A twin-jet configuration is composed of two jets placed in closed proximity to each other. Previous works on such configurations have been mostly experimental in nature. The aim of this work is to computationally analyze a twin-jet configuration and identify the impact of plume interactions on various aspects, such as shear-layer characteristics, coherent structures, mixing, and the near acoustic field. A large-eddy simulation (LES)-based approach is employed to study a Mach 1.23 circular twin-jet configuration with an internozzle spacing of two jet diameters. In agreement with the established literature, results indicate a dominant m = 1 helical mode on both the jet plumes. In the internozzle region, mean velocity profiles indicate the formation of a secondary flow, which extends a significant influence on the shear layers in its proximity. However, this impact is confined to small azimuthal angles and, as a result, many of the potential core properties are almost similar to those of a single jet at identical flow conditions. Along the plane containing the jet centers, analysis of the near-field pressure fluctuations reveals that the twin jet exhibits suppressed levels relative to a single jet. This is ascribed to twin-jet plume bending along with reduced outer shear-layer spreading rate.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Dynamics of Closely Spaced Supersonic Jets


    Contributors:

    Published in:

    Publication date :

    2017-08-14


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    VTOL in-ground effect flows for closely spaced jets

    SICLARI, M. / HILL, JR., W. / JENKINS, R. et al. | AIAA | 1980



    Interaction Mechanisms between Closely Spaced Sprays

    Schmidt, David P. / Hou, Shuhai | SAE Technical Papers | 2008


    Measurement of Closely Spaced Point Targets

    Sandhu, G. S. / Audeh, N. F. | IEEE | 1980


    Interaction mechanisms between closely spaced sprays

    Hou,S. / Schmidt,D.P. / Caterpillar,US et al. | Automotive engineering | 2008