Essentially, experiments use often scaled models and because of that the emitted sound frequency are not the same as they would be in the real model. For this reason using the Strouhal number they can scale the frequency with the characteristic length and predict what would happen in the real size model.
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prajput
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St is the Strouhal number. It represents a non-dimensional frequency and is defined as:
St = fL/U
where
f is the frequency
L is the characteristic length
U is the characteristic velocity
This number is typically used in acoustics to perform non-dimensional analyses and comparison.