An Experimental and Numerical Study of Tip Vortex Cavitation

• Autorzy: Szantyr J. A. , Flaszyński P. , Suchecki W. , Alabrudziński S.
• Języki publikacji: EN

Abstrakty

EN

The article presents the results of the research project concerning tip vortex cavitation. This form of cavitation is very important in operation of many types of rotary hydraulic machines, including pumps, turbines and marine propellers. Tip vortex cavitation generates noise, vibration and erosion. It should be eliminated or significantly limited during the design of these types of machines. The objective of the project was to develop an accurate and reliable method for numerical prediction of tip vortex cavitation, which could serve this purpose. The project consisted of the laboratory experiments and numerical calculations. Inthe laboratory experiments tip vortex cavitation was generated behind a hydrofoil in the cavitation tunneland the velocity field around the cavitating kernel was measured using the Particle Image Velocimetry method. Measurements were conducted in three cross-sections of the cavitating tip vortex for a number ofangles of attack of the hydrofoil and for several values of the cavitation index. In the course of numerical calculations two commercial CFD codes were used: Fluent and CFX. Several available approaches to numerical modeling of tip vortex cavitation were applied and tested, attempting to reproduce the experimental conditions. The results of calculations were compared with the collected experimental data. The most promising computational approach was identified. Keywords:

Słowa kluczowe

EN

rotary hydraulic machinery; cavitation; numerical methods; experimental techniques

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2011
• Tom: nr 4
• Strony: 14--22
• Opis fizyczny: Bibliogr. 7 poz, rys., tab.

Twórcy

autor

Szantyr J. A.

autor

Flaszyński P.

autor

Suchecki W.

autor

Alabrudziński S.

• Faculty of Mechanical Engineering Gdansk University of Technology Narutowicza 11/12 80-231 Gdańsk, POLAND,

Bibliografia

• 1. Dymarski P., Szantyr J., Flaszyński P., Kraskowski M., Biernacki R.: Modelling of Tip Vortex Behind a Blade using Different Turbulence Models and Different RANSE Solvers, Proc. of the 11th Numerical Towing Tank Conference, Brest, France, September 8-10, 2008
• 2. Flaszyński P., Szantyr J., Dymarski P., Kraskowski M.: Numerical Prediction of Vortex Generated by a Hydrofoil, Proc. Of the International Symposium on Marine Propulsors, Trondheim, Norway, June 22-24, 2009
• 3. Flaszyński P., Szantyr J.: Biernacki R., Dymarski P., Kraskowski M.: A Method for the Accurate Numerical Prediction of the Tip Vortices Shed from Hydrofoils, Polish Maritime Research No. 2(65), Vol. 17, 2010, pp.10-17
• 4. Flaszyński P., Tesch K.: Research Report – Task 2 Calculations for the Selected Flow Configuration Using Different Cavitation Models (in Polish), Gdansk University of Technology 2011
• 5. Suchecki W., Alabrudziński S.: Research Report – Task 1 Experimental Measurements of the Geometry of the Cavitating Vortex Kernel and Velocity in its Close Vicinity (in Polish), Warsaw University of Technology 2011
• 6. Szantyr J., Biernacki R., Flaszyński P., Dymarski P., Kraskowski M.: An Experimental and Numerical Study of The Vortces Generated by Hydrofoils, Polish Maritime Research No. 3(61), Vol. 16, 2009, pp.11-17
• 7. Zwart P.J., Gerber A.G., Belamri T.: A Two-Phase Flow Model for Predicting Cavitation Dynamics, Fifth International Conference on Multiphase Flow, Yokohama, Japan, 2004