Aeroacoustic Scaling of Axial Low-Pressure Fans With Leading Edge Serrations
- Previous as well as ongoing studies have shown that bioinspired modifications of the leading edge of axial fans, so-called leading edge serrations, have beneficial effects on sound radiation in rotating systems such as a broadband noise reduction. The objective of this study is to elaborate on the comparability of two geometrically similar low-pressure axial fans that differ in fan diameters. For this purpose, a fan design based on the geometric characteristics of an existing fan, which had been tested in previous studies, was developed with and without leading edge serrations at a scale of 1:3. Extensive experiments were carried out to gather detailed data on the aerodynamic and aeroacoustic performance of the specimen. Similarity laws and non-dimensional parameters are used to investigate whether a transferability comparison of the aerodynamic and aeroacoustic experimental results of these geometrically similar axial fans is possible. The latter also includes an analysis of the spectral range. The results prove that it is possiblePrevious as well as ongoing studies have shown that bioinspired modifications of the leading edge of axial fans, so-called leading edge serrations, have beneficial effects on sound radiation in rotating systems such as a broadband noise reduction. The objective of this study is to elaborate on the comparability of two geometrically similar low-pressure axial fans that differ in fan diameters. For this purpose, a fan design based on the geometric characteristics of an existing fan, which had been tested in previous studies, was developed with and without leading edge serrations at a scale of 1:3. Extensive experiments were carried out to gather detailed data on the aerodynamic and aeroacoustic performance of the specimen. Similarity laws and non-dimensional parameters are used to investigate whether a transferability comparison of the aerodynamic and aeroacoustic experimental results of these geometrically similar axial fans is possible. The latter also includes an analysis of the spectral range. The results prove that it is possible to derive a comparability of the aerodynamic parameter of the flow coefficient and thus of the flow rate of the fans. Furthermore, a correlation between the noise reduction potential of the two models can be established through spectral Strouhal number normalization. The proposed aerodynamic and aeroacoustic coherences ensure transferability from the model fan to an upscaled fan and thus allow generalized statements to accurately transfer the aeroacoustic potential of leading edge serrations for different geometrically similar fan applications.…


| Author: | Nina Maimuna Balde, Till M. BiedermannORCiD, Frank Kameier, Tobias Pohlmann |
|---|---|
| DOI: | https://doi.org/10.1115/GT2023-103181 |
| Parent Title (English): | Volume 6: Education; Electric Power; Energy Storage; Fans and Blowers |
| Publisher: | American Society of Mechanical Engineers |
| Document Type: | conference proceeding (article) |
| Language: | English |
| Date of first Publication: | 2023/09/28 |
| Reviewed: | Begutachtet/Reviewed |
| Release Date: | 2024/08/09 |
| Konferenzangabe: | ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition ; June 26–30, 2023 Boston, Massachusetts, USA |
| institutes: | Fakultät Maschinenbau und Versorgungstechnik |
| Research Themes: | Energie & Ressourcen |
