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

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

Research output: Contribution to journalConference articlepeer-review


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
StatePublished - 2008
Event64th Annual Forum - AHS International - Montreal, Canada
Duration: Apr 29 2008May 1 2008

All Science Journal Classification (ASJC) codes

  • General Engineering


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