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
Conference or Workshop Item, Primary publication, Publisher's Version
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Item Type: | Conference or Workshop Item |
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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 |
Abstract: | 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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