Prediction of potential noise interactions in axial-flow machines - Application to the helicopter fenestron
Abstract
A method for predicting the far-field noise created in a rotor by the flow around cylindrical obstacles (such as support arms) placed downstream of the rotor is proposed. Application of the method to helicopter rotor blades shows that this noise source can account for the fundamental and first harmonics of the blade frequencies. It is suggested that higher frequences may be due to the absorption of atmospheric turbulence.
- Publication:
-
Academie des Sciences Paris Comptes Rendus Serie Sciences Mathematiques
- Pub Date:
- February 1989
- Bibcode:
- 1989CRASM.308..703F
- Keywords:
-
- Helicopter Tail Rotors;
- Interactional Aerodynamics;
- Noise Prediction (Aircraft);
- Turbocompressors;
- Axial Flow;
- Far Fields;
- Rotor Aerodynamics;
- Sound Pressure;
- Acoustics