Abstract
Simplified jet-flow models are utilized to predict the noise of jets issuing from complex or multiple nozzles and annular coplaner bypass nozzles. Comparison of the noise predicted from the simplified jet-flow models with experimental data is generally good, thus enabling the utilization of the prediction methods in determining optimum-design trends and limits for future jet engines. The results demonstrate that future jet engines can have significantly lower noise levels than those of current generation jets if noise is one of the major parameters that is considered during engine design. [Work supported by the U. S. Air Force Aeronautical Systems Division, Flight Dynamics Laboratory, Dynamics Branch, under contract AF 33(616)-5744.]
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