Computer Aided Design and Flow Analysis of the Mixture Water Centrifugal Pump Impeller in Heating System

Based on streamline iteration method and point-by-point integration method,a computer code was developed in FORTRAN language to design the mixture water centrifugal pump in heating system in this paper.The analysis was used to analyze the effects of several parameters on the impeller shape,including the shape of the meridional passage,the impeller fold-angle and the slip factor.The pressure distributions and meridional velocity distributions of two impellers designed with different design variables were analyzed to predict their performance.The code used the SIMPLEC algorithm and body-fitted coordinate system to solve the Navier-Stokes equations.The results demonstrate that the shape of meridional passage and the impeller fold-angle affect the uniformity of pressure field and velocity field inside the impeller,which causes a difference of about 2% between the hydraulic efficiency of those two impellers.