The High-Speed Impulsive Noise Prediction Through a Volume Integration: the Problem of Multiple Emission Times

The problem of the HSI noise prediction from rotating blades is treated through a volume integration, following the so called acoustic analogy approach. Two different solution forms are adopted, moving the integration domain from the computational grid to its own acoustic image, to bypass the numerical singularities in the integral kernels. The problem of multiple emission times and the subsequent decomposition of the acoustic volume into three separate supersonic regions is addressed, trying to point out at some possible numerical solution. Then a brief discussion about the methodology is proposed, trying to point out the advantages and th eperspectives of this particular numerical approach.