Statistical Modelling of Aerofoil Self-Noise Subjected to Structured Porous Trailing Edges
- Extensive research efforts in the aeroacoustics community have firmly established the benefits of porous trailing edges to achieve low-noise radiation. However, most studies of porous treatment are based on the use of very complex, open-cell structures to manipulate turbulent flow. Although this implementation has been shown to improve the aeroacoustics performance, the exact physical mechanisms that can be drawn from such a geometry are limited due to their complex topology. This study aims to draw from previous works and to develop an optimised experimental method that utilises a 3D-printed array of rectilinear, structured permeable trailing edges on a NACA-0012 aerofoil based on a Box-Behnken experimental design. The essence of the work is to isolate individual porous parameters, and investigate the interdependencies of these parameters on target values such as the overall sound power level, the Strouhal number of the maximum noise reduction and many other characteristics of the far field. Twenty-eight porous trailing edges wereExtensive research efforts in the aeroacoustics community have firmly established the benefits of porous trailing edges to achieve low-noise radiation. However, most studies of porous treatment are based on the use of very complex, open-cell structures to manipulate turbulent flow. Although this implementation has been shown to improve the aeroacoustics performance, the exact physical mechanisms that can be drawn from such a geometry are limited due to their complex topology. This study aims to draw from previous works and to develop an optimised experimental method that utilises a 3D-printed array of rectilinear, structured permeable trailing edges on a NACA-0012 aerofoil based on a Box-Behnken experimental design. The essence of the work is to isolate individual porous parameters, and investigate the interdependencies of these parameters on target values such as the overall sound power level, the Strouhal number of the maximum noise reduction and many other characteristics of the far field. Twenty-eight porous trailing edges were produced based on the initial experimental design. Each is unique with the combination of streamwise and spanwise separation distance between the pores, pore size and porous coverage. The experiment was conducted over various angles of attack and Reynolds numbers. The results show that many of these trailing edges can indeed achieve low-noise radiation, and acceptable prediction accuracies are obtained for all the response variables except the total sound power reduction, ΔOAPWL, and the lower Strouhal limit of the noise reduction. This paper will establish the findings, discuss the results and detail the next stage of the experiment for the improvement of the statistical model.…


| Author: | Max M. Scholz, Till M. BiedermannORCiD, Tze Pei Chong, Edward Smith |
|---|---|
| DOI: | https://doi.org/10.2514/6.2022-3092 |
| Parent Title (English): | 28th AIAA/CEAS Aeroacoustics 2022 Conference |
| Publisher: | American Institute of Aeronautics and Astronautics |
| Place of publication: | Reston, Virginia |
| Document Type: | conference proceeding (article) |
| Language: | English |
| Date of first Publication: | 2022/06/13 |
| Release Date: | 2024/08/12 |
| Pagenumber: | 4869 - 4882 |
| First Page: | 4869 |
| Last Page: | 4882 |
| Konferenzangabe: | 28th AIAA/CEAS Aeroacoustics Conference 2022, 14-17 June 2022, Southampton, United Kingdom |
| institutes: | Fakultät Maschinenbau und Versorgungstechnik |
| Research Themes: | Energie & Ressourcen |
