Studies on velocity fields around the cavitation vortices generated by the model of a rotating blade

• Autorzy: Suchecki W.

Identyfikatory

DOI

10.2478/pomr-2018-0055

• Języki publikacji: EN

Abstrakty

EN

The elimination of hazards caused by cavitation phenomena is an important issue to be considered in the design of process equipment including flow machinery. These hazards are: cavitation erosion, efficiency decrease as well as vibration and noise. One of the most intensive and dangerous forms of cavitation is vortex cavitation that accompanies the operation of hydraulic machines in which components comprised of rotating blades are applied. Velocity fields around cavitation vortices generated by the model of a propeller blade were experimentally studied in a cavitation tunnel. Flow images were recorded using a high-speed camera and processed using particle image velocimetry (PIV) complemented with computer-aided techniques that had been developed for the purpose of this research. These techniques included the removal of image distortions on the basis of a calibration mask, determination of instantaneous velocity distributions and removal of air-bubble traces from flow images. Experimental studies result examples were presented in the form of velocity fields determined in the longitudinal plane as well as in three transverse planes remote from the blade. Instabilities of the cavitating vortex stream and of the local liquid-flow velocity in its surrounding were detected. The effect of the angle of attack of propeller blade on the instability of the vortex stream and the effect of the presence of the cavitating vortex kernel on the local velocities of the surrounding liquid, were determined.

Słowa kluczowe

EN

experimental techniques; PIV; cavitation; rotary hydraulic machinery

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2018
• Tom: nr 2
• Strony: 66--70
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Suchecki W.

• Warsaw University of Technology The Faculty of Civil Engineering Mechanics and Petrochemistry Institute of Mechanical Engineering Department of Process Equipment Jachowicza 2/4 09-402 Płock Poland

Bibliografia

• 1. Campos–Amezcua R., Bakir F., Campos–Amezcua A., Khelladi S., Palacios-Gallegos M., Rey R.: Numerical analysis of unsteady cavitating flow in an axial inducer, Applied Thermal Engineering, 75, 2015, pp. 1302-1310.
• 2. Cumings D.E.: Numerical prediction of propeller characteristics, J. Ship Res., 17(1), 1973, pp. 12-18.
• 3. Ji B., Luo X., Peng X., Wu Y., Xu H.: Numerical analysis of cavitation evolution and excited pressure fluctuation around a propeller in non-uniform wake, International Journal of Multiphase Flow, 43, 2012, pp. 13-21.
• 4. Kerwin J.: Computer techniques for propeller blade section design, Int. Shipbuilding Progress, 20(227), 1973, pp. 227-251.
• 5. Ladino J.A., Herrera J., Malagón D.H., Prisciandaro M.,, Piemonte V., Capocelli M.: Biodiesel production via hydrodynamic cavitation: numerical study of new geometrical arrangements, Chemical Engineering Transactions, 50, 2016, pp. 319-324.
• 6. Noordzij L.: Pressure field by a cavitating propeller, Int. Shipbuilding Progress, 23(260), 1976, pp. 93-105.
• 7. Sanchez-Forero D.I., Klock Da Costa K., Amaral R.L., Taranto O.P., Mori M.: Influence of liquid viscosity and solid load in a three- phase bubble column using stereoscopic particle image velocimetry (stereo-PIV), Chemical Engineering Transactions, 43, 2015, pp. 1579-1584.
• 8. Singhal A.K., Athavale M.M, Li H., Jiang Y.: Mathematical Basis and Validation of the Full Cavitation Model, Journal of Fluids Engineering, 124(3), 2002, pp. 617-624.
• 9. Suchecki W., Alabrudziński S.: Research Report – Task 1, Experimental Measurements of the Cavitating Vortex Kernel and Velocity in its Close Vicinity, Warsaw University of Technology, Poland (in Polish) 2011.
• 10. Suchecki W.: Research on liquid flow in industrial apparatuses by means of both visualization and numerical simulation methods, Warsaw University of Technology Publishing House, Warsaw, Poland (in Polish) 2014.
• 11. Szantyr J.A., Flaszyński P., Tesch K., Suchecki W., Alabrudziński S.: An Experimental and Numerical Study of Tip Vortex Cavitation, Polish Maritime Research, 4(71), 18, 2011, pp. 14-22.

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).