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 (27.06.2022-29.06.2022)
doi: 10.26083/tuprints-00021581
Konferenzveröffentlichung, Erstveröffentlichung, Verlagsversion
Kurzbeschreibung (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.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2022 |
| Autor(en): | Bamberger, Konrad ; Klenk, Maximilian ; Carolus, Thomas |
| Art des Eintrags: | Erstveröffentlichung |
| Titel: | A fully reversible axial fan with two contra-rotating impellers |
| Sprache: | Englisch |
| Publikationsjahr: | 2022 |
| Ort: | Darmstadt |
| Kollation: | 10 Seiten |
| Veranstaltungstitel: | FAN 2022 – International Conference on Fan Noise, Aerodynamics, Applications and Systems |
| Veranstaltungsort: | Senlis, Frankreich |
| Veranstaltungsdatum: | 27.06.2022-29.06.2022 |
| DOI: | 10.26083/tuprints-00021581 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/21581 |
| Kurzbeschreibung (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. |
| Freie Schlagworte: | reversible fan, axial, contra-rotating, optimization, multistage |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-215810 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau |
| Hinterlegungsdatum: | 29 Jul 2022 12:10 |
| Letzte Änderung: | 01 Aug 2022 05:25 |
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