Accession Number : AD0782203

Title :   Acoustic Tests on a Fan-in-Wing Model: Effects of an Extended Inlet. (Essais Acoustiques d'une Maquette de Rotor Noye dans l'Aile: Influence d'une Extension de l'Entree d'Air du Rotor).

Descriptive Note : Aeronautical rept.,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF MECHANICAL ENGINEERING

Personal Author(s) : Krishnappa,G.

Report Date : FEB 1974

Pagination or Media Count : 58

Abstract : The study describes the comparative acoustic tests conducted on a 12 in. diameter fan-in-wing model with an extended inlet referenced to the standard shallow inlet. The aim of the tests was to find the effect of extending the depth of the inlet on the noise radiation characteristics of the fan, both at static and crossflow conditions. The studies also included induct sound measurements done to observe the change in the characteristics of the blade passing frequency tones due to crossflow over the fan. (Modified author abstract)

Descriptors :   *Vertical takeoff aircraft, *Ducted fans, Acoustics, Acoustic signatures, Far field, Cross flow, Harmonics, Canada

Subject Categories : V/STOL
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE