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

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

Research output: Contribution to journalArticlepeer-review

5 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 languageEnglish (US)
Article number032004
JournalJournal of the American Helicopter Society
Volume59
Issue number3
DOIs
StatePublished - Jul 2014

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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