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- Title
A Method for Predicting the Noise of a Tip-Jet Driven Rotor.
- Authors
Brentner, Kenneth S.; Morris, Philip J.; Lopes, Leonard V.
- Abstract
The use of tip-jets to provide the torque to power rotor blades has long been considered as an alternate approach to a shaft-driven rotor system. However, large tip-jet exit velocities are needed to provide sufficient jet thrust to power the rotor; hence, these jets can generate very large noise levels when compared to the usual sources of rotating blade noise. This paper demonstrates a new approach to predict the noise from such a design. The prediction method uses a derivative of the SAE ARP876 (Revision D) code to compute the tip-jet noise and PSU-WOPWOP to compute the rotational noise. Noise predictions for the Fairey Rotodyne aircraft are compared with acoustic measurements to provide a limited validation of the noise prediction method. The prediction method is also demonstrated through a brief investigation of design constraints and their impact on the rotor noise levels.
- Subjects
TORQUE control; AERODYNAMIC noise; TURBOMACHINE blades; VELOCITY; ROTATIONAL motion; FAIREY Rotodyne (Helicopter)
- Publication
Journal of the American Helicopter Society, 2014, Vol 59, Issue 3, p032004-1
- ISSN
0002-8711
- Publication type
Article
- DOI
10.4050/JAHS.59.032004