Abstract The flow physics aspects of parallel sonic transverse gaseous injections in a Ma = 2.95 supersonic crossflow are experimentally investigated in this study. NPLS (Nanoparticle-based Planar Laser Scattering) and oil flow techniques are employed for qualitative comparison. Under the supersonic crossflow with jet-to-crossflow momentum flux ratio (J) of 7.7, the NPLS images reveal the shock structures, K–H vortex and slip lines on different spanwise planes of each of the experimental conditions, and the oil flow experiments illustrate the bow shocks, separation zones and other interactions in the near-wall region. Furthermore, the fractal dimensions of the jets mainstream region are given to analyze the turbulent intensity. The interaction mechanism of the flow field is completely different with the distances of the orifices growing. As the orifices are close together, the flow structures of three orifices, including bow shocks, separation zone, horseshoe vortex and jet mainstreams, almost merge into one. With the distances between jets growth, the bow shocks would merge into a normal shock and the separation zones interact with each other. When the distances between jets are large enough, the jet mainstreams are independent, while the bow shocks interact with each other forming a complex shock system. The interactions between jets promote the development of turbulence in general, while the interactions between too close jets would restrict the development of turbulence. In addition, the horseshoe vortex and the shedding vortex are analyzed.

    Highlights This study experimentally investigates the flow structures of parallel sonic transverse injections. NPLS images provides a good visualization of shock and vortex structures. Oil-flow technique provides a good visualization of near-wall flowfield. Fractal dimensions are analyzed to evaluate the turbulence intensity.


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    Titel :

    Experimental study of parallel injections with different distances into a supersonic crossflow


    Beteiligte:
    Liang, Chang-hai (Autor:in) / Sun, Ming-bo (Autor:in) / Wang, Qian-cheng (Autor:in) / Liu, Yuan (Autor:in) / Yang, Yi-xin (Autor:in) / Sun, Yong-chao (Autor:in) / Li, Guang-xin (Autor:in)

    Erschienen in:

    Acta Astronautica ; 168 ; 242-248


    Erscheinungsdatum :

    2019-12-13


    Format / Umfang :

    7 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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