This paper extends Froude's momentum theory for free propellers to the analysis of shrouded rotors. A one-dimensional analytical approach is provided, and a homokinetic normal inlet surface model is proposed. Formulations of thrusts and power for each system component are derived, leading to the definition of optimum design criteria and providing insight into the global aerodynamics of shrouded rotors. In the context of micro-air vehicles applications, assessment of the model is conducted with respect to numerical data. Overall, comparison between numerical and analytical results shows good agreement and highlights the sensitivity of the model to viscous effects.


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    Title :

    Revisiting Froude's Theory for Hovering Shrouded Rotor



    Published in:

    Publication date :

    2015




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    55.50 Luftfahrzeugtechnik / 55.60 Raumfahrttechnik / 55.60 / 50.93 / 55.50 / 50.93 Weltraumforschung
    Local classification TIB:    770/7040



    Revisiting Froude’s Theory for Hovering Shrouded Rotor

    Jardin, T. / Grondin, G. / Gressier, J. et al. | AIAA | 2015


    Froude's quasi-dimensionless coefficient

    Labberton, J.M. | Engineering Index Backfile | 1939



    Froude's law for the airship

    Greenhill, George | Engineering Index Backfile | 1916