493-503

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, 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