TU Darmstadt / ULB / TUprints

Axial Impeller-only Fans with Optimal Hub-to-tip Ratio and Adapted Blades

Carolus, Thomas ; Bamberger, Konrad (2022):
Axial Impeller-only Fans with Optimal Hub-to-tip Ratio and Adapted Blades. (Publisher's Version)
Darmstadt, FAN 2022 – International Conference on Fan Noise, Aerodynamics, Applications and Systems, Senlis, Frankreich, 27.06.-29.06.2022, DOI: 10.26083/tuprints-00021734,
[Conference or Workshop Item]

[img] Text
fp-134-CAROLUS.pdf
Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

Download (3MB)
Item Type: Conference or Workshop Item
Status: Publisher's Version
Title: Axial Impeller-only Fans with Optimal Hub-to-tip Ratio and Adapted Blades
Language: English
Abstract:

This study targets at determining impeller-only axial fans with optimal hub-to-tip ratio for highest achievable total-to-static efficiency. Differently from other studies, a holistic approach is chosen. Firstly, the complete class of this fans is considered. Secondly, the radial distribution of blade sweep angle, stagger angle, chord length and blade camber are varied to adapt the blades to the complex flow in the hub- and tip region. The tool being used is an optimization scheme with three key components: (i) a database created beforehand by Reynolds-Averaged Navier-Stockes (RANS-) predicted performance characteristics of 14,000 designs, (ii) an artificial neural network as a metamodel for the fan performance as a function of 26 geometrical parameters., (iii) an evolutionary algorithm for optimization, performed with the metamodel. In general, the hub-to-tip ratios for the class of axial impeller-only fans proposed by the optimization scheme are smaller than those obtained applying the classic rules. A second outcome are the shapes of adapted blades which deviate substantially from the classic and even the state-of-the-art "swept-only'' or "swept with dihydral'' design. Chord length, stagger and sweep angle are distributed from hub to tip in a complex manner. The inherent reason is that the scheme tries to minimize not only the dynamic exit loss but also frictional losses due to secondary flows in the hub and tip region which eventually results in the maximum achievable total-to-static efficiency.

Place of Publication: Darmstadt
Collation: 10 Seiten
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 16 Department of Mechanical Engineering
Event Title: FAN 2022 – International Conference on Fan Noise, Aerodynamics, Applications and Systems
Event Location: Senlis, Frankreich
Event Dates: 27.06.-29.06.2022
Date Deposited: 05 Aug 2022 12:10
Last Modified: 05 Aug 2022 12:10
DOI: 10.26083/tuprints-00021734
URN: urn:nbn:de:tuda-tuprints-217344
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21734
PPN:
Export:
Actions (login required)
View Item View Item