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The effect of rotor design on the fluid dynamics of helicopter brownout

Phillips, C. and Kim, H.W. and Brown, R.E. (2009) The effect of rotor design on the fluid dynamics of helicopter brownout. In: 35th European Rotorcraft Forum, 2009-09-22 - 2009-09-25, Hamburg, Gemany.

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    Abstract

    Helicopters operating close to the ground in dusty environments tend to generate large clouds of dust in the surrounding air. These clouds can obscure the pilot's view of the ground and lead to a dangerous condition known as brownout. Given the intimate relationship between the induced flow feld around the rotor and the process through which the particulate matter becomes airborne and is subsequently transported, it has been speculated that the design of its rotor may influence the shape and size of the dust clouds that are produced by any particular type of helicopter. This paper presents a study of the influence of two key geometric properties of the rotor on the development of these dust clouds. A particle transport model is coupled to Brown's Vorticity Transport Model to represent the dynamics of the particulate-air system surrounding a generic helicopter rotor under various flight conditions. The number of blades on the rotor is altered, whilst keeping the solidity constant, thus altering the distribution of vorticity that is released onto the ground. In addition, the twist of the blades is varied in order to investigate the effect of the resultant changes in the distribution of induced downwash on the evolution of the dust cloud. The study suggests that, in general, the larger the number of blades, and the higher the blade twist, the less dense the dust clouds that are produced under brownout conditions. It appears thus that the characteristics of the dust clouds are indeed sensitive to the geometry of the rotor and hence that careful aerodynamic design may allow the severity of brownout to be ameliorated.

    Item type: Conference or Workshop Item (Paper)
    ID code: 27436
    Keywords: helicopter brownout, particle transport model, vorticity transport model, rotor geometry, rotor aerodynamics, Mechanical engineering and machinery, Motor vehicles. Aeronautics. Astronautics
    Subjects: Technology > Mechanical engineering and machinery
    Technology > Motor vehicles. Aeronautics. Astronautics
    Department: Faculty of Engineering > Mechanical and Aerospace Engineering
    Related URLs:
      Depositing user: Ms Katrina May
      Date Deposited: 13 Sep 2010 15:17
      Last modified: 11 Oct 2012 11:10
      URI: http://strathprints.strath.ac.uk/id/eprint/27436

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