Numerical Study on the Characteristics of Pressure Fluctuations in an Axial-Flow Water Pump

Abstract

Flow induced vibration due to the dynamics of rotor-stator interaction in an axial-flow pump is one of the most damaging vibration sources to the pump components, attached pipelines, and equipment. Three-dimensional unsteady numerical simulations were conducted on the complex turbulent flow field in an axial-flow water pump, in order to investigate the flow induced vibration problem. The shear stress transport (SST) -model was employed in the numerical simulations. The fast Fourier transform technique was adopted to process the obtained fluctuating pressure signals. The characteristics of pressure fluctuations acting on the impeller were then investigated. The spectra of pressure fluctuations were predicted. The dominant frequencies at the locations of impeller inlet, impeller outlet, and impeller blade surface are all 198 Hz (4 times of the rotation frequency 49.5 Hz), which indicates that the dominant frequency is in good agreement with the blade passing frequency (BPF). The first BPF dominates the frequency spectrum for all monitoring locations inside the pump.

Numerical analysis of pressure fluctuation in a multiphase rotodynamic pump with air–water two-phase flow

“…However, for gas-liquid two-phase pumps, the flow is usually more disordered due to the phase interaction between the two phases effecting the fluctuation in such pumps (Liu et al, 2017a;Ma et al, 2018;Yu et al, 2014). Many studies on the pressure fluctuation in single-phase pumps have been conducted or even carried out in-depth cavitation analysis in recent years, including for centrifugal pumps (González et al, 2006;Liu et al, 2017b;Majidi, 2005), axial flow pumps (Feng et al, 2016;Shuai et al, 2014;Xie et al, 2018) and mixed-flow pumps (Miyabe et al, 2006;Xu et al, 2017;Zhang et al, 2017b). González et al (2006) investigated pressure fluctuation and radial forces for a centrifugal pump with an impeller to tongue gap variation and obtained the dynamic forces at the blade passing frequency.…”

Analysis of Centroid Trajectory Characteristics of Axial-Flow Pump Impeller Under Hydraulic Excitation

“…The three-dimensional unsteady numerical simulation of complex turbulent flow field in axial flow pump is carried out. The results show that the dominant frequency is in good agreement with the blade passing frequency (Shuai et al, 2014). Simulation of the flow rate of three pumps with different number of blades shows that the blade passing frequency and its harmonics dominate the pressure fluctuation spectrum (Kang et al, 2015).…”

Studies on Flow Characteristics of Gas–Liquid Multiphase Pumps Applied in Petroleum Transportation Engineering—A Review

“…The pressure fluctuation in various types of single-phase pumps, such as centrifugal [87][88][89], axial flow [90][91][92] and mixed flow [93][94][95], has been investigated thoroughly. The relevant research results show that the rotor-stator interaction is the key factor to produce pressure fluctuation in the single-phase flow pump.…”