Analyses of the transient turbulence flow in a 3D impeller axial pump using Novel vibration signals and Inner dynamic simulation techniques

Abstract

This research examines the influence of transient flow conditions on the relative flow channel between the surrounding flow field and impeller, highlighting their contribution to pulsation phenomena and the unstable performance frequently seen in axial flow pumps. To ensure the accuracy of results, both numerical and experimental simulations were validated through physical model testing. The study primarily investigates the pressure pulsation characteristics and impeller flow field at various flow rates and blade angles (3° to −3°) with various distinct operating conditions. Findings reveal that as the flow rate decreases, the axial pump's stability diminishes, leading to heightened pressure pulsations in several regions of the flow field. Additionally, adjusting the blade angle between −3° and 3° results in increased flow instability, higher pressure pulsation levels, and more frequent rotor-stator interactions. These insights contribute to a deeper understanding of how flow dynamics and blade geometry affect the performance and stability of axial flow pumps. particularly in zones where the flow is already unstable. The highest levels of pulsations were observed in the distributor components, with a strong correlation to the blade angle amplitude of the impeller. This research provides significant insights into the underlying mechanisms of flow dynamics in axial pumps and offers a foundation for optimizing and improving pump stability and design. These findings will benefit scientists and engineers by advancing the understanding of pump flow behavior and informing future studies on axial pump turbines under various operating conditions.