Comparative analysis of pressure pulsations in designs of the tubular guide channels of the LRE screw centrifugal pump

Аuthors

Klimenko D. V.^1*, Timushev S. F.^1**, Korchinskiy V. V.^2***

1. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
2. NPO Energomash named after academician V.P. Glushko, 1, Burdenko str., Khimki, 141400, Russia

*e-mail: srmitriy@gmail.com
**e-mail: TimushevSF@mai.ru
***e-mail: korvv50@gmail.com

Abstract

An important task is to improve the LRE feed system turbopump vibration reliability. The most powerful source of vibration are high-speed screw centrifugal pumps. In the spectra of pressure pulsations, vibrations and dynamic deformation of the screw centrifugal pump casing dominate tonal components at the blade passing frequency and their higher harmonics. These fluctuations are due to unsteady hydrodynamic interaction non-uniform flow outgoing the centrifugal impeller with guide vane channels. Application of tubular guide channels allows smoothing the pressure pulse of the rotor blade passage, reducing the amplitude of the pressure pulsations and vibrations and significantly improving the dynamic strength of the structure. The mechanism of reduction of pressure pulsations and vibration of the pump casing when using tubular channels guide unit revealed. The numerical simulation of unsteady flow in the pump is undertaken to assess the designs and provide further optimization. Numerical analysis was performed using the method of «sliding grids». The calculation results and comparative analysis of variants of the guiding unit of the high-speed screw centrifugal pump outlined. In the computational experiments identified signals and spectra of pressure pulsations at different points of the pump outlet path, energy parameters and energy loss in the pump outlet path.

Keywords:

srew-centrifugal pump, tubular guide channels, pressure pulsations, blade passing frequency

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