The flow and acoustic fields of jets at a Mach number 3.1 impinging on plate the jet nozzle exit, where is diameter, have been investigated using highly resolved large-eddy simulations. perforated with hole diameter , or . full-plate free-jet cases also considered. pressure levels are highest for non-perforated decrease as increases. Compared free jet, they higher by about 5 dB full plate, 4 3 ...
