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


    Contributors:
    Jardin, T. (author) / Grondin, G. (author) / Gressier, J. (author) / Huo, C. (author) / Doué, N. (author) / Barènes, R. (author)

    Published in:

    AIAA Journal ; 53 , 7 ; 1836-1844


    Publication date :

    2015-03-06


    Size :

    9 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    Froude's quasi-dimensionless coefficient

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



    Froude's law for the airship

    Greenhill, George | Engineering Index Backfile | 1916


    SHROUDED FAN ROTOR

    CHRABASCZ ERIC / PRASAD DILIP / LOKHANDWALLA MURTUZA et al. | European Patent Office | 2016

    Free access