RANS computations of tip vortex cavitation

9th International Symposium on Cavitation

Decaix, Jean^1 ; Balarac, Guillaume^2,3 ; Dreyer, Matthieu^4 ; Farhat, Mohamed^4 ; Münch, Cécile^1

University of Applied Sciences and Arts, Western Switzerland, 47 Route du Rawyl, Sion

1950, Switzerland^1

Univ. Grenoble Alpes, LEGI, Grenoble

F-38000, France^2

CNRS, LEGI, Grenoble

F-38000, France^3

Ecole Polytechnique Fédérale de Lausanne, Laboratory for Hydraulic Machines, 33 Bis Av. De Cour, Lausanne

1007, Switzerland^4

关键词: Blade tip;    Liquid volume fraction;    Side walls;    Simplified test;    Tip vortex;    Tip vortex cavitations;    Transport equation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012183/pdf
DOI  :  10.1088/1742-6596/656/1/012183

来源: IOP

【 摘 要 】

The present study is related to the development of the tip vortex cavitation in Kaplan turbines. The investigation is carried out on a simplified test case consisting of a NACA0009 blade with a gap between the blade tip and the side wall. Computations with and without cavitation are performed using a R ANS modelling and a transport equation for the liquid volume fraction. Compared with experimental data, the R ANS computations turn out to be able to capture accurately the development of the tip vortex. The simulations have also highlighted the influence of cavitation on the tip vortex trajectory.