Erosion-fatigue of steam turbine blades

Azevedo, César Roberto de Farias; Sinatora, Amilton

doi:10.1016/j.engfailanal.2009.03.007

Cited by 61 publications

(57 citation statements)

References 19 publications

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“…Erosion as a prevailing problem did not come as a surprise, as it is a problem often encountered in steam turbines (Staniša and Ivušić, 1995;Azevedo and Sinátora, 2009). This article however highlights the importance of either predicting or preventing such erosion and the fact that this is not being conducted in an efficient manner.…”

Section: Discussionmentioning

confidence: 98%

Innovation and development in geothermal turbine maintenance based on Icelandic experience

2015

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Section: Discussionmentioning

confidence: 98%

Innovation and development in geothermal turbine maintenance based on Icelandic experience

2015

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“…Relatively large, characterized with low velocity, water droplets hit the leading edge of rotor blades, Azevedo and Sinatora (2009). This impact gives rise to localized surface stress and results in pits, cracks in the surface, or mass loss of the material, as described by Atrens et al, (1983), Azevedo and Sinatora (2009), White (1992), Vishvanathan (1989), Ansari (1986).…”

Section: Introductionmentioning

confidence: 99%

“…Both the erosion and deposition phenomenon change the surface finish; stationary and rotating blade flow areas; alter the shape of leading and trailing edges (Wang et al, (2007) and Azevedo and Sinatora (2009), increase the blade surface roughness (Martinez et al, (2011), A. CamposAmezcua et al, (2007 and introduce irregularities in the steam path, resulting in eddies generation with losses these eddies produce, see Atrens et al, (1983), Azevedo and Sinatora (2009), White (1992), Vishvanathan (1989), Ansari (1986) and Springer (1976).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Water Droplets Deposition on Turbine Blade Surfaces and Erosion Wear Effects

Ilieva¹

2017

JAFM

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Failure of turbine blades leads to various exploitation problems, efficiency decrease and economical losses, at all. A detailed research on aerodynamic features, in various exploitation conditions and regimes, and on reasons for failures, is a prerequisite to the obviated technical problems and increased reliability of turbine aggregates. Water droplets erosion is known as a very complex and crucial phenomena. It couples the effects of wet steam expansion, together with condensation (evaporation), presence of second phase with the impact of water droplets over blade surfaces, erosion effects and fatigue mechanisms. The present research deals with a logical sequence for numerical simulations and research on erosion mechanisms in a low pressure stage of К-1000-6 /1500 steam turbine, working at a Nuclear Power Plant. Attention is paid to the impact of droplets' diameter on blade surfaces, their aerodynamic behavior and efficiency of energy conversion through turbine channels. Particular trajectories of water droplets, reasons for occurrence of erosion wear, over certain parts of the streamlined surfaces, are established and discussed. An approach to acquire incidence time to erosion appearance is implemented. Research methodology and obtained results are applicable to determine erosion effects on streamed complex surfaces, to replace expensive measurements campaigns, introduce approaches to decrease wetness in last stages of condensation turbines and prolong the reliability of blades operated in wet steam conditions

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“…The maximal size of particles is 300 µm and their hardness is HB (Brünell) 700÷750. The solid particles interaction parameters entrained in steam flow vary in a wide range (Azevedo, 2009;Campos-Amezcua, 2007;Wellman, 2012). The main parameters characterizing the solid particles impingement on a surface are: the impingement angle, impingement velocity, solid particles concentration and the contact surfaces temperature (Li, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…According to (Truhnij and Lomakin, 2002;Kleis et al, 2008;Wang, 2013), after five years operation the SPE of stator blades and associated components of the 550 MW turbine HPC control stage resulted in the entire turbine efficiency reduction by 0,4%. According to estimates (Azevedo, 2009), in the USA annual damage caused by SPE to a typical turbine power generating unit amounts to 600 thousand dollars, and the nationwide total annual damage caused by SPE is about 150 million dollars.…”

Section: Introductionmentioning

confidence: 99%

The Investigation of Construction Materials and Protective Coatings Wear Resistance to Solid Particle Erosion

Ryzhenkov¹,

Kachalin²,

Mednikov³

et al. 2014

MAS

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This article presents a description of a test rig for solid particle erosion resistance of construction materials and protective coatings investigation, as well as equipment for preparing products surfaces and protective coatings formation. The authors discuss a method of velocities and trajectories determination of solid particles that impinge on a metal surface using multiple exposure photo registration. The results of a steel 20Kh13 (X 20 Cr 13) specimen with a 2D nanostructured ion -plasma coating solid particle erosion resistance investigation are reported. It is shown that a protective coating increases resistance of blade steel 20Kh13 (X 20 Cr 13) to solid particle erosion by more than twice.

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Erosion-fatigue of steam turbine blades

Cited by 61 publications

References 19 publications

Innovation and development in geothermal turbine maintenance based on Icelandic experience

Innovation and development in geothermal turbine maintenance based on Icelandic experience

Mechanisms of Water Droplets Deposition on Turbine Blade Surfaces and Erosion Wear Effects

The Investigation of Construction Materials and Protective Coatings Wear Resistance to Solid Particle Erosion

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