Unsteady Flow Structure on a Centrifugal Pump: Experimental and Numerical Approaches
Unsteady Flow Structure on a Centrifugal Pump: Experimental and Numerical Approaches
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DOI：
10.1115/fedsm2002-31182
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发表时间：
2002
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影响因子：
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通讯作者：
J. González;C. Santolaria;E. Blanco;Joaquín Fernandez
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文献类型：
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作者：
J. González;C. Santolaria;E. Blanco;Joaquín Fernandez
本文对离心泵内部的非定常压力场进行了实验和数值研究。本文将对压力波动的非定常模式进行比较，并从数值模型中进行更深入、更详细的流动研究。用安装在蜗壳盖上的压力传感器进行测量。同时，利用有限体积商业程序对离心泵蜗壳内的非定常压力场进行了数值模拟，并将所得动态变量与实验数据进行了比较。特别是，在叶片通过频率的蜗壳的围带侧壁中的脉动压力场的振幅被成功地捕获的模型为广泛的操作流量。一旦开发的数值模型已经显示出它的能力，在描述不稳定的模式实验测量，这种模式的解释进行搜索。此外，数值模型的可能性可以扩展到其他部分（除了蜗壳的围壁），这可以提供合理的解释叶轮出口处的流动和蜗壳舌在不同的轴向位置之间的动态相互作用的影响。数值模拟的结果集中在叶片通过频率上，以研究在给定位置在该频率下发生的两个主要现象的相对影响：叶片通过舌部前面和叶片尾流。Copyright © 2002 by ASME
Both experimental and numerical studies of the unsteady pressure field inside a centrifugal pump have been carried out. The unsteady patterns found for the pressure fluctuations are compared and a further and more detailed flow study from the numerical model developed will be presented in this paper. Measurements were carried out with pressure transducers installed on the volute shroud. At the same time, the unsteady pressure field inside the volute of a centrifugal pump has been numerically modelled using a finite volume commercial code and the dynamic variables obtained have been compared with the experimental data available. In particular, the amplitude of the fluctuating pressure field in the shroud side wall of the volute at the blade passing frequency is successfully captured by the model for a wide range of operating flow rates. Once the developed numerical model has shown its capability in describing the unsteady patterns experimentally measured, an explanation for such patterns is searched. Moreover, the possibilities of the numerical model can be extended to other sections (besides the shroud wall of the volute), which can provide plausible explanations for the dynamic interaction effects between the flow at the impeller exit and the volute tongue at different axial positions. The results of the numerical simulation are focused in the blade passing frequency in order to study the relative effect of the two main phenomena occurring at that frequency for a given position: the blade passing in front of the tongue and the wakes of the blades.Copyright © 2002 by ASME