Relationship Between Unsteady Flow, Pressure Fluctuations, and Noise in a Centrifugal Pump—Part A: Use of PDV Data to Compute the Pressure Field
Relationship Between Unsteady Flow, Pressure Fluctuations, and Noise in a Centrifugal Pump—Part A: Use of PDV Data to Compute the Pressure Field
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DOI：
10.1115/1.2816813
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发表时间：
1995-03
影响因子：
2
通讯作者：
S. Chu;R. Dong;J. Katz
中科院分区：
文献类型：
--
作者：
S. Chu;R. Dong;J. Katz
本文利用质点位移测速法测得的速度分布计算了离心泵蜗壳内的压力场。结果表明，叶片舌相互作用和不均匀的从叶轮的出流是主要的贡献者，当地的压力波动和远场噪声。因此，叶轮和舌部之间的空间的略微增加导致流动结构的显著变化和所产生的噪声的降低。只要舌片-叶轮间隙小于叶轮半径的20%，则影响是显著的。它还表明，涡量分布，特别是大涡列与射流/尾流现象，占主导地位的总压的变化。因此，势流模型不太可能提供流动结构的任何真实描述
Velocity distributions determined by using Particle Displacement Velocimetry are used for computing the pressure field within the volute of a centrifugal pump. It is shown that blade-tongue interactions and nonuniform outflux from the impeller are primary contributors to local pressure fluctuations and far field noise. Consequently, a slight increase in the space between the impeller and the tongue causes significant changes in flow structure and reductions in the resulting noise. The impact is significant as long as the tongue-impeller gap is less than 20 percent of the impeller radius. It is also shown that the vorticity distributions, particularly the large vortex trains associated with the jet/wake phenomenon, dominate variations in the total pressure. Thus, it is unlikely that a potential flow model can provide any realistic description of the flow structure