Accession Number : AD0455423


Title :   GAS TURBINE SOUND ATTENUATION. VOLUME I.


Descriptive Note : Final engineering rept.,


Corporate Author : GARRETT CORP PHOENIX AZ AIRESEARCH MFG DIV


Personal Author(s) : Spears, E L ; Wirt, L S


Report Date : 05 Jul 1963


Pagination or Media Count : 141


Abstract : The activities of the sound-attenuating program are summarized. An analysis of the spinning mode theory, a complete experimental verification of the theory, an extension of the theory into solid materials, and analysis of the future implications of the theory are presented. The concept of spinning modes and its development into a concise theory by Tyler and Sofrin discussed, represents a fundamental breakthrough in the understanding of the complex pressure fluctuations that occur in all types of turbomachinery and fans. The experimental verification of the theory was undertaken as a part of the analytical portion of this acoustical study of gas turbines. Such sweeping theory warrants careful and repeated experimental verification to establish its limits of validity and to add confidence to its application. The major postulates of the theory were exposed under closely controlled conditions and lead to the conclusion the theory is exact. The available acoustical data was reviewed in the light of the spinning mode theory. The problem is readily soluable by spinning mode techniques as opposed to an unsatisfactory solution by vector analysis. (Author)


Descriptors :   ENGINE NOISE , ATTENUATION , COMPRESSOR NOISE , PRESSURE , DUCTS , COMPRESSOR COMPONENTS , SOUND , TURBINE COMPONENTS , TURBINES , WATER , SPINNING(INDUSTRIAL PROCESSES) , SHELLS(STRUCTURAL FORMS) , ELASTIC PROPERTIES , VIBRATION , VELOCITY , RESONANCE , COMPRESSOR BLADES


Distribution Statement : APPROVED FOR PUBLIC RELEASE