Environmentally acceptable acoustics has been one of the major technical challenges to be met prior to the development of an Advanced Supersonic Transport (AST) by American industry. A dominant problem has been community jet noise associated with the propulsion system and more specifically the propulsion exhaust system. Traditionally, abatement schemes have been applied to exhaust systems with some success; however, the performance penalties previously associated with these schemes have been large and thus have not been economically viable for an AST application. Recent work sponsored by NASA has offered the potential of accomplishing acoustic suppression with favorable trades on propulsion performance. The results of this work indicate that a superposition of three acoustic suppression schemes in a single exhaust system offers the potential to satisfy stringent noise goals with the potential for performance levels appropriate to the attainment of an economically feasible AST aircraft. This paper presents results of design studies, mission analysis, and scale model testing aimed at establishing a candidate AST exhaust system.
Aerodynamic performance of acoustically suppressed exhaust nozzles
Aerodynamischer Wirkungsgrad akustisch gedaempfter Abgasduesen
AIAA-Papers ; 1-7
1984
7 Seiten, 21 Bilder, 1 Quelle
Conference paper
English
Engineering Index Backfile | 1918
NTRS | 1971
|