An experimental investigation of the mean flow and turbulence characteristics of two Mach 1.5 heated jets (one with a uniform temperature profile and another with an offset nonuniform temperature profile) is presented. The thermal nonuniformity is generated by introducing a matched static pressure stream of low-temperature air into the subsonic, converging section of a round contoured supersonic nozzle. The secondary plume, which is offset radially from the geometric centerline of the round jet nozzle, produces a jet with an altered velocity profile, modifying the turbulence throughout the jet plume. On the side of the jet where the cooler stream is introduced, the near-nozzle peak velocity is reduced to 83% of the heated jet exit velocity, which is associated with a reduction in the measured peak turbulent stress levels in the region between three to six jet diameters from the nozzle exit. Several aspects of the mean flow and turbulence structure in the developing plume with temperature nonuniformity are similar to those seen in multistream coannular round jets with offset nozzles, indicating that alternative engineering approaches may be available for generating the characteristics of offset plumes desirable for jet noise reduction.


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    Title :

    Mean Flow and Turbulence of a Heated Supersonic Jet with Temperature Nonuniformity


    Contributors:

    Published in:

    AIAA Journal ; 57 , 8 ; 3493-3500


    Publication date :

    2019-05-24


    Size :

    8 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English