The flow through the face clearance of the disk relieving the axial force in multi-stage centrifugal pump

• Autorzy: Korczak A. , Papierski A.
• Języki publikacji: EN

Abstrakty

EN

The paper deals with the turbulent flow through the face clearance, which is a characteristic element of the flow system of the disk which relieves the axial force in a multi-stage centrifugal pumps. The presented description illustrates the automodelling flow, i.e. the square dependence of hydraulic resistances on the flow rate, applying the model k-... and making use of the Tasc-Flow program of calculations. The essential aim was to compare the pressure fields in both these descriptions. The pressure field decides about the value and direction of the hydrodynamic moment affecting the walls of the clearance. The hydrodynamic forces and moments in the sealing clearances influence essentially the dynamic properties of the rotor of centrifugal pumps. The results of calculations have been compared basing on a numerical example with the same assumed geometry of the clearances, the same flow rate and the same pressure drop. The pressure fields obtained by means of both methods of calculations have been presented graphically, providing numerical values of the calculated axial forces and moments, as well as the direction of their activity. Moreover, for the selected cross-section of the clearance the fields of radial and spherical speeds have been given. The coefficients of the inlet resistance and continous resistance in the clearance, the application of which in the description of the automodelling flow provided the pressure field have been calculated sismilary as in the case of applying the model k-... . As we see, in order to obtain correct results, the description of the automodelling flow ougth to differentiate the coefficient of continuous resistance along the perimeter of the clearance.

Słowa kluczowe

EN

turbulent flow; face clearance

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2004
• Tom: nr 115
• Strony: 125--140
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Korczak A.

• lnstitute of Power Machinery,Silesian University of Technology, 44-101, Gliwice, Konarskiego 78, Poland

autor

Papierski A.

• Institute of Turbomachinery,Technical University o Łódź, Wólczańska 219 /223

Bibliografia

• 1. Korczak A.: Test stand for model balance disks relieving the axial forces in multistage centrifugal purrlps) 12th Sem. on Energy, Silesian University of Technology, Gliwice 2003 (in Polish).
• 2. Marcinkovski V.A.: Hydrodynamics of throttling flow channels, Publ. Sumy State Univ., Sumy 2002 (in Russian).
• 3. Kosyna G.: Investigations concerning radial-flow sealing clearence with a flat plates, taking into account parallel deviations, Doctor's Dissertation,Tech. Univ. Braunschweig 1976 (in German).
• 4. Jędral W.: Method, of calculating the axial thrust and balancing devices in centrifugal purmps (qualifying for proffesorship trial), Warsaw Univ. of Technology Publs., Mechanika, No. 110, Warsaw 1988 (in Polish).
• 5. Tchegurko L. E.: Balancing devices centrifugal boiler pumps ,in power station,Energiya, Moscow 1978 (in Russian).
• 6. Kazimierski Z.: Numerical determination of turbulent flows, Ossolineum, Wrocław 1992 ( in Polish).
• 7. Papierski A., Rabiega M.: Multiblock paraller computation of an incompressible 3-D flow in turbomachines, Task Quarterly 3, No. 1, (1999), 39-52.
• 8. Chodkiewicz R., Papierski A.: CFD code - a useful tool for the turbomachinery designer Sem./Summer School CFD for Tlrrbomachinery Apl,, 2001.
• 9. Rodi W,: Erperience u,ith two-layer models combining the model with a oneequation model near the wall, Amer. Inst. of Aeronautics and Astronautics Paper 91-0216, Amer. Inst. of Aeronautics and Astronautics 29th Aerospace Sci. Meeting, Reno, USA, Jan. 7-10.1991.
• 10. CFX-TASCflow Theory Documentation. Version 2.12., AEA Technology Engineering Software Ltd. Waterloo, Canada.