A hydrogen propeller is the method of propulsion of a conceptual supersonic vehicle that operates within a hydrogen-filled tube at cruise speed of 1 km/s. Because Mach number governs formation of shock waves at the blade tips, the high sonic speed of hydrogen allows a rotational frequency 3.85 times faster than the same propeller operating in air immediately outside the tube. Rankine–Froude propulsive efficiency and – for a given vehicle Mach number–propeller pitch and helix angle are invariant with respect to the atmosphere. To achieve constant efficiency at a given thrust and for adequate acceleration, the low density of hydrogen requires some combination of higher frequency, more blades, or larger diameter. The hydrogen propeller conceptual design employs 14 contra-rotating blades, 4.11 m diameter, and rotational frequency of 40.4 s−1 at translational velocity of 970 m/s.


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    Titel :

    Hydrogen tube vehicle for supersonic transport: 4. Hydrogen propeller


    Beteiligte:


    Erscheinungsdatum :

    2012


    Format / Umfang :

    9 Seiten, 26 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch







    Study of supersonic propeller

    Fabri, J. / Siestrunck, R. | Engineering Index Backfile | 1953


    Study of the supersonic propeller

    Fabri, Jean / Siestrunck, Raymond | NTRS | 1953