ABSTRACT Unsteady radial forces in side channel pumps (SCPs) can compromise impeller stability and reduce pump lifespan, yet the impact of blade tip cutting angle (TCA) on these forces remains unclearly characterized. This paper applied Computational Fluid Dynamics (CFD) using the Finite Volume Method (FVM) to investigate the correlation among blade TCAs, internal flow structures and radial force (RF) in SCPs. The following are the two key objectives of the study: first, a quantitative investigation of the flow patterns and RF distribution at varying TCAs (10°, 20°, 30°, 40°, and 50°); second, to understand the underlying processes that result in the observed variation in RFs. The tip of the blade cut exemplifies a noticeable presence in the RF propagations across various operating points in SCP. The RF level is excessive under part‐load conditions, constant at design conditions and lower under overload conditions. The mean optimum RF measures 491.2 N; under the flow rate of 0.8 Q d , 398.6 N; under the flow rate of 1.0 Q d , and 227.334 N; under the flow rate of 1.2 Q d , for all TCAs. The maximum RF strength increases proportionally to an increase in the cutting angle between 10° to 30°. Nonetheless, the RF potency decreases at a cutting angle of 40° before peaking at 50°. On the whole, a cutting angle of 10° yields the highest RF magnitude at 106° in part‐load conditions, and a cutting angle of 40° yields the lowest RF at 136° in overload conditions, compared to other TCAs. These findings highlight the critical interplay between impeller geometry and radial forces, providing actionable insights for optimizing blade tip design that minimize unsteady forces, reduce vibration, and improve operational stability in pumps.
Adu‐Poku et al. (Thu,) studied this question.
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