Experimental investigation of floor-attached vortex effects on the pressure pulsation at the bottom of the axial flow pump sump. (January 2020)

• Record Type: Journal Article
• Authors: Song, Xijie; Liu, Chao
• Is Part Of: Renewable energy. Volume 145(2020)
• Page Start: 2327
• Page End: 2336
• Publication Date: 2020-01
• Subjects: axial flow pump -- Experimental investigation -- Floor-attached vortex -- Pressure distribution -- Pressure pulsation -- Theoretical analysis; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2019.07.125
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: The influence of the floor-attached vortex on the pressure pulsation at the pump sump was investigated using the experimental analysis, and the theoretical analysis according to the theory of eddy dynamics. When the floor-attached vortex appeared under the large flow rate conditions, the time-domain characteristics curves for the pressure pulsation were significantly disordered and the pressure pulsation amplitudes at different points with floor-attached vortex varied significantly. The position of the vortex was consistent with the position of the low-pressure area at the floor of the pump sump and a large pressure gradient existed at the vortex appearing area. Through the theoretical and experimental analysis, it was found that the pressure pulsation induced by the floor-attached vortex fluctuates periodically with time, and the shape of the pressure pulsation curve is approximately the cosine functional curve. Highlights: The formula of the pressure pulsation induced by floor-attached vortex (FAV) was obtained according to the Biot-Savart Law. The pressure pulsation induced by floor-attached vortex in the sump varied in the form of trigonometric function with time. The position of the floor-attached vortex was located at a low-pressure area. The main frequency of pressure pulsation with and without FAV was three times and twice of the impeller rotational frequency.