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.

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.
  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