Hostname: page-component-7b7567c8c-wxvwp Total loading time: 0 Render date: 2026-11-15T16:05:09.703Z Has data issue: false hasContentIssue false
  • English
  • Français

Improving Combustion Intensity and Modulating Flame Behaviors Using Helical-Grooved Cones

Published online by Cambridge University Press:  20 December 2012

S. C. Yen and
C. L. Shih
S. C. Yen*
Affiliation:
Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Keelung, Taiwan 20224, R.O.C.
C. L. Shih
Affiliation:
Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Keelung, Taiwan 20224, R.O.C.
*
*Corresponding author (, scyen@mail.ntou.edu.tw)

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the 'Save PDF' action button.

Four helical-grooved cones were installed behind an unconfined combustion nozzle to increase the bluff-body effect and turbulence intensity (T.I.). The cone configurations included a smooth cone and the other three cones cut with 1, 2 and 3 helical v-grooves. Experimental results showed that the helical v-grooves transformed the axial momentum (or the axial velocity) to the angular momentum (or the angular velocity). The T.I. was enhanced by increasing the tangential component of fuel-jet momentum. The direct photography and thermocouple were utilized to observe the flame structures and to delineate the characteristic flame modes, flame length, temperature distribution, and combustion intensity. The flame modes were classified as jet flame, flickering flame, bubble flame, recirculation flame, lifted flame and ring flame. The flame length decreases as the groove number increases. The increased T.I. and groove number (or bluff-body effect) improve the fuel-air mixing. The total combustion intensity increases with annular-air jet and with the groove number.

Keywords

Helical-grooved coneFlame lengthCombustion intensity

Information

Type
Articles
Information
Journal of Mechanics , Volume 29 , Issue 2 , June 2013, pp. 273 - 280
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2013

