The Production of Converging Polygonal Shock Waves by Means of Reflectors and Cylindrical Obstacles
2006 (English)In: Flow Dynamics / [ed] Tokuyama, M; Maruyama, S, 2006, Vol. 832, 445-449 p.Conference paper (Refereed)
Converging and reflecting strong shock waves are investigated experimentally in a horizontal co-axial shock tube. The shock tube has a test section mounted at the end of the tube. Two different methods to produce various geometrical shapes of shock waves are tested. In the first method the reflector boundary of the test section is exchangeable and four different reflectors are used: a circle, a smooth pentagon, a heptagon and an octagon. It is shown that the form of the converging shock wave is influenced both by the shape of the reflector boundary and by the nonlinear dynamics between the shape of the shock and the velocity of the shock front. Further, the reflected outgoing shock wave is affected by the shape of the reflector through the flow ahead of the shock front. In the second method we use cylindrical obstacles, placed in the test section at various positions and patterns, to create disturbances in the flow that will shape the shock wave. It is shown that it is possible to shape the shock wave in a desired way with these obstacles. The influence of the supports of the inner body of the co-axial shock tube is also investigated. A square shaped shock wave is observed close to the center of convergence for the circular and octagonal reflectors but not in any other setups. This square-like shape is believed to be caused by the supports for the inner body.
Place, publisher, year, edition, pages
2006. Vol. 832, 445-449 p.
, AIP CONFERENCE PROCEEDINGS, ISSN 0094-243X ; 832
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-7429DOI: 10.1063/1.2204539ISI: 000237700400083ScopusID: 2-s2.0-33845448117ISBN: 0-7354-0324-4OAI: oai:DiVA.org:kth-7429DiVA: diva2:12454
2nd International Conference on Flow Dynamics Location: Sendai, JAPAN Date: NOV 16-18, 2005
QC 20100707. Previous title: The production of strong converging shocks2007-08-312007-08-312011-10-05Bibliographically approved