Author(s): Nanbol Keza Bongdap; Victor Gentis; Michael Pereira; Florent Ravelet; Farid Bakir; Liza Abtroun; Loic Pora; Petar Tomov

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Abstract: This experimental study investigates the impact of dissolved gases specifically carbon dioxide (CO2) on the hydraulic performance of a centrifugal pump equipped with an inducer. Tests were conducted at constant temperature in a closed-loop test rig using both degassed water and water containing 300 ppm in mass of dissolved CO2, corresponding to the maximum solubility of the gas at 0.2 bars. The experimental setup included a transparent test section and a high-speed camera operating at 1000 Hz, allowing detailed visualization of vapor cavity dynamics under cavitating flow regimes. The results demonstrate that the presence of dissolved CO2 significantly impairs pump performance, especially at low flow rates, where head degradation occurs earlier and more gradually. In contrast, degassed water delays cavitation onset but results in a more abrupt performance drop once cavitation develops. These findings underscore the critical role of fluid quality and gas content in cavitation behavior and confirm previous observations made on the inducer-only configuration.

DOI: https://doi.org/10.1088/1755-1315/1561/1/012016

Year: 2025