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Introduction of an Universal Scale-Up Method for the Efficiency of Axial and Centrifugal Fans

Pelz, Peter F. ; Stonjek, Stefan S. (2022):
Introduction of an Universal Scale-Up Method for the Efficiency of Axial and Centrifugal Fans. (Postprint)
In: Turbo Expo: Power for Land, Sea, and Air, In: Proceedings of ASME Turbo Expo 2014: Turbine Technical Conference and Exposition GT2014 June 16-20, 2014, Düsseldorf, Germany,
Darmstadt, ASME, ASME Turbo Expo 2014: Turbine Technical Conference and Exposition (GT2014), Düsseldorf, Germany, 16.-20.06.2014, ISBN 978-0-7918-4557-8,
DOI: 10.26083/tuprints-00020948,
[Conference or Workshop Item]

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Item Type: Conference or Workshop Item
Origin: Secondary publication service
Status: Postprint
Title: Introduction of an Universal Scale-Up Method for the Efficiency of Axial and Centrifugal Fans
Language: English
Abstract:

Acceptance tests on large fans to prove the performance (efficiency and total pressure rise) to the customer are expensive and sometimes even impossible to perform. Hence there is a need for the manufacturer to reliably predict the performance of fans from measurements on down-scaled test fans. The commonly used scale-up formulas give satisfactorily results only near the design point, where inertia losses are small in comparison to frictional losses. At part- and overload the inertia losses are dominant and the scale-up formulas used so far fail. In 2013 Pelz and Stonjek introduced a new scaling method which fullfills the demands ([1], [2]). This method considers the influence of surface roughness and geometric variations on the performance. It consists basically of two steps: Initially, the efficiency is scaled. Efficiency scaling is derived analytically from the definition of the total efficiency. With the total derivative it can be shown that the change of friction coefficient is inversely proportional to the change of efficiency of a fan. The second step is shifting the performance characteristic to a higher value of flow coefficient. It is the task of this work to improve the scaling method which was previously introduced by Pelz and Stonjek by treating the rotor/impeller and volute/stator separately. The validation of the improved scale-up method is performed with test data from two axial fans with a diameter of 1000 mm / 250mm and three centrifugal fans with 2240mm / 896mm / 224mm diameter. The predicted performance characteristics show a good agreement to test data.

Book Title: Proceedings of ASME Turbo Expo 2014: Turbine Technical Conference and Exposition GT2014 June 16-20, 2014, Düsseldorf, Germany
Series: Turbo Expo: Power for Land, Sea, and Air
Place of Publication: Darmstadt
Publisher: ASME
Collation: 11 Seiten
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 16 Department of Mechanical Engineering > Institute for Fluid Systems (FST)
Event Title: ASME Turbo Expo 2014: Turbine Technical Conference and Exposition (GT2014)
Event Location: Düsseldorf, Germany
Event Dates: 16.-20.06.2014
Date Deposited: 09 May 2022 11:05
Last Modified: 09 May 2022 11:05
DOI: 10.26083/tuprints-00020948
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-209489
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20948
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