Affiliations: School of Mechanical and Aerospace Engineering,
College of Engineering, Seoul National University, San 56-1 Shinlim-dong,
Kwanak-gu, Seoul 151-742, Korea | Department of Aerospace Engineering, Korea Advanced
Institute of Science and Technology, 373-1 Kusong-dong, Yusung-gu, Teajon
305-701, Korea
Abstract: Unsteady compressible flow fields past a wedge and a cone, evolved
by propagation and interaction of shock waves, slip lines, and vortices, are
studied by shadowgraphs and holographic interferograms taken during the shock
tube experiment. The supplementary numerical calculation also presented
time-accurate solution of the shock wave physics which was essential to
recognize the similarity and dissimilarity between the wedge and the conical
flows. The decelerated shock detained by the vortex interacts with the small
vortexlets along the slip layer, producing diverging acoustics: this phenomenon
is more distinct in the case of wedge flow for a given shock Mach number. The
decelerated shock penetrated through the vortex core constitutes a transmitted
shock, which eventually merges with the diaphragm shock that bridges the vortex
pair/vortex ring. This phenomenon became remarkably salient in the case of
conical flow.