Subsonic ramjets, due to its simplicity, nowadays could be very attractive for expendable unmanned applications. However, due to very low efficiency at low Mach numbers, practically there isn’t any important application at subsonic speed. In 50’s subsonic ramjet was used for tip jet applications. Later in 70’s there was a study of Fan Augmented Ramjet (FARJ) where a fan was in-tended to be powered by a piston engine, both in subsonic and supersonic regimes. Almost at the same time it was analyzed ejector augmented subsonic ramjet. Both of these studies did not find real application of such engines. Finally, there was an attempt for the use of an Electric Ducted Fan, used in RC models, with a combustor but exit fan pressure was almost at atmospheric pressure which results in very low efficiency.

    This paper presents a study of propulsion system which consists of a pitot intake, electrically powered compressor/fan, combustor and nozzle (Electrically Fan Augmented Ram Jet, EFARJ). The electric motor connection to the compressor/fan is direct, without gearbox, which implies usage of a high-speed brushless motor. Such propulsion system is compared to pure ramjet and finally it is compared to performances of small expendable turbojet. Comparison is made regarding costs, weight and thrust/consumption. The study shows that the proposed propulsion system could be competitive for expendable, low speed and short duration applications.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Study of Innovative Subsonic Ramjet


    Weitere Titelangaben:

    Lect. Notes in Networks, Syst.


    Beteiligte:
    Mitrovic, Nenad (Herausgeber:in) / Mladenovic, Goran (Herausgeber:in) / Mitrovic, Aleksandra (Herausgeber:in) / Davidović, Nikola (Autor:in) / Miloš, Predrag (Autor:in) / Kolarević, Nenad (Autor:in) / Ivanov, Toni (Autor:in) / Jojić, Branislav (Autor:in)

    Kongress:

    International Conference of Experimental and Numerical Investigations and New Technologies ; 2020 ; Zlatibor Mountain, Serbia June 30, 2020 - July 03, 2020



    Erscheinungsdatum :

    05.09.2020


    Format / Umfang :

    19 pages





    Medientyp :

    Aufsatz/Kapitel (Buch)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Subsonic combustion ramjet design

    Ingenito, Antonella | TIBKAT | 2021


    Subsonic Liquid Fueled Low Cost Ramjet

    C. M. Donaldson / C. E. Hornbeck | NTIS | 1975


    A subsonic ramjet engine for expendable drones

    BROWN, G. / HARRIS, G. / SEEMANN, G. | AIAA | 1978


    A subsonic ramjet engine for expendable drones

    Brown, G.I. / Harris, G.L. / Seeman, G.R. | Tema Archiv | 1978