What is it about?
A velocity scaling law for separated flow is proposed and then derived for use with acoustic data, in this case the surface pressure fluctuation spectra and trailing edge noise spectra. This was done in order to find self-similar data to simplify the modeling of the latter spectra.
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Why is it important?
Flow separation and flow separation noise is a rarely touched topic. However, they have an increased importance in the design and certification of wind turbines. The environmental impact report of wind turbine installations considers noise impact to the surrounding communities. Noise reduction technologies have successfully abated the noise impact, but with the noise increase from flow separation, their usefulness is limited.
Perspectives
Writing this article provided a challenge, as no one measurement encompasses all the data required. Instead, the dataset used is a collection of different measurements. Some in the same facility, others in different ones. It is also a challenge in that the author has to drop well used assumptions and develop new ones. However, the result is satisfying, because it uses simple principles to achieve new results.
Dr Alexandre Suryadi
German Aerospace Center
Read the Original
This page is a summary of: Kinematic and Acoustic Similarities of Separated Turbulent Boundary Layers, June 2018, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2018-3937.
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