Abstract
High-speed imaging has a long history in the field of shock wave research, but only in the last two decades has it become a frequently used diagnostic tool, primarily through the availability of powerful, compact and user-friendly digital high-speed cameras. In this research field, the high-speed imaging must usually be combined with an adequate visualisation method to make the shock waves and their flow fields visible. This chapter gives an overview of the used visualisation techniques and cameras. A few examples of applications are presented that highlight the potential but also the limitations of the available techniques to obtain time-resolved visualisations of compressible flows.
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Notes
- 1.
The issue of minuscule shock waves will be briefly discussed in Sect. 4.
- 2.
The exact transition angle for this shock Mach number is \( 42.7^{ \circ } \) polar angle or \( 47.3^{ \circ } \) wall angle, respectively, where wall angle and polar angle are complementary angles for \( 90^{ \circ } \).
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Acknowledgements
Most of the work presented here would not have been possible without the support by many colleagues and friends. I would like to acknowledge in particular the contributions of em. Prof. John Dewey (University of Victoria, Canada), Prof. T. Goji Etoh (Ritsumeikan University, Japan), Prof. Koju Hiraki (Kyushu Institute of Technology), Prof. Herbert Olivier (RWTH Aachen University, Germany), Prof. Gary Settles (Penn State University, USA), Prof. Beric Skews (University of the Witwatersrand, South Africa) and Prof. Kazuyoshi Takayama (Tohoku University, Japan), who all inspired and supported many of the experiments I had the privilege to conduct. I am also indebted to em. Prof. Hans Grönig (RWTH Aachen University, Germany), who introduced me to the exciting field of compressible flows and their visualisation. Last, but not least, I would like to express my thanks for the excellent technical support I have received over the last years from members of the SEIT Mechanical Workshop, in particular from Stuart Gay and Michael Jones.
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421713_1_En_6_MOESM1_ESM.mpg
Laboratory explosions visualised by omnidirectional schlieren: reflection of the blast wave generated by a 10Â mg charge of silver azide for a height of burst of 35Â mm; frame rate: 500,000Â fps (MPG 425 kb)
421713_1_En_6_MOESM2_ESM.mpg
Omnidirectional schlieren visualisation with front lighting of a rifle bullet flying at M∞ = 1:07; frame rate: 500,000 fps (MPG 921 kb)
421713_1_En_6_MOESM3_ESM.mpg
Shearing interferometry visualisation of a shock wave (MS = 1:33) interacting with a diamond cylinder; frame rate: 460,000Â fps (MPG 2685 kb)
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Kleine, H. (2018). High-Speed Imaging of Shock Waves and Their Flow Fields. In: Tsuji, K. (eds) The Micro-World Observed by Ultra High-Speed Cameras. Springer, Cham. https://doi.org/10.1007/978-3-319-61491-5_6
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