Short annular diffusers with negative wall angles were evaluated numerically and experimentally with up to 40 deg inlet swirl at an inlet Reynolds number of Ret ≈ 1.4 × 105 and Mach number of Mt ≈ 0.16. The 80% experimental effectiveness of the 1.61 and 1.91 area ratio (AR) diffusers with 0–20 deg inlet swirl were on par with unswirled maximums reported in literature and computational fluid dynamics (CFD) predicted reasonable outlet axial velocity profiles and wall pressure distributions. The AR = 2.73 diffuser's effectiveness without swirl was 13% below the maximum for the given AR and larger discrepancies occurred in the CFD results due to the incorrect prediction of the recirculation zone strength. Preference was given to the realizable k–ε model on coarse grids with wall functions that predicted performance of all cases with at least 20 deg inlet swirl to within 20%.
Issue Section:
Gas Turbines: Turbomachinery
References
1.
Sovran
, G.
, and Klomp
, E. D.
, 1967
, “Experimentally Determined Optimum Geometries for Rectilinear Diffusers With Rectangular, Conical, or Annular Cross-Section
,” Fluid Dynamics of Internal Flow
, Elsevier
, New York, pp. 270
–319
.2.
Johnston
, I. H.
, 1953
, “The Effect of Inlet Conditions on the Flow in Annular Diffusers
,” National Gas Turbine Establishment, Fleet, UK, Memorandum No. M.167.3.
Stevens
, S. J.
, 1967
, “The Performance of Annular Diffusers
,” Proc. Inst. Mech. Eng.
, 182
(4), pp. 58–70.10.1243/PIME_CONF_1967_182_130_024.
Howard
, J.
, Thornton-Trump
, A.
, and Henseler
, H.
, 1967
, “Performance and Flow Regimes for Annular Diffusers
,” ASME
Paper No. 67-WA/FE-21.5.
Japikse
, D.
, and Baines
, N. C.
, 1998
, Diffuser Design Technology
, Concepts ETI
, White River Junction, VT.6.
Mallett
, W. E.
, and Harp
, J. L.
, Jr., 1954
, “Performance Characteristics of Several Short Annular Diffusers for Turbojet Engine Afterburners
,” National Advisory Committe for Aeronautics, Washington, DC, Report No. NACA RM E54B09.7.
Wood
, C. C.
, and Higginbotham
, J. T.
, 1954
, “Effects of Diffuser and Center-Body Length on the Performance of Annular Diffusers With Constant Diameter Outer Walls and With Vortex Generator Flow Controls
,” National Advisory Committe for Aeronautics, Washington, DC, Report No. NACA RM L54G21.8.
Eckert
, W. T.
, Johnston
, J. P.
, Simons
, T. D.
, Mort
, K. W.
, and Page
, V. R.
, 1980
, “An Experimental Investigation of Two Large Annular Diffusers With Swirling and Distorted Flow
,” Ames Research Center, Mountain View, CA, Technical Report No. 79-40, NASA Technical Paper No. 1628.9.
Adkins
, R.
, Jacobsen
, O.
, and Chevalier
, P.
, 1986
, “A Preliminary Study of Annular Diffusers With Constant Diameter Outer Walls (Suitable for Turbine Exits)
,” Int. J. Turbo Jet Eng.
, 3
(2–3), pp. 181
–190
.10.
Thayer
, E. B.
, 1971
, Evaluation of Curved-Wall Annular Diffusers
, ASME Paper No. 71-WA.11.
Jirásek
, A.
, 2006
, “Design of Vortex Generator Flow Control in Inlets
,” J. Aircr.
, 43
(6
), pp. 1886
–1892
.10.2514/1.2136412.
Wendt
, B. J.
, 2004
, “Parametric Study of Vortices Shed From Airfoil Vortex Generators
,” AIAA J.
, 42
(11
), pp. 2185
–2195
.10.2514/1.367213.
Birk
, A. M.
, and Davis
, W. R.
, 1989
, “Suppressing the Infra-Red Signatures of Marine Gas Turbines
,” ASME J. Eng. Gas Turbines Power
, 111
(1
), pp. 123
–129
.10.1115/1.324021014.
Bosioc
, A.
, Tanasa
, C.
, Muntean
, S.
, and Susan-Resiga
, R.
, 2010
, “Unsteady Pressure Measurements and Numerical Investigation of the Jet Control Method in a Conical Diffuser With Swirling Flow
,” IOP Conf. Ser.: Earth Environ. Sci.
, 12
(1
), p. 012017
.10.1088/1755-1315/12/1/01201715.
Stevens
, S. J.
, and Fry
, P.
, 1973
, “Measurements of the Boundary-Layer Growth in Annular Diffusers
,” J. Aircr.
, 10
(2
), pp. 73
–80
.10.2514/3.6019916.
Japikse
, D.
, and Pampreen
, R.
, 1979
, “Annular Diffuser Performance for an Automotive Gas Turbine
,” ASME J. Eng. Gas Turbines Power
, 101
(3), pp. 358
–371
.10.1115/1.344658417.
