Combustion Generated Noise in Turbopropulsion Systems.
Interim technical rept.,
GEORGIA INST OF TECH ATLANTA SCHOOL OF AEROSPACE ENGINEERING
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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 U2.7 D2.8 SL1.4 F0.4, 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 Strahles theory of combustion noise. Author
- Combustion and Ignition
- Jet and Gas Turbine Engines