NASA Technical Reports Server NTRS 20150014241: Near-Field Acoustic Power Level Analysis of F31-A31 Open Rotor Model at Simulated Cruise Conditions, Technical Report IIReportar como inadecuado



 NASA Technical Reports Server NTRS 20150014241: Near-Field Acoustic Power Level Analysis of F31-A31 Open Rotor Model at Simulated Cruise Conditions, Technical Report II


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Near-field acoustic power level analysis of F31A31 open rotor model has been performed to determine its noise characteristics at simulated cruise flight conditions. The non-proprietary parts of the test data obtained from experiments in the 8x6 supersonic wind tunnel were provided by NASA-Glenn Research Center. The tone and broadband components of total noise have been separated from raw test data by using a new data analysis tool. Results in terms of sound pressure levels, acoustic power levels, and their variations with rotor speed, freestream Mach number, and input shaft power, with different blade-pitch setting angles at simulated cruise flight conditions, are presented and discussed. Empirical equations relating models acoustic power level and input shaft power have been developed. The near-field acoustic efficiency of the model at simulated cruise conditions is also determined. It is hoped that the results presented in this work will serve as a database for comparison and improvement of other open rotor blade designs and also for validating open rotor noise prediction codes.



Autor: NASA Technical Reports Server (NTRS)

Fuente: https://archive.org/







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