Abstract
The pulse water jet pump is widely used for many industrial purposes owing to the presence of pressure fluctuations that can considerably improve the erosive action of a jet. However, literature regarding the cavitating water jet flow patterns and underlaying mass transfer mechanisms remains relatively scarce due to existing measurement obstacles. To reveal underlying relationships between pump geometrical configuration and its performance, this study presents an experimental and numerical investigation of a self-excited oscillation water jet pump. Firstly, an experimental rig was built, and the performance of the pump was assessed against various operating conditions. Then, a numerical model based on the same pump geometry and operation conditions was developed to provide detailed predictions of the internal cavitating flow patterns. Reasonably good agreements were found between the numerical predictions and experimental measurements, which indicate that the developed numerical model can accurately predict the flow entrainment process in the self-excited oscillation pulse jet pump. Internal cavitating flow patterns in terms of streamlines, pressure contours, and velocity profiles were explored for different pump geometric configurations by adjusting the nozzle-throat distance. Relationships between these influential factors and pump mixing capacity were provided. This paper presents an in-depth understanding of the self-excited oscillation pulse water jet and systematically explores the impacts of pump geometries and operating conditions on its performance.
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