Results of experimental investigations of the effects of distortion caused by coil inserts on a turbulent jet are presented. The coils have different wire diameters with constant pitch spacing. The ratios of the coil wire diameter to the tube inside diameter, are 0.06, 0.08, 0.11, 0.13, and 0.16 and the ratio of the pitch spacing to the tube inside diameter, is 1.2. Results show that the coil inserts enhance the mixing process. At the jet-outlet, mixing enhancement is increased when However, further downstream, the highest mixing is achieved for the coil with the largest ratio. Results suggest that the streamwise vortices generated by the coil inserts are the mechanism behind the high entrainments and the mixing process.
Issue Section:
Additional Technical Papers
1.
Bradbury
, L. J. S.
, and Khadem
, A. H.
, 1975
, “The Distortion of a Jet by Tabs
,” J. Fluid Mech.
, 70
, p. 801
801
.2.
Samimy
, M.
, Zaman
, K. B. M. Q.
, and Reeder
, M. F.
, 1993
, “Effect of Tabs at the Nozzle Lip on the Flow and Noise Field of an Axisymmetric Jet
,” AIAA J.
, 31
, p. 609
609
.3.
Zaman
, K. B. M. Q.
, Samimy
, M.
, and Reeder
, M. F.
, 1994
, “Control of an Axisymmetric Jet Using Vortex Generator
,” Phys. Fluids
, 6
(2
), pp. 778
–793
.4.
Bell
, J. H.
, and Mehta
, R. D.
, 1993
, “Effects of Imposed Spanwise Perturbations on Plane Mixing-Layer Structure
,” J. Fluid Mech.
, 257
, pp. 33
–63
.5.
Rose
, W. G.
, 1962
, “A Swirling Round Turbulent Jet
,” ASME J. Appl. Mech.
, 29
, pp. 616
–625
.6.
Lee
, S-L
, 1965
, “Axi-symmetrical Turbulent Swirling Jet
,” ASME J. Appl. Mech.
, 32
, pp. 258
–262
.7.
Chigier
, N. A.
, and Chervinsky
, A.
, 1967
, “Experimental Investigation of Swirling Vortex Motion in Jets
,” ASME J. Appl. Mech.
, 34
, June, pp. 443
–451
.8.
Syred
, N.
, and Beer
, J. M.
, 1974
, “Combustion in Swirling Flows: A Review
,” Combust. Flame
, 23
, pp. 143
–201
.9.
Lilley
, D. G.
, 1997
, “Swirling Flows in Combustion: A Review
,” AIAA J.
, 15
(8
), pp. 1063
–1078
.10.
Sheen, H. J., Chen, W. J., and Jeng, S. Y., 1996, “Recirculation Zones of Unconfined and Confined Annular Swirling Jets,” AIAA J., 34(3).
11.
Talagi
, T.
, and Okamoto
, T.
, 1981
, “Characteristics of Combustion and Pollutant Formation in Swirling Flames
,” Combust. Flame
, 43
, pp. 69
–79
.12.
Gupta, A., Ramavajjala, M., and Taha, M., 1992, “The Effect of Swirl and Nozzle Geometry on the Structure of Flams and Nox Emission,” AIAA Thirteen Aerospace Science Meeting and Exhibit, Reno, NV.
13.
Tangirala
, V.
, and Driscoll
, J. F.
, 1988
, “Temperature Within Non-premixed Flames: Effects of Rapid Mixing Due to Swirl
,” Combust. Sci. Technol.
, 69
, pp. 143
–162
.14.
Ho, W., Yang, S., and Yang, R., 1990, “The Advanced Burner Design Project,” The Fourteen Annual Conference on Theoretical and Applied Mechanics, Chung LI, Taiwan, R.O.C.
15.
Gupta, A. K., Lilley, D. G., and Syred, N., 1984, Swirl Flows, ABACUS Press.
16.
Babikian, D. S., La Rue, J. C., and Rahai, H. R., 1991, “Characteristics of the Velocity Field in the Central Region of a Spirally Fluted Tube,” Paper No. III-3, Proceeding of the Eight Symposium on Turbulent Shear Flows,” Sept. 9–11, Munich, Germany.
17.
Yang, S. R., Zai, G. D., and Kim, R. H., 1990, “Experimental Investigation of a Spiral Turbulator with a Reinforcing Wire as an Augmentator/Cleaner in the Tube Side of Surface Condensers,” Proceedings of CSME Mechanical Engineering Forum 1990, University of Toronto, June 3–9.
18.
Yamplosky, J. S., Libby, P. A., and Launder, B. E., and La Rue, J. C. 1984, “Fluid Mechanics and Heat Transfer of Spiral Fluted Tubing,” GA Technologies Report GA-A17833.
19.
Rahai, H. R., and Wong, T. W., 1998, “Experimental Investigation of Turbulent Jet From Round Ribbed Tubes,” Paper No. FEMSM98-4972, 1998 ASME Fluids Engineering Division Summer Meeting, June 21–25, Washington, DC.
20.
Rahai
, H. R.
, Vu
, H. T.
, and Shojaee Fard
, M. H.
, 2001
, “Mixing Enhancement Using a Coil Insert
,” Appl. Therm. Eng.
, 21
, pp. 303
–309
.Copyright © 2002
by ASME
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