Abstract This study reports the combustion oscillation features in a three-dimensional (3D) rocket-based combined-cycle (RBCC) engine combustor under flight Mach number (M flight) 3.0 conditions both experimentally and numerically. Experiment is performed on a direct-connect ground test facility, which measures the wall pressure along the flow-path. High-speed imaging of the flame luminosity and schlieren is carried out at exit of the primary rocket. Compressible reactive large eddy simulation (LES) with reduced chemical kinetics of a surrogate model for kerosene is performed to further understand the combustion oscillation mechanisms in the combustor. LES results are validated with experimental data by the time-averaged and root mean square (RMS) pressure values, and show acceptable agreement. Effects of the primary rocket jet on pressure oscillation in the combustor are analyzed. Relation of the high speed rocket jet oscillation, which is thought to among the most probable sources of combustion oscillation, with the RBCC combustor is recognized. Results reveal that the unsteady over-expanded rocket jet has significant impacts on the combustion oscillation feature of the RBCC combustor, which is different from a thermo-acoustics type oscillation. The rocket jet/air inflow physical interactions under different rocket jet expansion degrees are experimentally studied.

    Highlights Combustion oscillation in a RBCC combustor is studied by experiment and LES. High-speed flame luminosity and schlieren images at the rocket exit are recorded. The unsteady primary rocket jet is the major oscillation source in the combustor. Physical interactions between rocket jet and air inflow are experimentally studied.


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    Titel :

    Combustion oscillation study in a kerosene fueled rocket-based combined-cycle engine combustor


    Beteiligte:
    Huang, Zhi-Wei (Autor:in) / He, Guo-Qiang (Autor:in) / Qin, Fei (Autor:in) / Xue, Rui (Autor:in) / Wei, Xiang-Geng (Autor:in) / Shi, Lei (Autor:in)

    Erschienen in:

    Acta Astronautica ; 129 ; 260-270


    Erscheinungsdatum :

    2016-09-19


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch