Actuator-disk models (ADMs) use blade element theory to numerically simulate the flow field induced by axial fans. These models give a fair approximation at near design flow rates, but are of poor accuracy at low flow rates. Therefore, the lift/drag (LD) characteristics of two-dimensional (2D) sections along the span of an air-cooled heat exchanger (ACHE) axial fan are numerically investigated, with the future prospect of improving ADMs at these flow conditions. It is found that the blade sectional LD characteristics are similar in shape, but offset from the 2D LD characteristics of the reference airfoil (NASA LS 413 profile) at small angles of attack (). A deviation between these characteristics is observed at higher angles of attack. The blade sectional lift coefficients for always remain lower compared to the maximum lift coefficient of the reference airfoil. Conversely, the blade sectional drag coefficients are always higher compared to that of the reference airfoil for .
Issue Section:
Flows in Complex Systems
Keywords:
Aerodynamics ,
Computational fluid dynamics,
Drag,
Lift,
Pumps ,
RANS simulations,
Rotating fluids,
Turbomachines
References
1.
Owen
, M. T. F.
, 2010
, “A Numerical Investigation of Air-Cooled Steam Condenser Performance Under Windy Conditions
,” Masters thesis, University of Stellenbosch, Stellenbosch, Republic of South Africa.2.
Gao
, X. F.
, Zhang
, C. W.
, Wei
, J. J.
, and Yu
, B.
, 2010
, “Performance Prediction of an Improved Air-Cooled Steam Condenser With Deflector Under Strong Wind
,” Appl. Therm. Eng.
, 30
(17–18
), pp. 2663
–2669
.10.1016/j.applthermaleng.2010.07.0153.
Yang
, L.
, Du
, X.
, and Yang
, Y.
, 2012
, “Wind Effect on the Thermo-Flow Performances and Its Decay Characteristics for Air-Cooled Condensers in a Power Plant
,” Int. J. Therm. Sci.
, 53
, pp. 175
–187
.10.1016/j.ijthermalsci.2011.10.0214.
Corsini
, A.
, and Rispoli
, F.
, 2004
, “Using Sweep to Extend the Stall-Free Operational Range in Axial Fan Rotors
,” Proc. Inst. Mech. Eng. Part A J. Power Energy
, 218
(3
), pp. 129
–139
.10.1243/0957650043230498695.
Vad
, J.
, Kwedikha
, A. R. A.
, and Jaberg
, H.
, 2006
, “Effects of Blade Sweep on the Performance Characteristics of Axial Flow Turbomachinery Rotors
,” Proc. Inst. Mech. Eng. Part A J. Power Energy
, 220
(7
), pp. 737
–749
.10.1243/09576509JPE2496.
Corsini
, A.
, Delibra
, G.
, and Sheard
, A. G.
, 2013
, “On the Role of Leading-Edge Bumps in the Control of Stall Onset in Axial Fan Blades
,” ASME J. Fluids Eng.
, 135
(8
), p. 81104
.10.1115/1.40241157.
Van der Spuy
, S. J.
, Von Backström
, T. W.
, and Kröger
, D. G.
, 2009
, “Performance of Low-Noise Fans in Power Plant Air-Cooled Steam Condensers
,” Noise Control Eng.
, 57
(4
), pp. 1
–7
.10.3397/1.31518518.
Thiart
, G. D.
, 1990
, “A Numerical Procedure for Predicting the Effects of Distorted Inflow Conditions on the Performance of Axial Flow Fans
,” Ph.D. thesis, University of Stellenbosch, Stellenbosch, Republic of South Africa.9.
Bredell
, J.
, Kroger
, D. G.
, and Thiart
, G.
, 2006
, “Numerical Investigation of Fan Performance in a Forced Draft Air-Cooled Steam Condenser
,” Appl. Therm. Eng.
, 26
(8–9
), pp. 846
–852
.10.1016/j.applthermaleng.2005.09.02010.
Van Rooyen
, J. A.
, and Kröger
, D. G.
, 2008
, “Performance Trends of an Air-Cooled Steam Condenser Under Windy Conditions
,” ASME J. Eng. Gas Turbines Power
, 130
(2
), p. 023006
.10.1115/1.277156711.
