Transient Behavior of Turbomachineries: Applications to Radial Flow Pump Startups

[+] Author and Article Information
Antoine Dazin

 Laboratoire de Mécanique de Lille-UMR CNRS 8107, Ecole Nationale Supérieure des Arts et Métiers 8, Boulevard Louis XIV, 59046 Lille Cedex, Franceantoine.dazin@lille.ensam.fr

Guy Caignaert, Gérard Bois

 Laboratoire de Mécanique de Lille-UMR CNRS 8107, Ecole Nationale Supérieure des Arts et Métiers 8, Boulevard Louis XIV, 59046 Lille Cedex, France

J. Fluids Eng 129(11), 1436-1444 (Apr 13, 2007) (9 pages) doi:10.1115/1.2776963 History: Received April 14, 2006; Revised April 13, 2007

A theoretical analysis of the fast transients of turbomachineries, based on the study of unsteady and incompressible fluids mechanics equations applied to an impeller, is proposed. It leads to internal torque, internal power, and impeller head of an impeller during transient periods. The equations show that the behavior of a pump impeller is not only depending on the acceleration rate and flow rate, as it is usually admitted, but also on velocity profiles and their evolution during the transient. Some hypotheses on the flow in a radial flow pump are proposed. They are validated by comparison with the experimental results of a single stage, single volute radial flow pump during some fast acceleration periods. The model is also used to analyze the behavior of the pump during a fast startup.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Velocity triangle

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Figure 2

Definition of the control volume

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Figure 3

Experimental setup

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Figure 4

Schematic view of the impeller

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Figure 5

Magnetic sensor implementation (a) and response (b)

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Figure 6

Evolution of pressure at the inlet and the outlet of the pump (a); evolution of the flow rate (b)

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Figure 7

(a) Evolution (H,Qv) during a fast startup; (b) nondimensional evolution (ϕ,ψ) during a fast startup; experimental conditions 1.

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Figure 9

Comparison between experimental and model results

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Figure 10

Evolution of the steady, angular acceleration terms as a function of the flow rate; (a) experimental conditions 1; (b) experimental conditions 4.

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Figure 11

(a) Evolution of the total and steady pressure coefficient, rotation speed, and flow rate with time; (b) evolution of the pressure coefficient with the flow coefficient; experimental conditions 1




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