Blade-wake interaction on a two blade rotor with prediction of the radiated noise stationary and forward flight, comparison between calculation, and experiment

The method of the vortex networks is applied to the calculation of the flow around a two blade rotor. The obtained results were compared to measured results with a good agreement for the stationary flight. The charges obtained for the forward flight were used to calculate the radiated noise by the Ffowcs-Williams and Hawkings equation. It is concluded that the radiated noise is greatly influenced by the flight conditions and the parameters of the calculation method, such as the coefficients of the Biot and Savert law.