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

Research output: Contribution to journalConference article

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 methodology 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 methodology. The prediction method is also demonstrated through a brief investigation of design constraints and their impact the rotor noise levels.

Original languageEnglish (US)
Pages (from-to)663-674
Number of pages12
JournalAnnual Forum Proceedings - AHS International
Volume1
StatePublished - Sep 1 2008
Event64th Annual Forum - AHS International - Montreal, Canada
Duration: Apr 29 2008May 1 2008

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Rotors
Turbomachine blades
Torque
Acoustics
Aircraft
Derivatives

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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title = "A method for predicting the noise of a tip-jet driven rotor",
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 methodology 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 methodology. The prediction method is also demonstrated through a brief investigation of design constraints and their impact the rotor noise levels.",
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publisher = "American Helicopter Society",

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A method for predicting the noise of a tip-jet driven rotor. / Brentner, Kenneth Steven; Morris, Philip John; Lopes, Leonard V.

In: Annual Forum Proceedings - AHS International, Vol. 1, 01.09.2008, p. 663-674.

Research output: Contribution to journalConference article

TY - JOUR

T1 - A method for predicting the noise of a tip-jet driven rotor

AU - Brentner, Kenneth Steven

AU - Morris, Philip John

AU - Lopes, Leonard V.

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Y1 - 2008/9/1

N2 - 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 methodology 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 methodology. The prediction method is also demonstrated through a brief investigation of design constraints and their impact the rotor noise levels.

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 methodology 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 methodology. The prediction method is also demonstrated through a brief investigation of design constraints and their impact the rotor noise levels.

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