Computational aeroacoustics of a cold aerospike nozzle at off-design conditions

The fluid flow and the aeroacoustic signature of an aerospike nozzle configuration are analyzed for one cold over-expanded configuration (Nozzle Pressure Ratio NPR3) and non-rotating inlet boundary conditions. Implicit Large Eddy Simulations (ILES) are performed, which provide data for far-field acoustic computations based on Ffowcs Williams-Hawkings equation (FWH). Power spectral density estimates in the far-field allow to identify screech and oscillations modes of the annular shock-cell structure as the main sources of sound