Study on Flow Control and Noise Reduction of Jet-type Centrifugal Pump based on Non-smooth Surface Structure

Abstract

Jet-type centrifugal pumps are widely used in daily water supply systems due to their excellent self-priming capabilities; however, their complex internal flow patterns can negatively affect performance and generate high noise levels. In this study, inspired by the physiological structure of the mantis shrimp, circular non-smooth surface structures (NSSS) were introduced at various locations within the jet throat, and numerical simulations were conducted using a geometric model of the pump body to optimize flow stability while achieving the dual goals of improving efficiency and reducing noise. The results indicate that introducing the NSSS effectively enhances flow stability within the pump, particularly at the front, middle, and rear sections of the throat. The pressure within the pump increased significantly, while turbulence intensity and energy loss were notably reduced, resulting in a 2.79% improvement in hydraulic efficiency. Additionally, the amplitude of broadband noise decreased by 13.04% at the front section of the throat. Further analysis revealed that the application of the NSSS not only reduced the internal noise levels but also shifted the high-noise regions, particularly within the injector’s throat area. These findings highlight the significant potential of NSSS for noise control and flow optimization in jet-type centrifugal pumps.

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