Non-Dimensional Parametric Optimisation of Hydraulic Performance of Centrifugal Pump using Response Surface Analysis

In this study, the hydraulic performance of a single-stage centrifugal pump at the rated point was enhanced using the response surface methodology (RSM). By establishing an approximate relationship between the design head coefficient and flow coefficient, key geometric variables such as the number of blades, flow rate, and rotation were selected as decision variables. The head and flow coefficients were considered as responses. Utilising a central composite design (CCD) and computational fluid dynamics (CFD) in Design-Expert software, optimised impeller designs were evaluated. Experimental validation through 20 tests showed an average error of 6.21% for head, 5.77% for efficiency, and 7.13% for output power. The optimised pump model, featuring 7 blades, operating at 1,900 rpm, and delivering 450 m3/h, resulted in a head coefficient improvement of 5.42% and a flow coefficient improvement of 7.45%.