This work is a fundamental investigation of the behavior of precombustion shock trains in the T4 Stalker Tube at the upper end of the dual-mode combustion regime. Experiments were conducted at a condition that represents flight at Mach 8 at an altitude of 26 km. The test model was a simple axisymmetric duct comprising a short diffuser, an isolator ( length / diameter = 4.1 ), and a constant-area combustor ( length / diameter = 15.7 ). Gaseous hydrogen was used as the fuel and was injected via six portholes equispaced around the perimeter of the duct. Time histories of the surface pressure in the model showed a pressure rise from stable supersonic combustion up to a fuel equivalence ratio of 0.9. At higher fuel levels, a precombustion shock train formed upstream of the point of fuel injection. Between equivalence ratios of 0.9 and 1.1, the shock train established itself and remained stable over a significant portion of the approximately 3 ms test window. Above an equivalence ratio of 1.1, the pressure time histories continued to rise throughout the test window and a stable flow was not established. These results indicate that short-duration facilities like the T4 Stalker Tube can be used for dual-mode combustion studies at fuel levels below a limit that will depend on the particular flow condition and model geometry.


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    Titel :

    Flow Establishment of Precombustion Shock Trains in a Shock Tunnel


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 55 , 9 ; 2902-2911


    Erscheinungsdatum :

    01.09.2017




    Medientyp :

    Aufsatz (Konferenz) , Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch