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RESEARCH PAPERS

Flow Measurements in a Model Burner—Part 1

[+] Author and Article Information
D. F. G. Durão, M. V. Heitor, A. L. N. Moreira

Instituto Superior Técnico, Technical University of Lisbon, Department of Mechanical Engineering, 1096 Lisboa, Portugal

J. Fluids Eng 113(4), 668-674 (Dec 01, 1991) (7 pages) doi:10.1115/1.2926532 History: Received August 05, 1987; Online May 23, 2008

Abstract

Laser-Doppler measurements of mean and turbulent velocity characteristics are reported in the developing region of the isothermal flow of a model of an industrial oxy-fuel burner. The burner consists of a central axisymmetric jet surrounded by sixteen circular jets, simulating the injection of oxygen in pratical burners. Errors incurred in the laser-Doppler measurements are estimated and bias effects due to unequal number density of seed particles in the various jet flows are investigated. The experiments have been carried out to investigate the mixing efficiency of the burner assembly without swirl motion and to assess the accuracy of calculation procedures in industrial burners. The results show that the present flow develops faster than related coaxial free jets with the same velocity ratio between central and peripheral air streams due to the comparatively high mixing rate peculiar to the present configuration. The existence of zones characterized by large turbulence anisotropy indicates the need to take account of the normal stresses in any proposed mathematical model to simulate the present flow field.

Copyright © 1991 by The American Society of Mechanical Engineers
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