Low specific speed centrifugal pumps exhibit narrow and long impeller flow channels that induce internal flow instability, leading to pump oscillation, noise, and inefficiency. Splitter blades serve as an effective optimization method for such pumps. This study combines experimental and numerical approaches to investigate the spatiotemporal flow evolution in splitter blade sub-channels, identifying instability mechanisms at the leading edge, midsection, and trailing edge of the blade. Results demonstrate higher flow rates in the pressure side sub-channels compared to the suction side ones. Pressure pulsation is primarily governed by the jet-wake structure and rotor–stator interaction at flow channel outlets. Analysis of liquid flow angle, turbulence kinetic energy, and eddy viscosity distribution establishes correlations between high turbulence areas and the frequent occurrence of phenomena such as vortices and flow separation.
Li et al. (Mon,) studied this question.
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