COMPUTATIONAL AND EXPERIMENTAL-ANALYSIS OF THE SCATTERING BY ROTATINGFANS

The electromagnetic scattering of rotating blades is investigated both theoretically and experimentally. We have developed an analytical met hod based on physical optics (PO) and the method of equivalent current s (MEC), in conjunction with the quasi-stationary method. We have pred icted the bistatic field scattered by a multiple skew-plated rotating fan, Comparisons with a numerical calculation based on the method of m oments and with measurements have given very satisfactory results. A c omparison with previously published results has also been carried out. Physical interpretations are given both in time and frequency domains . Our analytical model correctly predicts the spreading and magnitude of the frequency response as a function of the scatterer's skew angles , its rotation frequency, and the directions of incidence and scatteri ng.