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Influence of Compressibility on Fan Efficiency and Fan Efficiency Scaling

Saul, Sebastian ; Pelz, Peter F. (2022):
Influence of Compressibility on Fan Efficiency and Fan Efficiency Scaling. (Postprint)
In: Pumps + Systems. Compressors, Compressed Air and Vacuum Technology,
Darmstadt, VDMA, 3rd International Rotating Equipment Conference (IREC) Pumps, Compressors and Vacuum Technology 2016, Duesseldorf, Germany, Duesseldorf, Germany, 14.–15.09.2016, ISBN 978-3-8163-0697-9,
DOI: 10.26083/tuprints-00021188,
[Conference or Workshop Item]

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Item Type: Conference or Workshop Item
Origin: Secondary publication service
Status: Postprint
Title: Influence of Compressibility on Fan Efficiency and Fan Efficiency Scaling
Language: English
Abstract:

The similarity of Reynolds and Mach number for model and full scale fan cannot be retained for the dimensioning of large industrial fans. Scaling is supposed to compensate these differences in efficiency determination. The present paper indicates the influence of compressibility, e. g. the Mach number on efficiency and efficiency scaling of fans. The research is focused on experimental investigations and the use of common scaling laws proposed by Ackeret [1] and Pelz/Stonjek [2]. The investigations were done at the laboratories of the Chair of Fluid Systems at the Technische Universität Darmstadt, Germany. A centrifugal fan with the specific speed σ = 0.114 was chosen because of its high pressure rise and high operating Mach number. As expected, the results show an increase in maximum efficiency by increasing Reynolds and Mach number up to ܽMa < 0.3. If the Reynolds and Mach number are increased further, the maximum efficiency stagnates and decreases for Mach numbers above ܽMa > 0.4. Both mentioned scaling laws consider the variation of Reynolds number, but none of them consider the effects of a change in Mach number. But a change in Mach number affects the friction losses, Carnot losses and incidence losses, which are discussed for the present fan as well.

Book Title: Pumps + Systems. Compressors, Compressed Air and Vacuum Technology
Place of Publication: Darmstadt
Publisher: VDMA
Collation: 12 Seiten
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 16 Department of Mechanical Engineering > Institute for Fluid Systems (FST)
Event Title: 3rd International Rotating Equipment Conference (IREC) Pumps, Compressors and Vacuum Technology 2016, Duesseldorf, Germany
Event Location: Duesseldorf, Germany
Event Dates: 14.–15.09.2016
Date Deposited: 11 May 2022 14:07
Last Modified: 11 May 2022 14:07
DOI: 10.26083/tuprints-00021188
URN: urn:nbn:de:tuda-tuprints-211880
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21188
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