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Contra-Rotating Open Rotor Tone Noise PredictionReliable prediction of contra-rotating open rotor (CROR) noise is an essential element of any strategy for the development of low-noise open rotor propulsion systems that can meet both the community noise regulations and the cabin noise limits. Since CROR noise spectra typically exhibits a preponderance of tones, significant efforts have been directed towards predicting their tone spectra. To that end, there has been an ongoing effort at NASA to assess various in-house open rotor tone noise prediction tools using a benchmark CROR blade set for which significant aerodynamic and acoustic data had been acquired in wind tunnel tests. In the work presented here, the focus is on the near-field noise of the benchmark open rotor blade set at the cruise condition. Using an analytical CROR tone noise model with input from high-fidelity aerodynamic simulations, detailed tone noise spectral predictions have been generated and compared with the experimental data. Comparisons indicate that the theoretical predictions are in good agreement with the data, especially for the dominant CROR tones and their overall sound pressure level. The results also indicate that, whereas individual rotor tones are well predicted by the linear sources (i.e., thickness and loading), for the interaction tones it is essential that the quadrupole sources be included in the analysis.
Document ID
20150002087
Acquisition Source
Glenn Research Center
Document Type
Presentation
Authors
Envia, Edmane (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
February 25, 2015
Publication Date
June 18, 2014
Subject Category
Aerodynamics
Report/Patent Number
GRC-E-DAA-TN15607
Meeting Information
Meeting: AIAA/CEAS Aeroacoustics Conference
Location: Atlanta, GA
Country: United States
Start Date: June 16, 2014
End Date: June 20, 2014
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 473452.02.03.07.06.01.08
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
Propeller Noise
Aerodynamic Noise
Noise Prediction

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