Mixer/ejector exhaust systems provide a unique means to reduce the jet noise associated with older aircraft while providing little or no impact on aircraft performance. This paper presents the results of using CFD analyses and ejector model testing to minimize installation losses associated with such mixer/ejector noise suppressors. Ejector performance data is obtained using dual flow model tests combined with a computerized data acquisition system. The resulting data is used to generate ejector performance results to calibrate an existing CFD analysis for ejector application. The calibrated CFD analysis is used to both analyze and modify existing pylon contouring to significantly reduce cruise losses associated with the ALMEC noise suppressor installation on the Gulfstream GIIB aircraft.

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