Numerical simulation of erosion and particle motion trajectory 

in centrifugal pump with major diameter particles

 

 

DONG Wenlong, LI Yi

 

(Faculty of Mechanical Engineering & Automation, Zhejiang SciTech University, Hangzhou 310018, China)

 

 

Abstract: Aiming at the Solidliquid two phase flow problems, considering the turbulence coupling of the liquid phase and the interaction between solid particles, motion of tracer particles in the centrifugal pump was simulated. Solidliquid two phase flow wear was calculated by discrete phase model. UDF about Basset force was used in the simulation. Comparing particle trajectory with fluid streamline and analyzing the particle speed changed in the relationship with the spatial scale, the particles tracking characteristics were studied. Based on the analysis, Inner flow characteristics of centrifugal pump and wear rules were carried out. The results indicate that when the particle diameter is greater than 1mm DPM model can carry out the movement of the particles much better. By contraries, little particle is liable to impact the rearend surface of impeller near to the outlet side. The major solid particle could repeatedly impact machine surface easier than the little particle.

 

Key words: centrifugal pump; discrete phase model; numerical simulation; Basset force