Aeroacoustic source contributions to sound power

A technique to investigate the contributions of aeroacoustic sources to the sound power is presented. The method combines the Lighthill source distribution with an acoustic impedance matrix constructed from radiation kernels of the free-field Green's function. By calculating the contributions of aeroacoustic sources to sound power, the location and nature of the dominant flow noise sources are identified. To demonstrate the technique, the flow noise produced by a pair of co-rotating vortices is examined. The aeroacoustic contribution of each component of the Lighthill tensor is determined for a range of wavenumbers, with key findings discussed.