Research Information System
Measurement: Journal of the International Measurement Confederation, vol.254, 2025 (SCI-Expanded, Scopus)
Pump systems consume a significant portion of global electrical energy, with usage in certain industries reaching 25–50 %. Efficient system design and suitable pump selection can reduce energy consumption. Techniques such as variable flow rate pumps, impeller trimming, and splitter blades enhance efficiency. This study focuses on the effects of impeller trimming on the characteristic curves Hm = f(Q), Ps = f(Q), and ηp = f(Q) of a submersible pump with a blade discharge angle β2b = 30° and z = 5 blades. Experimental results indicate that reducing the impeller outlet diameter by 2 % increases total efficiency at the Best Efficiency Point (BEP) by 3.46 %. Additionally, characteristic values predicted by the Gene Expression Programming (GEP) model closely matched experimental data, with high R2 values (above 0.99) and acceptable error percentages. Statistical analysis confirmed the GEP model's high accuracy in predicting pump characteristics across impeller diameter variations. These findings demonstrate that impeller trimming, combined with GEP modeling, is an effective energy-saving approach in pump systems.