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Open AccessArticle

Numerical Investigation on the Mechanism of Double-Volute Balancing Radial Hydraulic Force on the Centrifugal Pump

Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
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Processes 2019, 7(10), 689; https://doi.org/10.3390/pr7100689
Received: 29 August 2019 / Revised: 22 September 2019 / Accepted: 29 September 2019 / Published: 2 October 2019
(This article belongs to the Section Other Topics)
Double-volute is an effective technique to reduce radial hydraulic force on the centrifugal pump and thereby mitigate the pump-casing vibration induced by unsteady flow characteristics. The mechanism of the double-volute structure balancing radial force on the impeller and volute was investigated on the basis of volute cross-sections by using Computational Fluid Dynamics (CFD) method. The tested performances and simulated inner-flow characteristics of two pumps with single-volute and double-volute were compared in this paper. The performance-test results verify the veracity of CFD method and illustrate that double-volute pump has some losses in terms of pump head and operation efficiency. The numerical simulations reveal that double-volute pump has smaller radial-force magnitude than single-volute pump on the abnormal conditions. Steady pressure field and transient pressure variations of pumps were explored to account for radial-force characteristics of double-volute pump. Compared with the single-volute structure, obvious pressure increases were found in the upper chamber (single part) of the double-volute, while the static pressure decreased in the lower chamber (double chambers). This situation reduces the pressure difference between two volute cross-sections in the collinear radial direction, resulting in smaller radial hydraulic force. Moreover, the transient simulations present the same phenomenon. The radial-forces distribute more uniformly in the double-volute pump, which can alleviate some vibrations.
Keywords: centrifugal pump; double-volute; radial hydraulic force; steady pressure distribution; transient pressure variation centrifugal pump; double-volute; radial hydraulic force; steady pressure distribution; transient pressure variation
MDPI and ACS Style

Yuan, Y.; Yuan, S.; Tang, L. Numerical Investigation on the Mechanism of Double-Volute Balancing Radial Hydraulic Force on the Centrifugal Pump. Processes 2019, 7, 689.

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