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A fully reversible axial fan with two contra-rotating impellers

Bamberger, Konrad ; Klenk, Maximilian ; Carolus, Thomas (2022)
A fully reversible axial fan with two contra-rotating impellers.
FAN 2022 – International Conference on Fan Noise, Aerodynamics, Applications and Systems. Senlis, Frankreich (27.-29.06.2022)
doi: 10.26083/tuprints-00021581
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Item Type: Conference or Workshop Item
Type of entry: Primary publication
Title: A fully reversible axial fan with two contra-rotating impellers
Language: English
Date: 2022
Place of Publication: Darmstadt
Collation: 10 Seiten
Event Title: FAN 2022 – International Conference on Fan Noise, Aerodynamics, Applications and Systems
Event Location: Senlis, Frankreich
Event Dates: 27.-29.06.2022
DOI: 10.26083/tuprints-00021581

The objective of this paper is the design, manufacture and test of a fully reversible axial fan. The fundamental layout of the fan chosen consists of two identical contra-rotating impellers without guide vanes, placed in mirror image to each other in a duct-type housing. Given a fixed flow coefficient, a CFD-based optimization method is utilized to find the pressure rise coeffi-cient, the rotational speed ratio of both impellers and the spanwise distributions of blade chord length and stagger angle that promise maximum total-to-static efficiency of the fully reversible fan. As a result, the impeller blades are composed of thin non-cambered airfoil elements, fully symmetric to the stagger line. They are twisted. The predicted optimal rotational speed of the downstream impeller is 82.5 % of the upstream impeller. For the design flow coefficient Φ = 0.10 the optimal total-to-static pressure rise coefficient is Ψts = 0.5. These are typical values for a high pressure axial fan. For experimental validation two 80 mm diameter impellers were man-ufactured via 3D printing and mounted in a precision aluminum tube via three circular struts. The measured performance characteristics for a range of the impeller speed ratio confirm the prediction fairly well. The best total-to-static efficiency performance corresponds to a fan exit flow without swirl, which is achieved around the optimal rotational speed ratio of 0.825 to 1.0.

Uncontrolled Keywords: reversible fan, axial, contra-rotating, optimization, multistage
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-215810
Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 16 Department of Mechanical Engineering
Date Deposited: 29 Jul 2022 12:10
Last Modified: 05 Jun 2023 12:19
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21581
PPN: 499051122
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