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.
Pictures
Publications
Journal
Sharma, A., & Chen, H. (2013). Prediction of aerodynamic tonal noise from open rotors. Journal of Sound and Vibration, 332(16), 3832–3845. https://doi.org/10.1016/j.jsv.2013.02.027
@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},
pdf = {Sharma_2013_OR.pdf}
}
Conference proceedings
Selvaraj, S., Chaves, A., Takle, E., & Sharma, A. (2013). Numerical Prediction of Surface Flow Convergence Phenomenon in Windfarms. RUZGEM, Middle Eastern Technical University.
@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}
}
Sharma, A., & Chen, H. (2012). Prediction of Tonal Aerodynamic Noise from Open Rotors. 18th AIAA/CEAS Aeroacoustics Conference, AIAA-2012. https://doi.org/10.2514/6.2012-2265
@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},
pdf = {sharma_2012_OR.pdf}
}