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Mathematical Problems in Engineering
Volume 2014, Article ID 436473, 8 pages
http://dx.doi.org/10.1155/2014/436473
Research Article

Numerical Investigation on a Prototype Centrifugal Pump Subjected to Fluctuating Rotational Speed

1College of Mechanical Engineering, Quzhou University, Quzhou 324000, China
2Quzhou College of Technology, Quzhou 324000, China

Received 26 February 2014; Accepted 30 April 2014; Published 26 June 2014

Academic Editor: Hua-Shu Dou

Copyright © 2014 Yu-Liang Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The rotational speed of pumps often encounters fluctuation in engineering for some reasons. In this paper, in order to study the transient response characteristic of a prototype centrifugal pump subjected to fluctuating rotational speed, a closed-loop pipe system including the pump is built to accomplish unsteady flow calculations in which the boundary conditions at the inlet and the outlet of the pump are not required to be set. The external performance results show that the head’s responsiveness to the fluctuating rotational speed is very good, while the flow rate’s responsiveness is slightly delayed. The variation tendencies of the static pressures at the inlet and the outlet of the pump are almost completely opposite, wherein the variation tendency of the static pressure at the outlet is identical with that of the rotational speed. The intensity of the turbulence energy in each impeller channel is relatively uniform in the transient flow calculations, while, in the quasi-steady flow calculation, it becomes weaker in a channel closed to the volute tongue. The nondimensional flow rate and head coefficients are dependent on the rotational speed, and their variation tendencies are opposite to that of the fluctuating rotational speed as a whole.