Meyer
, C. J.
, and Kröger
, D. G.
, 2001
, “Numerical Simulation of the Flow Field in the Vicinity of an Axial Flow Fan
,” Int. J. Numer. Methods Fluids
, 36
(8
), pp. 947
–969
.10.1002/fld.16112.
Duvenhage
, K.
, Vermeulen
, J. A.
, Meyer
, C. J.
, and Kröger
, D. G.
, 1996
, “Flow Distortions at the Fan Inlet of Forced-Draft Air-Cooled Heat Exchangers
,” Appl. Therm. Eng.
, 16
(8–9), pp. 741
–752
.10.1016/1359-4311(95)00063-113.
Van der Spuy
, S. J.
, 2011
, “Perimeter Fan Performance in Forced Draft Air-Cooled Steam Condensers
,” Ph.D. thesis, University of Stellenbosch, Republic of South Africa.14.
McGhee
, R. J.
, and Beasley
, W. D.
, 1976
, “Effects of Thickness on the Aerodynamic Characteristics of an Initial Low-Speed Family of Airfoils for General Aviation Applications
,” National Aeronautics and Space Administration, Langley Research Center, Hampton, VA, Technical Report No. NASA TM X-72843.15.
Himmelskamp
, H.
, 1947
, “Profile Investigations on a Rotating Airscrew
,” Ph.D. thesis, University of Göttingen, Germany.16.
Yu
, G.
, Shen
, X.
, Zhu
, X.
, and Du
, Z.
, 2011
, “An Insight Into the Separate Flow and Stall Delay for HAWT
,” Renew. Energy
, 36
(1
), pp. 69
–76
.10.1016/j.renene.2010.05.02117.
Johansen
, J.
, and Sorensen
, N. N.
, 2004
, “Aerofoil Characteristics From 3D CFD Rotor Computations
,” Wind Energy
, 7
(4
), pp. 283
–294
.10.1002/we.12718.
Tangler
, J. L.
, 2004
, “Insight Into Wind Turbine Stall and Post-Stall Aerodynamics
,” Wind Energy
, 7
(3
), pp. 247
–260
.10.1002/we.12219.
Carcangiu
, C. E.
, Sørensen
, J. N.
, Cambuli
, F.
, and Mandas
, N.
, 2007
, “CFDRANS Analysis of the Rotational Effects on the Boundary Layer of Wind Turbine Blades
,” J. Phys. Conf. Ser.
, 75
, p. 012031
.10.1088/1742-6596/75/1/01203120.
Louw
, F. G.
, Von Backström
, T. W.
, and Van der Spuy
, S. J.
, 2014
, “Investigation of the Flow Field in the Vicinity of an Axial Flwo Fan During Low Flow Rates
,” ASME
Paper No. GT2014-25927.10.1115/GT2014-2592721.
Louw
, F. G.
, Bruneau
, P. R. P.
, Von Backström
, T. W.
, and Van der Spuy
, S. J.
, 2012
, “The Design of an Axial Flow Fan for Application in Large Air-Cooled Heat Exchangers
,” ASME
Paper No. GT2012-69733.10.1115/GT2012-6973322.
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—Model Development and Validation
,” Comp. Fluids
, 24
(3
), pp. 227
–238
.10.1016/0045-7930(94)00032-T23.
Hurault
, J.
, Kouidri
, S.
, Bakir
, F.
, and Rey
, R.
, 2010
, “Experimental and Numerical Study of the Sweep Effect on Three-Dimensional Flow Downstream of Axial Flow Fans
,” Flow Meas. Instrum.
, 21
(2
), pp. 155
–165
.10.1016/j.flowmeasinst.2010.02.00324.
Borello
, D.
, Corsini
, A.
, Delibra
, G.
, Fiorito
, M.
, and Sheard
, A. G.
, 2013
, “Large-Eddy Simulation of a Tunnel Ventilation Fan
,” ASME J. Fluids Eng.
, 135
(7
), p. 71102
.10.1115/1.4023686Copyright © 2015 by ASME
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