SST Technology Follow-On Program - Phase 2. Noise Suppressor/Nozzle Development. Volume 1. Program summary

Abstract : An environmentally acceptable SST must have noise levels comparable to those of other large commercial transports operating in the same time period. A program has been conducted investigating a method of reducing high velocity jet noise associated with SST-type engines to levels below current regulations. The study investigated the following technology areas: noise suppression, nozzle thrust performance, static to flight effects and design/mechanical feasibility requirements. This technology base is believed applicable to any engine cycle having a high-velocity exhaust. The program concluded with static testing of an advanced suppressor nozzle system on a J-58 (turbojet) demonstrating a noise reduction in excess of 16 PNdB for 0.75% thrust penalty at static conditions. These results were then applied to the B2707-300 airplane to indicate the advance in technology achieved by the current program.