Accession Number : AD0768615

Title :   Combustion Generated Noise in Turbopropulsion Systems.

Descriptive Note : Interim technical rept.,

Corporate Author : GEORGIA INST OF TECH ATLANTA SCHOOL OF AEROSPACE ENGINEERING

Personal Author(s) : Shivashankara,B. N. ; Handley,J. C. ; Strahle,W. C.

Report Date : 24 JUL 1973

Pagination or Media Count : 96

Abstract : Experiments on noise radiation by open turbulent premixed flames are described. Detailed directionality distributions, scaling rules for acoustic power radiated, thermo-acoustic efficiency and spectral content are presented and discussed. Scaling rules for reacting volume are generated by a direct flame photography technique. These experiments are shown to be quite useful in decomposing combustion noise scaling laws. The acoustic power is shown to scale as U(2.7) D(2.8) SL(1.4) F(0.4), and combustion noise spectra peak in the 250-700 Hz range. The directionality is quite weak for noise from open turbulent flames. The experimental results are critically examined in the light of the theoretical predictions from Strahle's theory of combustion noise. (Author)

Descriptors :   (*COMBUSTION, ACOUSTICS), (*JET ENGINE NOISE, COMBUSTION), FLAMES, TURBULENCE, JET FLAMES, AFTERBURNING, POWER SPECTRA, SCREAMING COMBUSTION, EXPERIMENTAL DATA

Subject Categories : Acoustics
      Combustion and Ignition
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE