ETD system

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Tesi etd-06282015-154829


Thesis type
Tesi di laurea magistrale
Author
D'AGOSTO, STEFANO
URN
etd-06282015-154829
Title
Further Development of an Analytical Model for Helicopter Main Rotor Wake-Tail Interactions
Struttura
INGEGNERIA CIVILE E INDUSTRIALE
Corso di studi
INGEGNERIA AEROSPAZIALE
Commissione
tutor Ing. Ries, Tobias
relatore Prof. Quarta, Alessandro A.
Parole chiave
  • wake
  • vortex
  • vertical stabilizer
  • UTRC
  • tip vortex
  • tail rotor
  • tail
  • swirl
  • mast moment
  • Landgrebe
  • interactions
  • horizontal stabilizer
  • helicopter
  • generalized wake model
  • fin
  • fenestron blade pitch
  • fenestron
  • Eurocopter
  • empennage
  • wake contraction
  • downwash
  • antitorque
  • Airbus Helicopters
  • Airbus
  • wake deformation
  • wake model
  • wake modeling
Data inizio appello
21/07/2015;
Consultabilità
parziale
Data di rilascio
21/07/2085
Riassunto analitico
Simulation of aerodynamic and flight mechanic characteristics is essential to<br>predict helicopter flight behaviour. One of the most important features is certainly<br>the interactions between the main rotor wake and different helicopter components.<br>This Master Thesis focuses on an analytical model able to predict and evaluate<br>main rotor wake interactions with tailboom, empennage and fenestron. This was<br>implemented in a more general flight mechanical simulation code. The first version<br>was created in a former master thesis by Airbus Helicopters. Further development<br>have been requested in order to have a better estimation of computed quantities in<br>trimmed conditions for a higher range of speeds. The previous model, indeed, was<br>suitable only for hover and low velocity steady forward flight.<br>For this purpose, has been fundamental a better estimation of lateral forces and of<br>wake geometry. Researches about influence of different factors have been conducted<br>and new physical models considering fin and fenestron interactions and wake<br>distortion have been derived and implemented.<br>Two main variables have been considered as quality indicators: mast moment and<br>fenestron blade pitch. Nevertheless, other quantities like forces and velocities have<br>always been taken into account as well. Computed results have been compared<br>with flight test data in order to verify the reliability of the improved simulation<br>model. Moreover, CFD analysis have been used to clearly understand the wake<br>behaviour.
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