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Numerical Prediction of Pump Performance Drop and Erosion Area due to Cavitation in a Double-Suction Centrifugal Feedpump

[+] Author Affiliations
Masahiro Miyabe, Hideaki Maeda

Torishima Pump Mfg. Co., Ltd., Takatsuki, Osaka, Japan

Paper No. AJK2011-06023, pp. 121-128; 8 pages
doi:10.1115/AJK2011-06023
From:
  • ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
  • ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D
  • Hamamatsu, Japan, July 24–29, 2011
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4440-3
  • Copyright © 2011 by ASME

abstract

This paper presents the numerical cavitatoin prediction methods of pump performance drop and erosion area by using a commercial CFD code. A cavitation model which is so called full cavitation model was used to predict pump performance drop. Furthermore, some indexes which are associated with void fraction and static pressure rising were applied to estimate erosion area on the impeller blades. A centrifugal boiler feedpump with a double-suction was tested and the cavitation characteristics were visualized and compared with the calculated results at three pump operating points of 0.63Qopt , Qopt and 1.50Qopt , respectively. As a result, the calculated pump performance drop and cavitation behavior agree well qualitatively with the experimental ones. Based on the calculation results of partial flow rate, it was found that pump performance drop is caused when the cavity reaches the blade-to-blade throat at the hub-side and the decrease of blade loading at the impeller outlet. In addition, simple cavitatoin erosion indexes were applied to esitimate the erosion area. The paint erosion test was conducted and compared with the calculated results at three pump operating points. One of them is in good agreement with the experiment. It is concluded that the present numerical cavitation prediction method is available at a design process of the pump.

Copyright © 2011 by ASME

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