Open Rotor Noise

Open rotor is a next-generation engine architecture being evaluated by NASA in conjunction with Airbus/Boeing and GE/R&R. It has a huge (over 10%) potential fuel burn advantage over conventional turbofan engines. However, the aerodynamic noise from the large, un-ducted fan blades is a concern. We have developed time-linearized RANS based methods in frequency domain to predict tonal noise from open rotors. The common sources are: wake-rotor and vortex-rotor interaction noise. Results from these prediction methods have been validated against data obtained during the recent test campaign run by NASA and GE at the low-speed wind tunnel at NASA Glenn.

Publications

Journal

1. Sharma, A., & Chen, H. (2013). Prediction of aerodynamic tonal noise from open rotors. Journal of Sound and Vibration, 332(16), 3832–3845.
   PDF DOI BIB

   @article{sharma2013prediction,
     title = {Prediction of aerodynamic tonal noise from open rotors},
     author = {Sharma, A and Chen, H},
     journal = {Journal of Sound and Vibration},
     volume = {332},
     number = {16},
     pages = {3832--3845},
     year = {2013},
     publisher = {Elsevier},
     doi = {10.1016/j.jsv.2013.02.027},
     note = {OpenRotor, Aeroacoustics},
     file = {Sharma_2013_OR.pdf}
   }
   

Conference proceedings

1. Selvaraj, S., Chaves, A., Takle, E., & Sharma, A. (2013). Numerical Prediction of Surface Flow Convergence Phenomenon in Windfarms. RUZGEM, Middle Eastern Technical University.
   BIB

   @inproceedings{sharma2013numerical,
     author = {Selvaraj, S. and Chaves, A. and Takle, E. and Sharma, A.},
     title = {Numerical Prediction of Surface Flow Convergence Phenomenon in Windfarms},
     booktitle = {RUZGEM, Middle Eastern Technical University},
     address = {Ankara, Turkey},
     note = {OpenRotor},
     year = {2013}
   }
   

2. Sharma, A., & Chen, H. (2012). Prediction of Tonal Aerodynamic Noise from Open Rotors. 18th AIAA/CEAS Aeroacoustics Conference, AIAA-2012. http://arc.aiaa.org/doi/pdf/10.2514/6.2012-2265
   PDF DOI BIB

   @inproceedings{sharma2012prediction,
     title = {Prediction of Tonal Aerodynamic Noise from Open Rotors},
     author = {Sharma, A and Chen, H},
     booktitle = {18th AIAA/CEAS Aeroacoustics Conference, AIAA-2012},
     address = {Colorado Springs, CO, USA},
     year = {2012},
     url = {http://arc.aiaa.org/doi/pdf/10.2514/6.2012-2265},
     doi = {10.2514/6.2012-2265},
     note = {OpenRotor, Aeroacoustics},
     file = {sharma_2012_OR.pdf}
   }