Design and Numerical Simulation of Symmetric Multistage Canned Motor Pump

Abstract

Due to the advantages of high head, no leakage, multistage
canned motor pump is widely used in the national economic
construction department. At present, in the premise of guarantee
reliability, saving energy efficient become an important
development direction of canned motor pump. In order to
research and improve the performance of the pump, this paper
designed and used symmetric multistage canned motor pump
DBP15-50x8 as the research object. Three-dimensional model of
the main flow passage components is built and the mesh is
generated respectively by using Pro/E and ICEM software, and
we calculated the whole internal flow field of the pump that was
selected by using ANSYS CFX software, achieving the pressure
and velocity distribution rule in the pump and the internal details
of flow in impeller and other main flow components. It is found
that there is pre-whirl flow in the front of inlet in the first stage
impeller under the conditions of 0.5 Q and Q flux, obtained the
unstableness in inlet when this pump works under the low flux
conditions. The post-processing showed the internal flow of
bearing section and volute is chaotic, etc. The results provide
theoretical basis for the design optimization of multistage canned
motor pump.