Testing of identical dual-mode scramjet flowpath geometries in the freejet and direct-connect configurations was conducted in two separate facilities. These tests enabled a comparison study between the two configurations, which was directed toward the determination of the effects of inlet distortion and backpressure on the performance and operability of a dual-mode scramjet. Bulk flow conditions were matched between the two facilities at the isolator entrance plane to simulate Mach 4.8 flight, and a series of metrics were established to quantify similarities and differences. The effects of flowpath backpressure in the direct-connect case were seen to be isolated to regions close to the exhaust. An approximate 10% decrease in combustor pressure rise and consequently integrated pressure force were observed in the freejet configuration; shock train length, however, remained the same. Mode transition was delayed from an equivalence ratio of 0.5 in the direct-connect case to 0.7 in the freejet configuration. Further, ignition difficulties were experienced in the freejet tests which were not encountered in those of direct-connect tests, limiting the scope of comparable test points. This work represents the first attempt at a quantitative comparison in the literature of an identical direct-connect and freejet dual-mode scramjet.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Comparison of a Direct-Connect and Freejet Dual-Mode Scramjet


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2015-06-30


    Format / Umfang :

    13 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    FOCUSING-SCHLIEREN VISUALIZATION IN DIRECT-CONNECT DUAL-MODE SCRAMJET

    Kouchi, T. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2012


    Focusing-schlieren Visualization in Direct-connect Dual-mode Scramjet

    Kouchi, Toshinori / Goyne, Christopher / Rockwell, Robert et al. | AIAA | 2012


    Freejet Testing of the 75%-scale HIFiRE 7 REST Scramjet Engine

    Wilson Chan, Yong Khang / Razzaqi, Sarah A. / Wise, Dylan J. et al. | AIAA | 2014


    Freejet Testing of the HIFiRE 7 Scramjet Flowpath at Mach 7.5

    Chan, Wilson Y. K. / Razzaqi, Sarah A. / Turner, James C. et al. | AIAA | 2018