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Influence of Winglets on the Tip Vortex of Low Pressure Axial Fans

Kessler, Daniel ; Friedrichs, Jens ; Lörcher, Frieder (2022):
Influence of Winglets on the Tip Vortex of Low Pressure Axial Fans. (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-00021733,
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Item Type: Conference or Workshop Item
Status: Publisher's Version
Title: Influence of Winglets on the Tip Vortex of Low Pressure Axial Fans
Language: English
Abstract:

Low-pressure axial fans serve a wide range of applications and combine the requirements for high flow rates and low-pressure rises. Due to the low Reynolds numbers and low workload of the fluid, the design of low-pressure axial fans differs considerably from compressors in gas turbines. Yet, regulations and customer demand for high efficiency and acoustic standards. A primary goal of the ventilation and air conditioning industry and the automotive industry is to improve the fans' acoustic. Therefore, a lower overall sound power level and tonal components are necessary. One of the sources for a high sound power level is the interaction of the tip vortex with the main flow through the fan or other fan blades. The operating point essentially defines the tip vortex trajectory. Yet, the sweep and shape of the blade tip geometry can influence the bursting of the vortex and its size. The aim of this paper is the investigation of three different blade tip geometries or winglets. By using basic designs, the fundamental influence on the behavior of the tip vortex and the acoustics can be shown. Aerodynamic (including characteristic and wall pressure measurements) and acoustic studies were carried out. The results of the different blade tip geometries are compared to a well-research baseline fan. A qualitative correlation between the local design of the blade tip and the effects on the tip vortex on the one hand and the acoustics, on the other hand, could be shown. A three-dimensional design using winglets leads to a more stable and shifted vortex. A reduction of the overall sound power level in overload and at the design point is shown. Yet, in partial load, the vortex is much more diffuse, which leads to increased broadband noise.

Place of Publication: Darmstadt
Collation: 11 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: 29 Jul 2022 12:16
Last Modified: 02 Aug 2022 08:38
DOI: 10.26083/tuprints-00021733
URN: urn:nbn:de:tuda-tuprints-217336
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21733
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