This paper reports on the experimental investigation of the flow inside a low aspect ratio (length less than the reattachment length of separated flow) dump combustor with a tapered exit. The flow field in the combustor is evaluated using wall pressure and velocity measurements at varying flow Reynolds numbers. The mean velocity and turbulence variation closer to the wall of the combustor was found to be different from that at other radial locations due to the presence of recirculation and possible thickening of the shear layer caused by a decrease in the strength of the potential core. The power spectral study of the wall pressure and velocity fluctuations suggested the dominant presence of acoustic perturbations with amplitude modulation of such perturbations due to viscous dissipation in the shear layer.
Issue Section:
Technical Briefs
References
1.
Robinson
, S. K.
, 1991
, “Coherent Motions in the Turbulent Boundary Layer
,” Ann. Rev. Fluid Mech.
, 23
, pp. 601
–639
.10.1146/annurev.fl.23.010191.0031252.
Schadow
, K. C.
, Gutmark
, E.
, and Wilson
, K. J.
, 1992
, “Active Combustion Control in a Coaxial Dump Combustor
,” Comb. Sci. Technol.
, 81
, pp. 285
–300
.10.1080/001022092089518073.
Rhode
, D. L.
, Lilley
, D. G.
, and McLaughlin
, D. K.
, 1983
, “Mean Flow Fields in Axisymmetric Combustor Geometries With Swirl
,” AIAA J.
, 21
(4
), pp. 593
–600
.10.2514/3.601274.
Escudier
, M. P.
, and Keller
, J. J.
, 1985
, “Recirculation in Swirling Flow: Manifestation of Vortex Breakdown
,” AIAA J.
, 23
(1
), pp. 111
–116
.10.2514/3.88785.
Joos
, F.
, and Vortmeyer
, D.
, 1986
, “Self-Excited Oscillations in Combustion Chambers With Premixed Flames and Several Frequencies
,” Combust. Flame
, 65
, pp. 253
–262
.10.1016/0010-2180(86)90039-86.
Schadow
, K. C.
, Wilson
, K. J.
, and Gutmark
, E.
, 1987
, “Characterization of Large-Scale Structures in a Forced Ducted Flow With Dump
,” AIAA J.
, 25
(9
), pp. 1164
–1170
.10.2514/3.97637.
Yu
, K.
, Wilson
, K. J.
, Parr
, T. P.
, Smith
, R. A.
, and Schadow
, K. C.
, 1996
, “Characterization of Pulsating Spray Droplets and Their Interaction With Vortical Structures
,” AIAA Paper No. 96-0083.8.
Schadow
, K. C.
, Yu
, K.
, Parr
, T. P.
, and Wilson
, K. J.
, 1997
, “Active Combustion Control With Pulsed Fuel Injection
,” ISABE Paper No. 97-7153.9.
Drewry
, J. E.
, 1978
, “Fluid Dynamic Characterization of Sudden-Expansion Ramjet Combustor Flowfields
,” AIAA J.
, 16
(4
), pp. 313
–319
.10.2514/3.6089410.
Viets
, H.
, and Drewry
, J. E.
, 1981
, “Quantitative Prediction of Dump Combustor Flowfields
,” AIAA J.
, 19
(4
), pp. 484
–491
.10.2514/3.785711.
Yang
, B. T.
, and Yu
, M. H.
, 1983
, “The Flow Field in a Suddenly Enlarged Combustion Chamber
,” AIAA J.
, 21
(1
), pp. 92
–97
.10.2514/3.803312.
Usui
, H.
, and Sano
, Y.
, 1989
, “Recirculating Flow in a Confined Space With Axisymmetric Sudden Expansion Followed by Conical Contraction
,” J. Chem. Eng. Jpn.
, 22
(1
), pp. 1
–5
.10.1252/jcej.22.113.
Farabee
, T. M.
, and Casarella
, M. J.
, 1991
, “Spectral Features of Wall Pressure Fluctuations Beneath Turbulent Boundary Layers
,” Phys. Fluids
, 3
(10)
, pp. 2410
–2420
.10.1063/1.85817914.
Simpson
, R. L.
, Ghodbane
, M.
, and McGrath
, B. E.
, 1987
, “Surface Pressure Fluctuations in a Separating Boundary Layer
,” J. Fluid Mech.
, 177
, pp. 167
–186
.10.1017/S002211208700090915.
Bull
, M. K.
, 1996
, “Wall Pressure Fluctuations Beneath Turbulent Boundary Layers: Some Reflections on Forty Years of Research
,” J. Sound Vib.
, 190
(3
), pp. 299
–315
.10.1006/jsvi.1996.006616.
Menon
, S.
, and Wen
, H. J.
, 1990
, “Numerical Simulation of Oscillatory Cold Flows in an Axisymmetric Ramjet Combustor
,” J. Propul. Power
, 6
(5
), pp. 525
–534
.10.2514/3.2325217.
McManus
, K. R.
, Vandsburger
, U.
, and Bowman
, C. T.
, 1990
, “Combustor Performance Enhancement Through Direct Shear Layer Excitation
,” Combust. Flame
, 82
, pp. 75
–92
.10.1016/0010-2180(90)90079-718.
Schadow
, K. C.
, Wilson
, K. J.
, and Gutmark
, E.
, 1987
, “Characterization of Large-Scale Structures in a Forced Flow With Dump
,” AIAA J.
, 25
(9
), pp. 1164
–1170
.10.2514/3.976319.
Gutmark
, E.
, and Ho
, C. M.
, 1983
, “Preferred Modes and the Spreading Rate of the Jets
,” Phys. Fluids
, 26
(10
), pp. 2932
–2938
.10.1063/1.86405820.
Nigam
, S.
, Ahmed
, D.
, and Kushari
, A.
, 2009
, “Macroscopic Flow Behavior in a Low Aspect Ratio Dump Combustor With Tapered Exit
,” Int. J. Turbo Jet Engines
, 26
(1
), pp. 19
–31
.10.1515/TJJ.2009.26.1.1921.
Yadav
, N. P.
, and Kushari
, A.
, 2009
, “Vortex Combustion in Low Aspect Ratio Dump Combustor With Tapered Exit
,” Energy Convers. Manage.
, 50
(12
), pp. 2983
–2991
.10.1016/j.enconman.2009.07.01722.
Yadav
, N. P.
, and Kushari
, A.
, 2010
, “Effect of Swirl on Turbulent Behaviour of a Dump Combustor Flow
,” Proc. IMechE Part G: J. Aerosp. Eng.
, 224
(6
), pp. 705
–717
.10.1243/09544100JAERO62723.
Moffat
, R. J.
, 1988
, “Describing the Uncertainties in the Experimental Results
,” Exp. Therm. Fluid Sci.
, 1
, pp. 3
–17
.10.1016/0894-1777(88)90043-X24.
Tran
, N.
, Ducruix
, S.
, and Schuller
, T.
, 2009
, “Damping Combustion Instabilities With Perforates at the Premixer Inlet of a Swirled Burner
,” Proc. Combust. Inst.
, 32
(2
), pp. 2917
–2924
.10.1016/j.proci.2008.06.123Copyright © 2013 by ASME
You do not currently have access to this content.
