AERODYNAMIC AND ACOUSTIC CALCULATIONS OF TRANSONIC NONLIFTING HOVERING ROTORS

Results from an Euler and a Full Potential Solver are compared for a n onlifting transonic hovering rotor, The correlation is very good on th e blade, but the aerodynamic disturbances are damped by the Pull Poten tial Code off the blade tip, The ability of both codes to provide near -field input data for acoustic predictions using Lighthill's Acoustic Analogy is checked, Acoustic results using Euler input data show a fai rly good correlation with experiment and with direct Euler far-field c alculations, even in the case of delocalization, On the contrary, the precision of the Full Potential results is insufficient for that purpo se, and further work is needed to improve the code's stability and acc uracy off the blade.