Research on hydrodynamics of high velocity regions in a water-jet pump based on experimental and numerical calculations at different cavitation conditions

Abstract

Cavitation is a common phenomenon and continues to be a primary concern in the fields of hydraulic machinery. To provide a reference for cavitation flow and cavitation performance improvement, this paper presents the experimental study on the cavitation flow structures of the water-jet pump. High-speed photography technology is used to capture the cavitation flow structures and reveal the physical process of cavitation evolution in the water-jet pump. Cavitation–vortex interaction was further explored by numerical simulations. By extracting 24 m/s water velocity isosurface and analyzing the water superficial velocity on the isosurface, the flow characteristics in the high-velocity fluid area under different cavitation stages are revealed. Then, by analyzing the vortex structure on the isosurface, the main factors affecting the development of the vortex structure on the high-velocity fluid area are summarized.

Effect of the arrangement of cavitation generation unit on the performance of an advanced rotational hydrodynamic cavitation reactor

“…HC is intentionally produced by a hydrodynamic cavitation reactor (HCR), therefore, its structure generally determines the cavitation intensity and consequent treatment effectiveness of HC technology, indicating the importance of designing high-performance HCRs [28] , [29] , [30] . Recently, the advanced rotational HCRs (ARHCRs), which possess different structures and generation mechanisms from the popular conventional HCRs (e.g., Venturi, orifice, and vortex diode), have attracted increasing attention from the academic and industrial communities, due to high treatment effectiveness and process rate [31] , [32] . Some ARHCRs with fine design can be operated in a continuous mode for biodiesel production [23] , [33] , [34] , microbial inactivation of milk [35] , [36] , and pretreatment of lignocellulose biomass (e.g., commercialized products from BioBANG company), demonstrating great potential for industrial-scale applications.…”

Study on the experiment and numerical simulation of cavitation flow mechanisms at different flow rates in water-jet propulsion pumps

“…The cloud-like cavitation that breaks up with the main cavitation appears in the triangular area and rolls vertically with the main flow cavitation, and the vortex enters. tip clearance [11]. At this time, the tip cavitation and shedding cloud-like cavitation block the tip flow channel on a large scale, causing strong flow separation on the blade surface.…”

“…By extracting the 24m/s water pace isosurface and examining the water floor pace on the isovalue surface, the group printed the float traits of the high-velocity fluid sector underneath one of a kind cavitation stages. Through the evaluation of the equal floor vortex structure, the foremost elements that have an effect on the improvement of the vortex shape in the high-velocity fluid place are summarized [11]. Then the group simulated the cavitation traits of the impeller tip clearance leakage float and tip leakage vortex beneath distinct cavitation conditions.…”

Study on cavitation flow and high-speed vortex interference mechanism of high-speed inducer centrifugal pump based on full flow channel

“…The cavitation flow in the inducer is interfered by the tip clearance and the highspeed flow in the flow channel, and its interaction mechanism still needs further study. Long Yun [43][44][45] proposed an analysis method of tip clearance flow and high-speed mainstream interference mechanism for cavitation flow of water jet pump impeller. This section will use this method to explore the interference mechanism between cavitation zone and high-speed zone of high-speed centrifugal pump.…”