Relationship between cavitation structures and cavitation damage

被引:245
作者
Dular, M
Bachert, B
Stoffel, B
Sirok, B
机构
[1] TH Darmstadt, Chair Turbomachinery & Fluid Power, D-64289 Darmstadt, Germany
[2] Univ Ljubljana, Lab Water Turbine Machines, Ljubljana 1000, Slovenia
关键词
cavitation; damage; computer-aided image processing; single hydrofoil; pit-count method;
D O I
10.1016/j.wear.2004.08.004
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A study of visual and erosion effects of cavitation on simple single hydrofoil configurations in a cavitation tunnel was made. A two-dimensional hydrofoil with circular leading edge was used for the experiments. In addition, the hydrofoil geometry was modified to obtain some three-dimensional cavitation effects. A thin copper foil, applied to the surface of the hydrofoil, was used as an erosion sensor. Cavitation phenomenon above hydrofoils at different flow conditions (system pressure, water gas content) was observed. Images of vapour cavities from above and from side view were taken. A statistical evaluation of cavitation structures was made. Images of damaged copper coated hydrofoil surface were taken under sufficient magnification. A pit-count method, based on computer-aided image processing, was used for direct measurement of the cavitation erosion by evaluating the damage of the surface of the hydrofoil. A relation between characteristics of cavitation structures and cavitation damage was established. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:1176 / 1184
页数:9
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