Analysis of the efficiency of balancing pistons of feed pumps

Abstract

BACKGROUND: Thermo power industry demands the high level of reliability of pump equipment. Regarding that, improvement of reliability of feed pump structure and balancing device in particular is a relevant issue.

AIMS: To perform numerical simulation of a balancing device in order to determine its optimal design and parameters. The study object is the balancing device of the PEN 290-115 feed pump

METHODS: Two types of the balancing piston, two-stage and single-stage, were studied. The series of computational fluid dynamics simulations of the three-dimensional flow of a viscous liquid were performed using the ANSYS CFX software in order to study the efficiency of given designs.

RESULTS: The calculated characteristics of the two designs of the unloading device were obtained. The influence of roughness and radial clearance on the efficiency of a cylindrical piston was studied. The simulation results showed that the radial clearance decrease leads to balancing device losses decrease. The roughness value increase may also lead to the leaks decrease, but its excessive increase leads to friction losses increase, so it is necessary to control both parameters when searching for the optimal roughness value.

CONCLUSIONS: The optimal design of the balancing piston, which combines simplicity of manufacturing, reliability and energy efficiency, is proposed.

Keywords

feed pump / balancing piston / turbulence model / equivalent roughness

References

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Funding

Министерство науки и высшего образования Российской ФедерацииMinistry of Science and Higher Education of the Russian Federation(075-11-2021-044)

RIGHTS & PERMISSIONS

Zharkovsky A.A., Zakharov A.A., Fedorov S.P.