Characteristics of shock tube generated compressible vortex rings at very high shock Mach numbers
نویسندگان
چکیده
Compressible vortex rings are usually formed at the open end of a shock tube. They show exciting flow phenomena during their formation, evolution, and propagation depending on Mach number (Ms) exit conditions. This study considers high tube pressure ratio (PR) cases showing hitherto unknown, spectacular structures. With hydrogen as driver section gas PR, supersonic compressible ring having (Mv) >1 is obtained for first time. The formation multiple triple points corresponding slipstream shear layers and, thus, counter-rotating (CRVRs) behind primary different radial locations, in addition to usual CRVRs, appears be unique characteristic rings. During stage, layer reverse circulation than that gets generated from outer wall instability such creates another series opposite vortices, which later interfere with core considerably. Also, near stationary fast-moving tiny vortices observed central zone. Mechanisms these complex vortical structures identified. implications ring's geometric kinematic characteristics, diameter, circulation, translational velocity, discussed detail, illustrating differences low considering 0.31 < Mv 1.08.
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ژورنال
عنوان ژورنال: Physics of Fluids
سال: 2021
ISSN: ['1527-2435', '1089-7666', '1070-6631']
DOI: https://doi.org/10.1063/5.0063164