Senoo
, Y.
, and Kawaguchi
, N.
, 1987
, “Pressure Recovery of Collectors With Annular Curved Diffusers
,” Int J. Turbo Jet Eng.
, 4
(3–4), pp. 181
–190
.18.
Dominy
, R. G.
, Kirkham
, D. A.
, and Smith
, A. D.
, 1998
, “Flow Development Through Interturbine Diffusers
,” ASME J. Turbomach.
, 120
(2), pp. 298
–304
.10.1115/1.284140619.
Lohmann
, R. P.
, Markowski
, S. J.
, and Brookman
, E. T.
, 1979
, “Swirling Flow Through Annular Diffusers With Conical Walls
,” ASME J. Fluids Eng.
, 101
(2), pp. 224
–229
.10.1115/1.344893920.
Dovzhik
, S. A.
, and Kartavenko
, V. N.
, 1975
, “Measurement of the Effect of Flow Swirl on the Efficiency of Annular Ducts and Exhaust Nozzles of Axial Turbomachines
,” Fluid Mech. Sov. Res.
, 4
(4
), pp. 156
–172
.21.
Fleige
, H.
, Riess
, W.
, and Seume
, J.
, 2002
, Swirl and Tip Leakage Flow Interaction With Struts in Axial Diffusers
, ASME
Paper No. GT-2002-30491.10.1115/GT-2002-3049122.
Coladipietro
, R.
, Schneider
, J. H.
, and Sridhar
, K.
, 1975
, “Effects of Inlet Flow Conditions on the Performance of Equiangular Annular Diffusers
,” Trans. CSME
, 3
(2
), pp. 75
–82
.23.
Klomp
, E. D.
, 1997
, “Performance of Straight-Walled Annular Diffusers With Swirling Flow
,” Aeronaut. J.
, 101
(1010
), pp. 467
–480
.24.
Gupta
, A. K.
, Lilley
, D. G.
, and Syred
, N.
, 1984
, Swirl Flows
, ABACUS Press
, Tunbridge Wells, Kent, UK.25.
Lilley
, D. G.
, 1999
, “Annular Vane Swirler Performance
,” J. Propul. Power
, 15
(2
), pp. 248
–252
.10.2514/2.541926.
Cerantola
, D. J.
, and Birk
, A. M.
, 2012
, “Numerically Optimizing an Annular Diffuser Using a Genetic Algorithm With Three Objectives
,” ASME
Paper No. GT2012-68205.10.1115/GT2012-6820527.
Cerantola
, D. J.
, 2014
, “Evaluation of Swirl and Tabs in Short Annular Diffusers
,” Ph.D. thesis, Queen's University, Kingston, ON, Canada.28.
Adams
, D. W.
, 2013
, “Improvements on Single Point Incremental Forming Through Electrically Assisted Forming, Contact Area Prediction and Tool Development
,” Ph.D. thesis, Queen's University, Kingston, ON, Canada.29.
Gallington
, R. W.
, 1980
, “Measurement of Very Large Flow Angles With Non-Nulling Seven-Hole Probes
,” Aeronautics Digest, Spring-Summer, pp. 60
–88
, Paper No. USAFA-TR-80-17.30.
Crawford
, J.
, and Birk
, A. M.
, 2013
, “Improvements to Common Data Reduction and Calibration Methods for Seven Hole Probes
,” ASME J. Fluids Eng.
, 135
(3), p. 031206
.10.1115/1.402364931.
Crawford
, J.
, and Birk
, A. M.
, 2013
, “Influence of Tip Shape on Reynolds Number Sensitivity for a Seven Hole Pressure Probe
,” ASME J. Eng. Gas Turbines Power
, 135
(9
), p. 091602
.10.1115/1.402495032.
ANSYS Inc.,
2013
, ANSYS® Release 15.0: ANSYS FLUENT User's Guide, ANSYS Inc., Canonsburg, PA.33.
Shih
, T.-H.
, Liou
, W. W.
, Shabbir
, A.
, Yang
, Z.
, and Zhu
, J.
, 1995
, “A New k-ε Eddy Viscosity Model for High Reynolds Number Turbulent Flows
,” Comput. Fluids
, 24
(3
), pp. 227
–238
.10.1016/0045-7930(94)00032-T34.
Menter
, F
., 1994
, “Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications
,” AIAA J.
, 32
(8
), pp. 1598
–1605
.10.2514/3.1214935.
Roache
, P. J.
, 1998
, “Verification of Codes and Calculations
,” AIAA J.
, 36
(5
), pp. 696
–702
.10.2514/2.45736.
Freitas
, C.
, Ghia
, U.
, Celik
, I.
, Roache
, P.
, and Raad
, P.
, 2003
, “ASME's Quest to Quantify Numerical Uncertainty
,” AIAA
Paper No. 2003–627.10.2514/6.2003–62737.
White
, F. M.
, 2006
, Viscous Fluid Flow
, 3rd ed., McGraw-Hill
, New York.Copyright © 2015 by ASME
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