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Numerical calculation and analysis on axial thrust in screw centrifugal pump |
LI Ren-Nian, QUAN Hui, HAN Wei, LI Qi-Fei, SU Qing-Miao |
(1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou,Gansu 730050, China; 2. School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou,Gansu 730050, China) |
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Abstract When the axial thrust is estimated in a screw centrifugal pump under solidliquid twophase flow conditions by means of ordinary analytical methods, there exists problems, such as mathematic models establishment of flow and difficulties in closure of the models. Thus in order to predict the axial thrust precisely and to correlate it to the physical property parameters of the medium handled by the pump, the axial thrust in the screw centrifugal pump of type 150×100LN-32 was calculated when it transported a sandwater twophase fluid by using CFD codeFluent. The twophase flow in the pump was described by the timeaveraged Navier-Stokes equations in relative coordinate systems and the mixture model. The standard k-ε twoequation turbulence model and the SIMPLE algorithm were used in numerical simulations. An axial thrust was calculated after the pressure distributions in the pump were available. In this way, the problems and the difficulty aforementioned can be avoided. The relations of axial thrust to solid volume fraction, particle diameter and flow rate of the twophase flow were explored by using the computational results. The results showed that the axial thrust rises with increasing solid volume fraction, but reduces with increasing flow rate and particle diameter. The conclusion is of great significance for improving the stability of the pump and extending its lifespan.
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Received: 15 December 2010
Published: 30 September 2012
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