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

Abstract

Application of tubular guide channels allows to smooth the pressure pulse due to the rotor blade passage, reduce the amplitude of pressure pulsations and vibra- tions, as well as significantly improve the dynamic strength of the structure. The mechanism of reduction of pressure fluctuations and vibration of the pump cas- ing when using tubular channels guide unit is explained. Urgent problem is the numerical simulation of unsteady flow in the pump outlets to assess options and make their optimization. Computational analysis was performed using the meth- od of "sliding grid". The calculation results and comparative analysis of variants of the guiding unit of the high-speed screw centrifugal pump are outlined. In the computational experiments are determined signals and spectra of pressure pulsa- tions at different points of the pump outlet path, energy parameters and energy loss in the pump outlet path.