References

REFERENCES

1.Rose, W. G., “A Swirling Round Turbulent Jet 1-Mean-flow Measurements,” Journal of Applied Mechanics, 29, pp. 615–625 (1962).Google Scholar
2.Chigier, N. A. and Beer, J. M., “Velocity and Static Pressure Distributions in Swirling Air Jets Issuing from Annular and Divergent Nozzles,” Journal of Fluids Engineering, ASME, 86, pp. 788–798 (1964).Google Scholar
3.Davies, T. W. and Beer, J. M., “Flow in the Wake of Bluff-body Flame Stabilizers,” Proceedings Twentieth Symposium (International) on Combustion, The Combustion Institute, pp. 631–638 (1971).Google Scholar
4.Gupta, A. K., Lilley, D. G. and Syred, N., Swirl Flow, Abacus Press, Cambridge, pp. 1–293 (1984).Google Scholar
5.Li, X. and Takin, R. S., “A Study of Cold and Combusting Flow around Bluff-body Combustors,” Combustion Science and Technology, 52, pp. 173–206 (1987).Google Scholar
6.Winterfeld, G., “On Process of Turbulent Exchange Behind Flame Holders,” Tenth Symposium (International) on Combustion, The Combustion Institute, pp. 1265–1273 (1965).Google Scholar
7.Calvert, J. R., “Experiments on the Low-speed Flow Past Cones,” Journal of Applied Mechanics, 27, pp. 273–289 (1967).Google Scholar
8.Taylor, M. K. P. and Whitelaw, J. H., “Velocity Characteristics in the Turbulent Near Wakes of Confined Axisymmetric Bluff Bodies,” Journal of Applied Mechanics, 139, pp. 391–416 (1984).Google Scholar
9.Marsri, A. R. and Bilger, R. W., “Turbulent Diffusion Flame of Hydrocarbon Fuel Stabilized on a Bluff Body,” Proceedings Twentieth Symposium (International) on Combustion, The Combustion Institute, pp. 319–326 (1984).Google Scholar
10.Schefer, R. W., Namazian, M. and Kelly, J., “Velocity Measurement in Turbulent Bluff-body Stabilized Flows,” AIAA Journal, 32, pp. 1844–1851 (1994).Google Scholar
11.Roquemore, W. M., Tankin, R. S., Chiu, H. H. and Lottes, S. A., “A Study of a Bluff-body Combustor Using Laser Sheet Lighting,” Experiments in Fluids, 4, pp. 205–213 (1986).Google Scholar
12.Huang, R. F. and Lin, C. L., “Characteristic Modes and Thermal Structure of Nonpremixed Circular-Disc Stabilized Flames,” Combustion Science and Technology, 100, pp. 123–139 (1994).Google Scholar
13.Loitsyanskii, L. G., “The Propagation of a Twisted Jet in an Unbounded Space Filed with the Same Fluid,” Prikladnaya Matematica I Mekhanika, 17, pp. 3–6 (1953).Google Scholar
14.Gortler, H., “Decay of Swirl in an Axially Symmetrical Jet far from the Orifice,” Revista Matematica Hispano American, Series 4, 14, pp. 143–178 (1954).Google Scholar
15.Hartnett, J. P. and Eckert, E. R. G., “Experiment Study of the Velocity and Temperature Distribution in a high Velocity Vortex Type Flow,” Journal of Fluids Engineering, Transactions of the ASME, Series D, 79, pp. 751–757 (1957).Google Scholar
16.Lay, J. E., “An Experiment and Analytical Study of the Vortex-flow Temperature Separation by Position of Spiral and Axial Flows,” Journal of Fluids Engineering, Transactions of the ASME, Series D, 81, pp. 202–212 (1959).CrossRefGoogle Scholar
17.Chigier, N. A. and Chervinsky, A., “Experimental Investigation of Swirling Vortex Motions in Jets,” Journal of Applied Mechanics, 89, pp. 443–451 (1967).Google Scholar
18.Kerr, N. M. and Fraser, D., “Swirl Part 1: Effect on Axisymmetrical Turbulent Jets,” Journal of Institute Fuel, 38, pp. 519–526 (1965).Google Scholar
19.Cheng, T. S., Chao, Y. C., Wu, D. C., Yuan, T., Lu, C. C., Cheng, C. K. and Chang, J. M., “Effects of Fuel-air Mixing on Flame Structures and NOx Emissions in Swirling Methane Jet Flames,” Proceedings Twenty-Seventh Symposium (International) on Combustion, The Combustion Institute, pp. 1229–1237 (1998).Google Scholar
20.Chervinsky, A., “Turbulent Swirling Jet Diffusion Flames,” AIAA Journal, 7, pp. 1877–1883 (1969).Google Scholar
21.Chen, R. H., Driscoll, J. F., Kelly, J., Namazian, M. and Schefer, R. W., “A Comparison of Bluff-body and Swirl-stabilized Flame,” Combustion Science and Technology, 71, pp. 197–217 (1990).Google Scholar
22.San, K. C. and Hsu, H. J., “Characteristics of Flow and Flame Behavior behind Rifled/Unrifled Nozzles,” Journal of Engineering for Gas Turbines and Power, 131, p. 051501 (2009).Google Scholar
23.Chung, S. H. and Lee, B. J., “On the Characteristics of Laminar Lifted Flames in a Nonpremixed Jet,” Combustion and Flame, 86, pp. 62–72 (1991).Google Scholar
24.Lee, K. M., Kim, T. K., Kim, W. J., Kim, S. G., Park, J. and Keel, S. I., “A Visual Study on Flame Behavior in Tone-Excited Non-Premixed Jet Flames,” Fuel, 81, pp. 2249–2255 (2002).Google Scholar
25.Huang, R. F. and Yen, S. C., “Aerodynamic Characteristics and Thermal Structure of Nonpremixed Reacting Swirling Wakes at Low Reynolds Numbers,” Combustion and Flame, 155, pp. 539–556 (2008).CrossRefGoogle Scholar
26.Yen, S. C., “Flow Control and Flame Manipulation of Swirling Jets Using a Dual- Disc Blockage Configuration,” Ph.D. Dissertation, National Taiwan University of Science and Technology, Taipei, Taiwan, pp. 63–65 (2003).Google Scholar
27.Cengel, Y. A. and Boles, M. A., Thermodynamics: An Engineering Approach, Third Edition, McGraw-Hill, p. 901 (1998).Google Scholar