Flow and Acoustic Fields of Rocket Jets Impinging on a Perforated Plate

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 2 In upstream direction, broadband shock-associated noise prevailing jet. For jets, main component in that direction produced impingement turbulent structures plate. downstream down to sound field dominated waves. Downstream plates, waves generated interactions between