A propeller (fig.2,210) has multiple rotor blades 112 generating thrust when operating in a medium, the propeller has a thrust coefficient CT of between 0.15 to 0.5. The thrust coefficient performance space is defined as CT = T / (ρ A1 Umean2), where T is the generated fan thrust, ρ is the medium fluid density, A1 is the rotor blade actuator disc area, and Umean is the mean medium efflux velocity of the medium from an electric propulsion system 102. The rotor blades are preferably mounted within an annular shroud 114, and CT may be between 0.2 to 0.4. Also claimed is an electric propulsion system with a nacelle 104 housing a propeller with a number of rotor blades, at least one of a number of inlet guide vanes 140 and/or outlet guide vanes 142 which have a predetermined relationship with a number of rotor blades, such as a certain ratio of vanes to blades. The ratio of inlet vanes to blades may be 0 to 0.95, and the ratio of outlet vanes to blades may be 0.75 to 2, the number of rotor blades between 5 to 25.


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    Title :

    Electric propulsion systems


    Publication date :

    2023-06-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English



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