Based on computational fluid dynamics and the finite volume method, water droplet erosion in the last stage of an industrial steam turbine was researched and the trajectories of the water droplets were traced by using the Lagrange method. Under steady conditions, the influence of variant bowed vane designs was compared based on the distribution and movement trends of the secondary water droplets. In addition, the effects of the bowed blades on water movement at the vane surfaces and their impact areas and intensity on the blades were analyzed. The results showed that: (1) a negatively bowed blade can reduce the speed of the secondary water droplets at the mid span of the blade, which are also effective for water droplets on the surface of the vanes and (2) a negatively bowed blade improves the speed of the secondary droplets on the end walls of vanes, which is advantageous to the secondary droplets through blade passage and reduction of secondary droplet impulse on the blades.
Issue Section:
Techniques and Procedures
References
1.
Starzmann
, J.
, Schatz
, M.
, Casey
, M. V.
, and Mayer
, J. F.
, 2011
, “Modeling and Validation of Wet Steam Flow in a Low Pressure Steam Turbine,” ASME
Paper No. GT2011-45672.2.
Kirolsa
, H. S.
, Mahdipoora
, M. S.
, Kevorkova
, D.
, Uihleinb
, A.
, and Medraj
, M.
, 2016
, “Energy Based Approach for Understanding Water Droplet Erosion
,” Mater. Des.
, 104
, pp. 76
–86
.3.
Mahdipoor
, M. S.
, Kevorkov
, D.
, Jedrzejowski
, P.
, and Medraj
, M.
, 2016
, “Water Droplet Erosion Behaviour of Gas Nitrided Ti6Al4V
,” Surf. Coat. Technol.
, 292
, pp. 78
–89
.4.
Robinson
, J. M.
, and Reed
, R. C.
, 1995
, “Water Droplet Erosion of Laser Surface Treated Ti-6A1-4V
,” Wear
, 186–187
(Pt. 2
), pp. 360
–367
.5.
Slot
, H. M.
, Gelinck
, E. R. M.
, Rentrop
, C.
, and Heide
, E. V. D.
, 2015
, “Leading Edge Erosion of Coated Wind Turbine Blades: Review of Coating Life Models
,” Renewable Energy
, 80
, pp. 837
–848
.6.
Valaker
, E. A.
, Armada
, S.
, and Wilson
, S.
, 2015
, “Droplet Erosion Protection Coatings for Offshore Wind Turbine Blades
,” Energy Procedia
, 80
, pp. 263
–275
.7.
Luiset
, B.
, Sanchette
, F.
, Billard
, A.
, and Schuster
, D.
, 2013
, “Mechanisms of Stainless Steels Erosion by Water Droplets
,” Wear
, 303
(1–2), pp. 459
–464
.8.
Kamkar
, N.
, Bridier
, F.
, Jedrzejowski
, P.
, and Bocher
, P.
, 2015
, “Water Droplet Impact Erosion Damage Initiation in Forged Ti–6Al–4V
,” Wear
, 322–323
, pp. 192
–202
.9.
Oka
, Y. I.
, Mihara
, S.
, and Miyata
, H.
, 2007
, “Effective Parameters for Erosion Caused by Water Droplet Impingement and Applications to Surface Treatment Technology
,” Wear
, 263
(1–6), pp. 386
–394
.10.
Mahdipoor
, M. S.
, Kevorkov
, D.
, Jedrzejowski
, P.
, and Medraj
, M.
, 2016
, “Water Droplet Erosion Mechanism of Nearly Fully-Lamellar Gamma TiAl Alloy
,” Mater. Des.
, 89
, pp. 1095
–1106
.11.
Kamkar
, N.
, Bridier
, F.
, Bocher
, P.
, and Jedrzejowski
, P.
, 2013
, “Water Droplet Erosion Mechanisms in Rolled Ti–6Al–4V
,” Wear
, 301
(1–2), pp. 442
–448
.12.
Gujba
, A. K.
, Hackel
, L.
, Kevorkov
, D.
, and Medraj
, M.
, 2016
, “Water Droplet Erosion Behaviour of Ti–6Al–4V and Mechanisms of Material Damage at the Early and Advanced Stages
,” Wear
, 358–359
, pp. 109
–122
.13.
Kirols
, H. S.
, Kevorkov
, D.
, Uihlein
, A.
, and Medraj
, M.
, 2015
, “The Effect of Initial Surface Roughness on Water Droplet Erosion Behavior
,” Wear
, 342–343
, pp. 198
–209
.14.
Fujisawa
, N.
, Yamagata
, T.
, Takano
, S.
, Saito
, K.
, Morita
, R.
, Fujiwara
, K.
, and Inada
, F.
, 2015
, “The Influence of Material Hardness on Liquid Droplet Impingement Erosion
,” Nucl. Eng. Des.
, 288
, pp. 27
–34
.15.
Hattori
, S.
, and Kakuichi
, M.
, 2013
, “Effect of Impact Angle on Liquid Droplet Impingement Erosion
,” Wear
, 298–299
, pp. 1
–7
.16.
Ahmad
, M.
, Schatz
, M.
, and Casey
, M. V.
, 2013
, “Experimental Investigation of Droplet Size Influence on Low Pressure Steam Turbine Blade Erosion
,” Wear
, 303
(1–2), pp. 83
–86
.17.
Koka
, T.
