Investigation of the correlation between noise & vibration characteristics and unsteady flow in a circulator pump

Circulator pumps have wide engineering applications but the acoustics, vibration and unsteady flow structures of the circulator pump are still not fully understood. We investigated the noise and vibration characteristics and unsteady flow structures in a circulator pump at different flow rates. Three-dimensional, unsteady RANS equations were solved on high-quality structured meshes with SST k-ω turbulence model numerically. Measurements were made in a semi-anechoic chamber to get an overview of noise and vibration level of a pump at different flow rates. The 1/3 octave-band filter technique was applied to obtain the explicit frequency spectra of sound, pressure fluctuations and vibration signals and their principal frequencies were identified successfully. The air-borne noise level of the designed condition is lower than that of the off-design conditions, and the highest sound pressure level is found at part-load condition. The acoustic emission from the pump is mainly caused by unsteady flow structures and pressure fluctuations. In addition, both the link between airborne noise and pressure fluctuation, and the correlation between vibration and unsteady hydrodynamic forces, were quantitatively examined and verified. This work offers good data to understand noise and vibration characteristics of circulator pumps and the relationships among the noise, vibration and unsteady flow structures.

[1]  I. Hayashi,et al.  Pressure pulsations in piping system excited by a centrifugal turbomachinery taking the damping characteristics into consideration , 2014 .

[2]  Joseph Katz,et al.  Effect of Modification to Tongue and Impeller Geometry on Unsteady Flow, Pressure Fluctuations, and Noise in a Centrifugal Pump , 1997 .

[3]  R. Spence,et al.  Investigation into pressure pulsations in a centrifugal pump using numerical methods supported by industrial tests , 2008 .

[4]  Joaquín Fernández,et al.  Estimation of radial load in centrifugal pumps using computational fluid dynamics , 2011 .

[6]  Mikael A. Langthjem,et al.  A numerical study of flow-induced noise in a two-dimensional centrifugal pump. Part II. Hydroacoustics , 2004 .

[7]  U. Bolleter,et al.  Pressure pulsations in centrifugal pumps , 1992 .

[8]  Jorge Parrondo,et al.  A simple acoustic model to characterize the internal low frequency sound field in centrifugal pumps , 2011 .

[9]  Thomas Staubli,et al.  The Unsteady Pressure Field in a High Specific Speed Centrifugal Pump Impeller— Part I: Influence of the Volute , 1999 .

[10]  Joaquin Fernandez-Francos,et al.  The Effect of the Operating Point on the Pressure Fluctuations at the Blade Passage Frequency in the Volute of a Centrifugal Pump , 2002 .

[11]  T. Carolus,et al.  Experimental and Numerical Investigation of the Unsteady Flow Field and Tone Generation in an Isolated Centrifugal Fan Impeller , 2010 .

[12]  Xiaohua Zhou,et al.  Experimental research on pressure fluctuation and vibration in a mixed flow pump , 2016 .

[13]  Dennis K. McLaughlin,et al.  Experiments on the unsteady flow field and noise generation in a centrifugal pump impeller , 2003 .

[14]  Joseph Katz,et al.  Relationship Between Unsteady Flow, Pressure Fluctuations, and Noise in a Centrifugal Pump—Part B: Effects of Blade-Tongue Interactions , 1995 .

[15]  Jorge Parrondo,et al.  Numerical analysis of the unsteady flow in the near-tongue region in a volute-type centrifugal pump for different operating points , 2010 .

[16]  Stefan Becker,et al.  Effect of blade wrap angle on efficiency and noise of small radial fan impellers—A computational and experimental study , 2012 .

[17]  N. Qi,et al.  Circulation pumps as structure-borne sound sources: emission to finite pipe systems , 2003 .

[18]  Chisachi Kato,et al.  Quantitative evaluation of flow-induced structural vibration and noise in turbomachinery by full-scale weakly coupled simulation , 2007 .

[19]  Joseph Katz,et al.  Relationship Between Unsteady Flow, Pressure Fluctuations, and Noise in a Centrifugal Pump—Part A: Use of PDV Data to Compute the Pressure Field , 1995 .

[20]  Luc Mongeau,et al.  A method for characterizing aerodynamic sound sources in turbomachines , 1995 .