Numerical simulation of the cavitation micro_jet velocity and erosion on a plane_convex hydrofoil with semicylindrical obstacle

29th IAHR Symposium on Hydraulic Machinery and Systems

Hidalgo, V.^1 ; Luo, X.^2 ; Escaler, X.^3 ; Valencia, E.^1 ; Cruz, P.^4

Departamento de Ingeniería Mecánica, Escuela Politécnica Nacional, Quito, Ecuador^1

State Key Laboratory of Hydro Science and Engineering, Tsinghua University, Beijing, China^2

Centre for Industrial Diagnostics and Fluid Dynamics, UPC, Barcelona, Spain^3

Dpto. de Automatización y Control Industrial, Escuela Politécnica Nacional, Quito, Ecuador^4

关键词: Cavitation model;    Cavitation tunnels;    Homogeneous mixtures;    Micro jet;    OpenFOAM;    Plane convex;    PYTHON language;    Unsteady cavitating flows;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/6/062018/pdf
DOI  :  10.1088/1755-1315/240/6/062018

来源: IOP

【 摘 要 】

The present study deals with the numerical study of the cavitation micro-jet velocity and erosion on a plane-convex hydrofoil with semicylindrical obstacle, which induces a big cluster of cavities with a strong erosive power. The proposed model predicts micro-jet velocities based on energy conservation by assuming potential and kinetic energies at the start and the end of the cavity collapses. Homogeneous mixture flow, implicit LES and Zwart-Gerber-Belamri cavitation model have been used for the numerical simulation of the unsteady cavitating flow using OpenFOAM, whilst for the micro-jet estimation, Python language coupled with OpenFOAM's calculator have been used. Results clearly show that the implemented model captures adequately the phenomenon and enables to identify attacked areas. Outcomes agree reasonably with the experimental results obtained by Escaler at the High Speed Cavitation Tunnel of the École Polytechnique Fédérale de Lausanne (EPFL). Furthermore, the proposed model has been compared with Li's and Peters' ones for a better understating of the improvements.