, John
, P. Z.
, and Dayalan
, S.
, 2014
, “Water Droplet Erosion Simulation of a Turbocharger Compressor Wheel,” ASME
Paper No. GT2014-26974. 18.
Han
, Y.
, Xie
, Y.
, and Zhang
, D.
, 2012
, “Numerical Study on High-Speed Impact Between a Water Droplet and a Deformable Solid Surface,” ASME
Paper No. GT2012-69700.19.
Starzmann
, J.
, Kaluza
, P.
, and Casey
, M. V.
, 2013
, “On Kinematic Relaxation and Deposition of Water Droplets in the Last Stages of Low Pressure Steam Turbine,” ASME
Paper No. GT2013-95179.20.
Hesketh
, J. A.
, and Walker
, P. J.
, 2005
, “Effects of Wetness in Steam Turbines
,” Proc. Inst. Mech. Eng.: Part C, J. Mech. Eng. Sci.
, 219
(12
), pp. 1301
–1314
.21.
Stüer
, H.
, Truckenmüller
, F.
, Borthwick
, D.
, and Denton
, J. D.
, 2005
, “Aerodynamic Concept for Very Large Steam Turbine Last Stages,” ASME
Paper No. GT2005-68746.22.
Sigg
, R.
, Casey
, M. V.
, Mayer
, J. F.
, and Sürken
, N.
, 2008
, “The Influence of Lean and Sweep in a Low Pressure Steam Turbine: Analysis of Three Stages With a 3D CFD Model,” ASME
Paper No. GT2008-50161.23.
Ono
, H.
, Senoo
, S.
, Kudo
, T.
, and Murata
, K.
, 2013
, “The Effects of the Tangential Leans for the Last Stage Nozzles of Steam Turbine,” ASME
Paper No. GT2013-95827.24.
Yamamoto
, S.
, 2005
, “Computation of Practical Flow Problems With Release of Latent Heat
,” Energy
, 30
(2–4), pp. 197
–208
.25.
Wróblewski
, W.
, and Dykas
, S.
, 2016
, “Two-Fluid Model With Droplet Size Distribution for Condensing Steam Flows
,” Energy
, 106
, pp. 112
–120
.26.
Li
, N.
, Zhou
, Q.
, Chen
, X.
, Xu
, T.
, Hui
, S.
, and Zhang
, D.
, 2008
, “Liquid Drop Impact on Solid Surface With Application to Water Drop Erosion on Turbine Blades—Part I: Nonlinear Wave Model and Solution of One-Dimensional Impact
,” Int. J. Mech. Sci.
, 50
(10–11), pp. 1526
–1542
.27.
Zhou
, Q.
, Li
, N.
, Chen
, X.
, Xu
, T.
, Hui
, S.
, and Zhang
, D.
, 2008
, “Liquid Drop Impact on Solid Surface With Application to Water Drop Erosion on Turbine Blades—Part II: Axisymmetric Solution and Erosion Analysis
,” Int. J. Mech. Sci.
, 50
(10–11), pp. 1543–1558.28.
Zhou
, Q.
, Li
, N.
, Chen
, X.
, Xu
, T.
, Hui
, S.
, and Zhang
, D.
, 2009
, “Analysis of Water Drop Erosion on Turbine Blades Based on a Nonlinear Liquid–Solid Impact Model
,” Int. J. Mech. Sci.
, 36
(9), pp. 1156
–1171
.29.
ANSYS,
2011
, “ANSYS CFX-Solver Theory Guide, Release 14.0
,” ANSYS, Canonsburg, PA, accessed Dec. 28, 2017, https://www.scribd.com/document/146465149/ANSYS-CFX-Solver-Theory-Guide30.
ANSYS
, 2011
, “ANSYS TurboGrid User's Guide, Release 14.0
,” ANSYS, Canonsburg, PA, accessed Dec. 28, 2017, http://www.ansys.com/products/fluids/ansys-turbogrid31.
Wróblewski
, W.
, Dykas
, S.
, Gardzilewicz
, A.
, and Kolovratnik
, M.
, 2009
, “Numerical and Experimental Investigations of Steam Condensation in LP Part of a Large Power Turbine
,” ASME J. Fluids Eng.
, 134
(4
), p. 041301
.32.
Mazumder
, Q. H.
, Ahmed
, K.
, and Zhao
, S.
, 2015
, “Experimental Investigation of Solid Particle Erosion in S-Bend
,” ASME J. Fluid Eng.
, 138
(4
), p. 044501
.33.
Yu
, R.
, Zhang
, Z.
, and Pang
, F.
, 1992
, “Test and Study of the Corrugated Steam Separator
,” Nucl. Power Eng.
, 13
(6
), pp. 21
–25
. (in Chinese)34.
Ling
, J.
, Elkins
, C. J.
, and Eaton
, J. K.
, 2015
, “Optimal Turbulent Schmidt Number for RANS Modeling of Trailing Edge Slot Film Cooling
,” ASME J. Eng. Gas Turbines Power
, 137
(7
), p. 072605
.35.
Dosanjh
, S.
, and Humphrey
, J. A. C.
, 1985
, “The Influence of Turbulence on Erosion by a Particle Laden Fluid Jet
,” Wear
, 102
(4), pp. 309
–330
.Copyright © 2018 by ASME
You do not currently have access to this content.
