Accession Number : AD0733590

Title :   Fan-Compressor Noise: Prediction, Research, and Reduction Studies.

Descriptive Note : Final rept. 9 Jan 69-29 Jan 71,

Corporate Author : PRATT AND WHITNEY AIRCRAFT EAST HARTFORD CONN

Personal Author(s) : Burdsall,E. A. ; Urban,R. H.

Report Date : FEB 1971

Pagination or Media Count : 396

Abstract : A study of fan and compressor noise was undertaken for the development of an accurate prediction system, based on theoretical concepts and/or empirical data, which would enable the selection of proper acoustical design choices for future engines. Experimental programs were conducted using a variety of test rigs to provide acoustic data and to validate theoretical concepts. Mathematical models were developed for each type of fan noise, and their applicability to actual engines was evaluated. Although more work is needed to reduce further the contribution of fan and compressor noise to the total noise levels of future engines, the material presented represents significant progress in the understanding of particular noise-generating mechanisms and the capability to predict fan noise. (Author)

Descriptors :   (*COMPRESSOR NOISE, *TURBOFAN ENGINES), (*FANS, *JET ENGINE NOISE), AIRCRAFT ENGINES, PREDICTIONS, REDUCTION, COMPRESSOR BLADES, BROADBAND, MATHEMATICAL MODELS

Subject Categories : Acoustics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE