Application of synthetic phased array techniques to hot supersonic jet noise

The use of an unsteady CFD simulation to provide data for a full acoustic analysis of a hot supersonic jet flow has been demonstrated in a preliminary study. The CHOPA solver was used to predict the near-field flow solution. The data from the CFD simulation was sampled to provide the input for the PSU-WOPWOP Ffowcs Williams-Hawkings solver. PSU-WOPWOP was used to predict the farfield acoustic conditions at locations that correspond to a virtual phased array of microphones. The pressure "measurements" from the virtual array were then processed using the Beamform Interactive software package using the same techniques used for physical microphone array measurements. All the stages of this process have been demonstrated to show how the process is able to predict the expected dominant noise sources in the flow from a military-style faceted nozzle. When fully realized, this technology offers the possibility of providing the insight needed to develop improved beamforming methods as well as allowing the screening of nozzle designs and experimental configurations for acoustical qualities prior to fabrication and operational testing.