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.
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References
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Author Profile Se-Myong Chang: He earned his Ph.D. degree from Korea Advanced Institute of Science and Technology (KAIST) in 2000 under the supervision of Prof. Keun-Shik Chang. He now works as Brain-Korea-21 Post-doctoral Fellow at Seoul National University. His research fields are shock-vortex interaction, computational aero-acoustics and experiment of high-speed flow.
Keun-Shik Chang: He finished his academic discipline of Ph.D. at the University of California, Berkeley in 1977, and NRC Research Associateship at NASA-Ames Research Center in 1978. He has since served as a professor of Department of Aerospace Engineering in Korea Advanced Institute of Science and Technology (KAIST). He is the founder of Korean Society of Computational Fluids Engineering (KSCFE). His research interests are in engineering flow computation and shock wave experiment. He has published hundredsome international journal and conference papers.
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Chang, S.M., Chang, K.S. Visualization of shock-vortex interaction radiating acoustic waves. J Vis 3, 221–228 (2000). https://doi.org/10.1007/BF03181844
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DOI: https://doi.org/10.1007/BF03181844