Control of a Mach 2 elliptic jet from a convergent-divergent elliptic nozzle of Aspect Ratio 3, with rectangular and triangular tabs of identical blockage, was studied experimentally at different levels of pressure gradient at the nozzle exit. At all levels of pressure gradient studied in this work, irrespective of tab geometry, the tabs along the minor axis promoted mixing and the tabs along the major axis retarded mixing. However, the level of mixing was sensitive to the tab geometry. The triangular tabs along the minor axis caused greater mixing than the rectangular tabs at all pressure gradients. The triangular tabs along the minor axis caused a maximum core length reduction of 77% at a Nozzle Pressure Ratio (NPR) 4 and a minimum of 64% at NPR 5. The maximum and minimum core length reductions caused by the rectangular tabs along the minor axis were 39%, at NPR 6 and 20%, at NPRs 5 and 8. Shadowgraphs of the jet show that the waves in the core were rendered weak by both rectangular and triangular tabs when placed along the minor axis.


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    Title :

    Control of Elliptic Supersonic Jet of Aspect Ratio 3


    Contributors:

    Published in:

    Publication date :

    2017-05-31




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown



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