NDLI: Noise of a model helicopter rotor due to ingestion of turbulence

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Noise of a model helicopter rotor due to ingestion of turbulence

Content Provider	NASA Technical Reports Server (NTRS)
Author	Paterson, R. W. Amiet, R. K.
Copyright Year	1979
Description	A theoretical and experimental investigation of the noise of a model helicoper rotor due to ingestion of turbulence was conducted. Experiments were performed with a 0.76 m dia, articulated model rotor for a range of inflow turbulence and rotor operating conditions. Inflow turbulence levels varied from approximately 2 to 19 percent and tip Mach number was varied from 0.3 to 0.52. Test conditions included ingestion of a atmospheric turbulence in outdoor hover as well as ingestion of grid generated isotropic turbulence in the wind tunnel airstream. In wind tunnel testing, both forward flight and vertical ascent (climb) were simulated. Far field noise spectra and directivity were measured in addition to incident turbulence intensities, length scales, and spectra. Results indicate that ingestion of atmospheric turbulence is the dominant helicopter rotor hover noise mechanism at the moderate to high frequencies which determine perceived noise level.
File Size	6696348
Page Count	132
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19800002821
Archival Resource Key	ark:/13960/t9b61cr26
Language	English
Publisher Date	1979-11-01
Access Restriction	Open
Subject Keyword	Aircraft Design, Testing And Performance Vertical Flight Laminar Boundary Layer Atmospheric Turbulence Aircraft Noise Wind Tunnel Tests Noise Prediction Aircraft Isotropic Turbulence Hovering Noise Spectra Rotary Wings Flight Simulation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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