Transonic Noise Prediction of Rotating Blades by Means of the Kirchhoff Formulation

Over the last few years a large effort has been devoted at CIRA to the analysis of capabilities and limits of the FWH formulations. Nevertheless, following the trend of most research institutions and industries, a new code implementing the Kirchhoff formulation has been developed and tested. The possibility of using in parallel this new code with the ones solvin the FWH equation permits to increase the CIRA capabilities in the prediction of the acoustic disturbance. The main aim of the paper is to show the reliability of the new Kirchhoff solver in rotor and propeller noise predictions.