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논문 기본 정보

자료유형
학술저널
저자정보
Jean-Bastien Carrat (Univ. Grenoble Alpes) Regiane Fortes-Patella (Univ. Grenoble Alpes) Jean-Pierre Franc (Univ. Grenoble Alpes)
저널정보
한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.12 No.2
발행연도
2019.6
수록면
136 - 146 (11page)
DOI
10.5293/IJFMS.2019.12.2.136

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초록· 키워드

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This paper presents a joint experimental and numerical analysis of the erosive potential of an unsteady cavity that develops at the leading edge of a two-dimensional hydrofoil and periodically sheds vapour clouds. From an experimental viewpoint, the erosive potential was characterized by pressure pulse height spectra. The hydrofoil was equipped with eight pressure sensors made of PVDF piezoelectric film that allowed the measurement of flow aggressiveness at different locations along the hydrofoil chord. It was shown that the mean peak rate over a large number of cavity pulsations exhibits a maximum at a distance from the leading edge close to the maximum cavity length. Moreover, the increase in flow aggressiveness caused by an increase in flow velocity can be explained by an increase in both amplitude and frequency of impact loads. From a numerical viewpoint, the unsteady Reynolds averaged Navier-Stokes (RANS) equations were solved using a modified k-ε RNG turbulence model together with a homogeneous cavitation model within a two-dimensional approach. Flow aggressiveness was estimated from the Lagrangian derivative of the computed void fraction that allows identifying the regions of collapse of vapour structures. Three different critical regions from an erosive viewpoint were numerically identified. Apart from the region of collapse of the shed cloud (which was not instrumented in the present study), the computations showed a maximum of aggressiveness around the maximum cavity length as found experimentally. Another region of high aggressiveness closer to the leading edge and associated to the upward movement of the re-entrant jet was predicted by the present numerical model but not confirmed experimentally, which probably shows the limitation of a two-dimensional approach.
#Fluids dynamics #Cavitation erosion #Numerical calculations #Experimental measurements #Unsteady pressure measurements #PVDF sensors

목차

Abstract
1. Introduction
2. Hydrofoil geometry and experimental set-up
3. Experimental results and analyses
4. CFD simulations
5. Flow aggressiveness
6. Comparison between experimental and numerical results
7. Conclusion
References

참고문헌 (28)

참고문헌 신청
Knapp, R. T. / 1958 / Accelerated Field Tests of Cavitation Intensity / Trans. ASME :12 google schola Fortes-Patella, R. / 2000 / Cavitation Damage Measurement by 3D Laser Profilometry / Wear 246(1):59~67 google schola Belahadji, B. / 1991 / A Statistical Analysis of Cavitation Erosion Pits / J. Fluids Eng. 113(4):700~706 google schola Pöhl, F. / 2015 / Evaluation of Cavitation-Induced Pressure Loads Applied to Material Surfaces by Finite-Element-Assisted Pit Analysis and Numerical Investigation of the Elasto-Plastic Deformation of Metallic Materials / 20th Int. Conf. Wear Mater. 330?331:618~628 google schola Roy, S. C. / 2015 / Cavitation Erosion: Using the Target Material as a Pressure Sensor / J. Appl. Phys. 118(16):164905 google schola

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