Research Article
Electrically Controlled Rotor Blade Vortex Interaction Airloads and Noise Analysis Using Viscous Vortex Particle Method
Figure 12
Midfrequency (6th–40th) BVI noise directivity pattern of the ECR with pre-index angle. (a) Predicted SPL noise contours; (b) difference of SPL between ECR with and pre-index angle.
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