Next Article in Journal / Special Issue
Numerical Modelling of the Ice Throw from Wind Turbines
Previous Article in Journal
Parametric Study of a Turbofan Engine with an Auxiliary High-Pressure Bypass
Article Menu

Export Article

Open AccessArticle
Int. J. Turbomach. Propuls. Power 2019, 4(1), 3; https://doi.org/10.3390/ijtpp4010003

Numerical and Experimental Investigation of the 4-Quadrant Behavior of Different Mixed Flow Diffuser Pumps

Institute of Hydraulic Fluidmachinery, Graz University of Technology, Kopernikusgasse 24/IV, 8010 Graz, Austria
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in the Proceedings of the Conference on Modelling Fluid Flow (CMFF) 2018, Paper No. 59.
Received: 15 December 2018 / Revised: 20 January 2019 / Accepted: 30 January 2019 / Published: 7 February 2019
Full-Text   |   PDF [8329 KB, uploaded 7 February 2019]   |  

Abstract

Besides operating a centrifugal pump under normal conditions there are additional operating conditions possible; for example, a pump operated as turbine. Another example would be a pump trip where there are several abnormal operating conditions possible when the direction of flow and/or the direction of rotation are changing. The machine behavior in every possible operation condition can be represented by the complete pump characteristics, often called the 4-quadrant (4Q) behavior of a centrifugal pump. To gather the 4Q behavior, a test rig allowing the flow direction as well as the rotation direction to be reverted is necessary, with time-consuming measurements at variable positive and negative discharge in both directions of rotation the complete pump characteristics are evaluated. In the present study, an approach to investigate the complete pump characteristics by means of computational fluid dynamics (CFD) calculations is presented. With steady-state calculations and additional transient CFD investigations in the normal operating conditions, the whole pump characteristics were calculated accurately. Two different types of mixed flow diffuser pumps were investigated—one equipped with adjustable impeller blades, the second one with comparable low specific speed. Experimental verifications have shown a remarkably good agreement. Furthermore, an exemplary numerical waterhammer analysis shows the successful application of the presented approach. View Full-Text
Keywords: mixed flow pump; computational fluid dynamics; 4-quadrant behavior; comparison of measurement and simulation; model test; waterhammer mixed flow pump; computational fluid dynamics; 4-quadrant behavior; comparison of measurement and simulation; model test; waterhammer
Figures

Figure 1

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 (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Höller, S.; Benigni, H.; Jaberg, H. Numerical and Experimental Investigation of the 4-Quadrant Behavior of Different Mixed Flow Diffuser Pumps. Int. J. Turbomach. Propuls. Power 2019, 4, 3.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Int. J. Turbomach. Propuls. Power EISSN 2504-186X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top