캐비테이션 침식 추정 방법 개발 및 추진기에의 적용

다국어 초록 (Multilingual Abstract)

In the present study, a practical method to predict cavitation erosion, which caused a critical damage on hydraulic machineries, was developed. Impact and critical velocities were defined to develop a practical method for the prediction of cavitation erosion. To develope the practical method, the computational fluid dynamics (CFD) was introduced. Cavitating flows with erosion in a converging-diverging nozzle and around a hydrofoil were simulated by developed and validated code. Based on the CFD results, the cavitation erosion coefficient was derived by a curve fitting method. The cavitation erosion coefficient was formulated as the function of the cavitation and Reynolds numbers. A cavitating flow in an axisymmetric nozzle followed by radial divergence was simulated to validate the developed practical method. For the application to a propeller, a cavitating flow around a propeller was simulated. Predicted damage extent showed similar with damaged full-scale propeller blade.

참고문헌 (Reference)

1 Hinze, J.O., "Turbulence" McGraw Hill 1975

2 Stephanis, C.G., "The process (mechanism) of erosion of soluble brittle materials caused by cavitation" 4 : 269-271, 1997

3 Park, S., "Pressure-based solver for incompressible and isothermal compressible flows with cavitation" 2012

4 Hattori, S., "Prediction of cavitation erosion on stainless steel components in centrifugal pumps" 265 : 1870-1874, 2008

5 Bark, G., "On some physical to consider in numerical simulation of erosive cavitation" 2009

6 Ochiai, N., "Numerical prediction of cavitation erosion in cavitating flow" 2009

7 Dular, M., "Numerical modeling of cavitation Erosion" 61 : 1388-1410, 2009

8 Schnerr, G.H., "Numerical investigation of three-dimensional cloud cavitation with special emphasis on collapse induced shock dynamics" 20 : 040703.1-040703.9, 2008

9 Park, S., "Numerical analysis of the three-dimensional cloud cavitating flow around a twisted hydrofoil" 45 (45): 015502.1-015502.20, 2013

10 Szkodo, M., "Mathematical description and evaluation of cavitation erosion resistance of materials" 164 (164): 1631-1636, 2008

11 Franc, J.P., "Incubation time and Cavitation erosion rate of work-hardening materials" 131 : 021303.1-021303.4, 2009

12 Lush, P.A., "Impact of a liquid mass on a perfectly plastic solid" 135 : 373-387, 1983

13 Pfitsch, W., "Development of measurement techniques for studying propeller erosion damage in severre wake fields" 2009

14 Dular, M., "Development of a cavitation erosion model" 261 : 642-655, 2007

15 Park, S., "Computational analysis of turbulent super-cavitating flow around a two-dimensional wedge-shaped cavitator geometry" 70 : 73-85, 2012

16 Plesset, M.S., "Collapse of an initially spherical vapor cavity in the neighborhood of a solid boundary" 47 : 283-290, 1971

17 Keil, T., "Cloud cavitation and cavitation erosion in convergent divergent nozzle" 2011

18 Fortes-Patella, R., "Cavitation erosion mechanism: numerical simulation of the interaction between pressure waves and solid boundaries" 2001

19 van Terwisga, T.J.C., "Cavitation erosion - a review of physical mechanisms and erosion risk models" 2009

20 Brennen, C.E., "Cavitation and bubble dynamics" Oxford University Press 1995

21 Sedlar, M., "CFD analysis of cavitation erosion potential in hydraulic machinery" 2009

22 Berchiche, N., "A cavitation erosion model for ductile materials" 124 : 601-606, 2002