Aeroacoustic Noise Modeling

This video shows a noise simulation from a helicopter blade slice revolving five times with a Mach number of 0.85 and an advance ratio of 0.05. The noise field is shown on a grid of receivers in the shape of a half-sphere, 3 blade lengths from the center of rotation. The time history of the noise at four receivers in the rotor plane as well as their corresponding frequency spectrum are shown at the end.

The same noise simulation is shown here in a Lambert projection.