The effects of the rotor-stator interaction on unsteady pressure pulsation and radial force in a centrifugal pump

• Published in: Journal of hydrodynamics. Series B Vol. 30; no. 4; pp. 672 - 681
• Main Authors: Chalghoum, Issa, Elaoud, Sami, Kanfoudi, Hatem, Akrout, Mohsen
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.08.2018; Research Laboratory "Applied Fluid Mechanics, Process and Environment Engineering", National Enginee- ring School of Sfax, Sfax, Tunisia%Research Laboratory "Laboratory of Hydraulics and Environment Modeling", National Engineering School of Tunis, ENIT, Hydraulic Engineering, Tunis, Tunisia
• Subjects: Engineering; Engineering Fluid Dynamics; Hydrology/Water Resources; Numerical and Computational Physics; Simulation; blade-tongue interaction; blade-passing frequency; Unsteady simulation; unsteady pressure distribution
• ISSN: 1001-6058; 1878-0342
• DOI: 10.1007/s42241-018-0073-y

An unsteady numerical analysis has been conducted to study the strong interaction between impeller blade and volute tongue of a centrifugal pump. The 3-D-URANS equations were solved with the shear stress transport turbulence model for a wide range of flow rates. These unsteady interactions are mostly related to the unsteady radial force due to an imbalance in the pressure field at the impeller periphery. This force represents dynamic load that are one of the most important sources of vibration and hydraulic noise. Based on this phenomenon, this work analyzes and gives a more realistic prediction of the pressure fluctuation and the radial force during steady and unsteady calculation by considering the effect of the change in the pump operating point. Actually, the pressure fluctuations in the impeller and the volute were recorded by mounting nine monitoring points on the impeller and volute casing. The results of the existing analysis has proven that the pressure fluctuation is periodic due to the relative position of impeller blade to volute tongue. The characteristics of the time domain and frequency domain of the pressure pulsation were analyzed under different coupling conditions. Fast Fourier transform was performed to obtain the spectra of pressure pulsation. Besides, the steady and unsteady forces were calculated around the impeller periphery to fully characterize the pump behavior. The obtained pump performance curves were numerically compared with the experimental ones, and the outcome have shown an acceptable agreement between both curves.