A method for predicting the noise of a tip-jet driven rotor

Kenneth S. Brentner; Philip J. MorrisG; Leonard V. Lopes

doi:10.4050/JAHS.59.032004

A method for predicting the noise of a tip-jet driven rotor

Kenneth S. Brentner, Philip J. MorrisG, Leonard V. Lopes

Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

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.

Original language	English (US)
Article number	032004
Journal	Journal of the American Helicopter Society
Volume	59
Issue number	3
DOIs	https://doi.org/10.4050/JAHS.59.032004
State	Published - Jul 2014

All Science Journal Classification (ASJC) codes

General Materials Science
Aerospace Engineering
Mechanics of Materials
Mechanical Engineering

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10.4050/JAHS.59.032004

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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.",

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AB - 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.

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A method for predicting the noise of a tip-jet driven rotor

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