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Tonal noise of a controlled-diffusion airfoil at low angle of attack and Reynolds number

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Figure

Fig. 1. (a) (Color online) Controlled-diffusion airfoil and (b) experimental set-up. (c) Presence of discrete tones in relation to the Reynolds number and angle of attack
Fig. 2. (Color online) Power spectral density (top) and spectrogram (bottom) of the microphone signal on the pressure side
Fig. 3. (Color online) Normalized square modulus of the wavelet coefficients of the microphone signal on the pressure side (top)
Fig. 4. (Color online) Bicoherence of the microphone signal on the pressure side. The flow velocity is set to (a) U ¼ 16 m/s, (b) U ¼ 20 m/s, and (c) U ¼ 34 m/s and the angle of attack is set to a ¼ 0  .

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