EXPERIMENTAL STUDY OF SOUND POWER RADIATED FROM COLD MODEL JETS AND GROUND SILENCING ARRANGEMENTS. VOLUME 1
MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY
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An experimental and exploratory study of radiated sound power has been conducted with cold model jets and various additions to those jets. The objective was to provide insight into the physical acoustical problems related to the design of ground runup silencers for use with advanced jet aircraft. The results demonstrate the complexity of this silencing problem and indicate how the radiated sound power from a given jet can be increased or decreased through several orders of magnitude. The results indicate that various features common to current muffler hardware must act to increase rather than decrease noise with consequent limitation to the silencing obtainable. Further results suggest how to proceed more directly with silencing. A complete exploration of methods and parameters has not been possible and thus additional research is needed to yield all of the insight that can be provided by study of model jets.