Browse > Article

Effects of a Swirling and Recirculating Flow on the Combustion Characteristics in Non- Premixed Flat Flames  

Jeong, Yong-Ki (School of Mechanical Engineering, Pusan National University)
Jeon, Chung-Hwan (Research Institute of Mechanical Technology)
Chang, Young-June (School of Mechanical Engineering, Pusan National University)
Publication Information
Journal of Mechanical Science and Technology / v.18, no.3, 2004 , pp. 499-512 More about this Journal
Abstract
The effects of swirl intensity on non-reacting and reacting flow characteristics in a flat flame burner (FFB) with four types of swirlers were investigated. Experiments using the PIV method were conducted for several flow conditions with four swirl numbers of 0, 0.26, 0.6 and 1.24 in non-reacting flow. The results show that the strong swirling flow causes a recirculation, which has the toroidal structures, and spreads above the burner exit plane. Reacting flow characteristics such as temperature and the NO concentrations were also investigated in comparison with non-reacting flow characteristics. The mean flame temperature was measured as the function of radial distance, and the results show that the strong swirl intensity causes the mean temperature distributions to be uniform. However the mean temperature distributions at the swirl number of 0 show the typical distribution of long flames. NO concentration measurements show that the central toroidal recirculation zone caused by the strong swirl intensity results in much greater reduction in NO emissions, compared to the non-swirl condition. For classification into the flame structure interiorly, the turbulence Reynolds number and the Damkohler number have been examined at each condition. The interrelation between reacting and non-reacting flows shows that flame structures with swirl intensity belong to a wrinkled laminar-flame regime.
Keywords
CTRZ (Central Toroidal Recirculation Zone); Damkohler Number; FFB (Flat Flame Burner); PIV (Particle Image Velocimetry); Swirl; and Turbulence Reynolds Number;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Buckley, P. L., Craig, R. R., Davis, D. L. and Schwartzkopf, K. G., 1983, 'The Design and Combustion Performance of Practical Swirless for Integral Rocket/Ramjets,' AIAA, 21(5), pp. 740-743
2 Chang, T. P., 1985, 'Image Processing of Tracer Particle Motion as Applied to Mixing and Turbulent Flow,' Chemical Engineering Science, Vol. 40, No. 2
3 Chaturvedi, M. C., 1963, 'Flow Characteristics of Axisymmetric Expansion,' Proceedings J. of the Hydraulics Division, ASCE, Vol. 89, No. HY3, pp. 61-92
4 Chiger, N. A. and Yule, A. J., 'The Physical Structure of Turbulent Flame,' AIAA 1979-0217, pp. 1-8
5 Choi, G. M. and Katsuki, M., 2001, 'Advanced low Nox Combustion Using Highly Preheated Air,' Energy conversion and Management, Vol. 42, pp. 639-652   DOI   ScienceOn
6 Gupta, A. K., Lilley, D. G. and Syred, N., 1984, Swirl Flows, Abacus Press, Turnbridge wells
7 Lee, S. G., Song, K. K. and Rho, B. J., 2002, 'Investigation of Turbulent Spray Disintegration Characteristics Depending on the Nozzle Configuration,' KSME (Int.), Vol. 16, No. 4, pp. 572-579
8 Hall, M. G., 1972, 'Vortex Breakdown,' Annual review of Fluid Mechanics 4, pp. 195-218   DOI   ScienceOn
9 Lee, S. J., 1999, PIV-Velocity Field Measurement, POSTECH
10 Lefebvre, A. H., 1983, Gas Turbine Combusion, Hemishere, Washington, DC
11 Hoffmann, S., Lenze, B. and Eickhoff, H., 1998, 'Results of Experiments and Models for Predicting Stability Limits of Turbulent Swirling Flames,' Journal of Engineering for Gas Turbines and Power, Transactions of the ASME, Vol. 120, No. 2, pp. 311-316   DOI   ScienceOn
12 Mathur, M. L. and Maccallum, N. R. L., 1976, 'Swirling Air Tests Issuing from Vane Swirlers,' J. of the Institute of Fuel, Vol. 41, pp. 238-240
13 Ralph, A., Dalla, B. and Thomas, R. N., 1999, 'Application of Catalytic Combustion to a 1.5 MW Industrial Gas Turbine,' Catalysis Today, Vol. 47, Issues 1-4, pp. 369-375   DOI   ScienceOn
14 Lee, S. N., Yoon, H. K. and Ryu, J. I., 1996, 'Flow Field Characteristics of a High Load Combustor,' KSME, pp. 58-63
15 Ryan, B. W. and John, K. E., 2001, 'Structure of a Swirling, Recircilating Coaxial Free Jet and Its Effect on Particle Motion,' Int. J. Multiphase Flow 27, pp. 949-970   DOI   ScienceOn
16 Armstrong, N. W. H. and Bray, K. N. C., 1992, 'Premixed Turbulent Combustion Flow-field Measurement Using PIV and LST and Their Application to Flamelet Modeling of Engine Combustion,' SAE, No. 922322
17 Saad, A. A. 1998, 'Velocity Mesurements and Turbulence Statistics of a Confined Isothermal Swirling Flow,' Experimental Thermal and Fluid Science, Vol. 17, pp. 256-264   DOI   ScienceOn
18 Stephan, E. S. and Paul, O. H., 1995, 'CARS Temperature and LDA Velocity Measurements in a Turbulent, Swirling, Premixed Propane/Air Fueled Model Gas Turbine Combustor,' ASME 95-GT-64
19 Turns, S. R., 2000, An Introduction to Combustion Concepts and Applications, McGRAW-HILL
20 Yegian, D. T. and Cheng, R. K., 1998, 'Developement of a Lean Premixed Low-Swirl Burner for Low NOx Practical Applications,' Com. Sci. and Tech., Vol. 139, No. 1, pp. 207-238   DOI
21 Adrian R. J., 1991, 'Particle Imaging Techniques for Experimental Fluid Mechanics.' Annu. Rev. Fluid Mech., Vol. 23, pp. 201-304   DOI   ScienceOn