Numerical investigation of flow in mixed-flow pump with volute

• Autorzy: Sedlar M.
• Konferencja: Seminar/summer school on "CFD for turbomachinery applications" (01-03.09.2001, Gdańsk, Poland)
• Języki publikacji: EN

Abstrakty

EN

The work considers the modelling of flow in a complete mixed-flow pump with volute, including tip leakage flows, using both quasi-steady and true transient models of rotor/stator interaction. The CFX-TASCflow CFD package from AEA Technology is applied to calculate flows for a wide range of flow rates from about 0.2 to 1.4 Q/sub 0pt/. Fairly detailed flow structures have been predicted based on the flow rates, especially impeller inlet recirculation and separation on the suction side of the blades for suboptimal rates of flow, as well as strong secondary flows and separation in the volute for off-design conditions. The rotor/stator interaction influence on flow phenomena both in the impeller and volute have been investigated with very interesting results, providing good insight into the dynamics of flow close to the volute tongue. Based on the computational results, pump performance curves (Q-H, Q- eta /sub h/ and Q-P, eta /sub h/ being the hydraulic efficiency) have been obtained. The data from this numerical investigation have been used to improve the inlet part of the impeller blades, especially close to the tip. The geometry modifications have resulted in reduced cavitation in the impeller as well as noise at suboptimal rates of flow.

Słowa kluczowe

EN

CFD; computational fluid dynamics CFD; flow separation; cavitation; Navier-Stokes equation; unsteady phenomena; mixed-flow pump; volute

• Wydawca: Politechnika Gdańska
• Czasopismo: TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
• Rocznik: 2001
• Tom: Vol. 5, No 4
• Strony: 595--602
• Opis fizyczny: Bibliogr. 6 poz. rys.

Twórcy

autor

Sedlar M.

• SIGMA Research and Development Institute, Jana Sigmunda 79, 78350 Lutin, Czech Republic

Bibliografia

• [1] TASCflow CFD Software – User Documentation, 1999, AEA Technology, Waterloo, Ontario
• [2] Galpin P F, Bronberg R B and Hutchinson B R 1995 Three-Dimensional Navier Stokes Predictions of Steady State Rotor/Stator Interaction with Pitch Change Proc. Third Conference of the CFD Society of Canada
• [3] Sedlar M, Vlach M and Soukal J 1999 Numerical and Experimental Investigation of Flow in Axial-Flow Hydraulic Machinery Proc. 3rd European Conf. On Turbomachinery, London, pp. 1007 – 1016
• [4] Laborde R, Chantrel P and Mory M 1997 Journal of Fluids Engineering 119 680
• [5] Sedlar M, Marsik F and Safarik P 2000 Modelling of Cavitated Flows in Hydraulic Machinery Using Viscous Flow Computation and Bubble Dynamics Model Proc. Fluid Dynamics Prague, pp. 107 – 110
• [6] Goulas A and Truscott G F 1986 Dynamic Hydraulic Loading on a Centrifugal Pump Impeller Proc. Radial Loads and Axial Thrust on Centrifugal Pumps, London, pp. 53 – 64