Water Drop Erosion on Turbine Blades: Numerical Framework and Applications

• Zhou Qulan

  The State Key Laboratory of Power Engineering Multiphase Flow, Xi’an Jiaotong University Department of Civil Engineering and Engineering Mechanics, Columbia University

• Li Na

  The State Key Laboratory of Power Engineering Multiphase Flow, Xi’an Jiaotong University Department of Civil Engineering and Engineering Mechanics, Columbia University

• Chen Xi

  Department of Civil Engineering and Engineering Mechanics, Columbia University

• Yonezu Akio

  Department of Mechanical Engineering, Osaka University

• Xu Tongmo

  The State Key Laboratory of Power Engineering Multiphase Flow, Xi’an Jiaotong University

• Hui Shien

  The State Key Laboratory of Power Engineering Multiphase Flow, Xi’an Jiaotong University

• Zhang Di

  The State Key Laboratory of Power Engineering Multiphase Flow, Xi’an Jiaotong University

抄録

When small droplets are formed in the wet steam stage of a steam turbine, they may impact the blade surface at a high velocity and repetitive impacts cause water drop erosion, which emerges as one of the primary reliability concerns of the turbine. We propose an effective numerical framework that couples fluid mechanics with solid mechanics. The movements of water drops in a blade channel are analyzed based on the solution of the flow field of water steam in turbine, and impact statistics such as impact frequency, velocity, and position are obtained as the working condition and particle size are varied. A nonlinear wave model is established for high velocity liquid-solid impact, from which the characteristic impact pressure in liquid and peak impact stress in solid are obtained; the solutions are then superimposed with the pathways of water particles, and a fatigue analysis is carried out to elucidate the mechanisms of water drop erosion. The lifetime map on a blade surface with two different materials (1Cr13 and Ti-6Al-4V) under typical working conditions are obtained, in terms of operation hours, and the most dangerous water drop erosion regions and operating conditions of the steam turbine are deduced.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 49 (7), 1606-1615, 2008

  公益社団法人 日本金属学会

キーワード

• water drop erosion
• liquid-solid impact
• numerical simulation

詳細情報

• CRID: 1390001204249185536
• NII論文ID: 10021148338
• NII論文ID: 130004454041
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.mra2008025
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 9555676
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9555676
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/49/7/49_MRA2008025/_pdf
• 本文言語コード: en
• データソース種別:
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