Progress in the Development of Optimally Quiet Turboprop Engines and Installations 730287

A program, under the sponsorship of the U.S. Air Force Aero Propulsion Laboratory, is now under way to provide the computational tools necessary to predict noise signatures for small turbopropulsion engines and to design attenuation equipment as required to meet specific low-noise goals. The 24 month program, scheduled for completion in August 1973, involves the analysis of turbine engine noise prediction and attenuation methods, as well as the experimental verification of these analyses with full-scale hardware. This paper reviews the methodology development phases and examines acoustical data from bare and attenuated engine tests.


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