Acoustic Test Of A Model Rotor And Tail Rotor Results For The Isolated Rotors And Combined Configuration
Download Acoustic Test Of A Model Rotor And Tail Rotor Results For The Isolated Rotors And Combined Configuration PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Acoustic Test Of A Model Rotor And Tail Rotor Results For The Isolated Rotors And Combined Configuration book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages.
Acoustic Test of a Model Rotor and Tail Rotor
Author: National Aeronautics and Space Administration (NASA)
language: en
Publisher: Createspace Independent Publishing Platform
Release Date: 2018-07-06
Acoustic data from a model scale main rotor and tail rotor experiment in the NASA Langley 14 by 22 Foot Subsonic Tunnel are presented for the main rotor and trail rotor in isolation and for the two rotors operating together. Results for the isolated main rotor show the importance of the rotor flapping conditions on mid-frequency noise content. High levels of main rotor retreating side blade-vortex interaction noise are shown to radiate downstream of the model. The isolated tail rotor noise results show the dominance of harmonic noise in the thrusting direction. The occurrence of tail rotor broadband noise is seen by the broadening of the tail rotor harmonics and is attributed to fuselage wake turbulence. The combined main and tail rotor data are presented to show the dominance of each rotor's different noise sources at different directivity locations. Martin, R. M. and Burley, C. L. and Elliott, J. W. Langley Research Center...