Journal of Shanghai Jiaotong University ›› 2016, Vol. 50 ›› Issue (04): 575-582.

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Noise Reduction by Actively Leaning Blades in Centrifugal Pump as Turbine

DAI Cuia,DONG Liangb,KONG Fanyub,BAI Yuxingb,XIA Binb   

  1. (a. School of Energy and Power Engineering; b. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, Jiangsu, China)
  • Received:2015-03-09 Online:2016-04-28 Published:2016-04-28

Abstract: Abstract: To reduce the fluidinduced interior/exterior noise in centrifugal pump as turbine (PAT), from the relation between inphase hydrodynamic action and radiated noise, the leaned angle formula of blade in ideal condition was derived, and the noisereduction activecontrol approach was proposed, without affecting the hydraulic performance. The hydraulic performance and interior noise of two types of PATs were compared based on the experiments. After verifying the finite element model of the casing structure, the finite element method/automatically matched layer (FEM/AML) method was used to reduce the exterior noise. The results show that the leaned blade can keep the original hydraulic performance of PAT and reduce the peak value at fundamental frequency and the total sound energy. The efficiency at larger flow rates can be mostly improved by 1.09 percentage point, the Aweighted sound pressure level (OASPL) of interior noise is basically reduced by 0.07% to 3.02%, and the overall sound power of exterior noise is approximately reduced by 11.97% at 110 m3/h.

Key words: Key words: centrifugal pump as turbine (PAT), leaned blade, interior noise, exterior noise, finite element method/automatically matched layer (FEM/AML)

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