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Experiments in Fluids

, 55:1782 | Cite as

Schlieren-based techniques for investigating instability development and transition in a hypersonic boundary layer

  • S. J. LaurenceEmail author
  • A. Wagner
  • K. Hannemann
Research Article

Abstract

Three variants of schlieren techniques are employed to investigate the development of second-mode instability waves in the hypersonic boundary layer of a slender cone in a reflected shock tunnel. First, a previously proposed technique using high frame rate (i.e., at least as high as the dominant instability frequency) schlieren visualization with a continuous light source is shown to provide repeatable measurements of the instability propagation speed and frequency. A modified version of the technique is then introduced whereby a pulsed light source allows the use of a higher-resolution camera with a lower frame rate: this provides significant benefits in terms of spatial resolution and total recording time. A detailed picture of the surface-normal intensity distribution for individual wave packets is obtained, and the images provide comprehensive insight into the unsteady flow structures within the boundary layer. Finally, two-point schlieren deflectometry is implemented and shown to be capable of providing second-mode growth information in the challenging shock tunnel environment.

Keywords

Wave Packet Shock Tunnel Amplification Rate Hypersonic Boundary Layer Pulse Light Source 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors wish to thank the HEG staff, in particular Jan Martinez Schramm, Ingo Schwendtke, Mario Jünemann, and Sarah Trost for assistance in preparing the model and running the tunnel; we are also grateful to N. Parziale for elucidating the FLDI technique.

Supplementary material

Supplementary material 1 (wmv 36857 KB)

References

  1. Alvin F, Settles G, Weinstein L (1993) A sharp-focusing schlieren optical deflectometer. AIAA Paper No. 93–0629Google Scholar
  2. Casper K, Beresh S, Henfling J, Spillers R, Pruett B (2013a) High-speed schlieren imaging of disturbances in a transitional hypersonic boundary layer. AIAA Paper No. 2013–0376Google Scholar
  3. Casper K, Beresh S, Wagnild R, Henfling J, Spillers R, Pruett B (2013b) Simultaneous pressure measurements and high-speed schlieren imaging of disturbances in a transitional hypersonic boundary layer. AIAA Paper No. 2013–2739Google Scholar
  4. Davis M (1971) Measurements in a subsonic turbulent jet using a quantitative schlieren technique. J Fluid Mech 46:631–656CrossRefGoogle Scholar
  5. Demetriades A (1974) Hypersonic viscous flow over a slender cone, part III: Laminar instability and transition. AIAA Paper No. 74–535Google Scholar
  6. Estorf M, Radespiel R, Schneider S, Johnson H, Hein S (2008) Surface-pressure measurements of second-mode instability in quiet hypersonic flow. AIAA Paper No. 2008–1153Google Scholar
  7. Fedorov A, Tumin A (2011) High-speed boundary-layer instability: Old terminology and a new framework. AIAA J 49(8):1647–1657CrossRefGoogle Scholar
  8. Fischer M, Weinstein L (1972) Transition and hot-wire measurements in hypersonic helium flow. AIAA J 10(10):1326–1332CrossRefGoogle Scholar
  9. Fujii K (2006) Experiment of the two-dimensional roughness effect on hypersonic boundary-layer transition. J Spacecraft Rockets 43(4):731–738CrossRefGoogle Scholar
  10. Fujii K, Hornung H (2003) Experimental investigation of high-enthalpy effects on attachment-line boundary-layer transition. AIAA J 41(7):1282–1291CrossRefGoogle Scholar
  11. Garg S, Settles G (1998) Measurements of a supersonic turbulent boundary layer by focusing schlieren deflectometry. Exp Fluids 25:254–264CrossRefGoogle Scholar
  12. Hannemann K (2003) High enthalpy flows in the HEG shock tunnel: Experiment and numerical rebuilding. AIAA Paper No. 2003–978Google Scholar
  13. Hannemann K, Martinez Schramm J, Karl S (2008) Recent extensions to the High Enthalpy Shock Tunnel Göttingen (HEG). In: Proceedings of the 2nd International ARA Days “Ten Years after ARD”, Arcachon, FranceGoogle Scholar
  14. Heitmann D, Radespiel R, Knauss H (2013) Experimental study of boundary-layer response to laser-generated disturbances at Mach 6. J Spacecraft Rockets 50(2):294–304CrossRefGoogle Scholar
  15. Hofferth J, Humble R, Floryan D, Saric W (2013) High-bandwidth optical measurements of the second-mode instability in a Mach 6 quiet tunnel. AIAA Paper No. 2013–0378Google Scholar
  16. Johnson H, Seipp T, Candler G (1998) Numerical study of hypersonic reacting boundary layer transition on cones. Phys Fluids 10(10):2676–2685CrossRefGoogle Scholar
  17. Kendall J (1975) Wind tunnel experiments relating to supersonic and hypersonic boundary-layer transition. AIAA J 13(3):290–299CrossRefGoogle Scholar
  18. Laurence SJ, Wagner A, Hannemann K, Wartemann V, Lüdeke H, Tanno H, Itoh K (2012) Time-resolved visualization of instability waves in a hypersonic boundary layer. AIAA J 50(1):243–246CrossRefGoogle Scholar
  19. Mack L (1975) Linear stability theory and the problem of supersonic boundary-layer transition. AIAA J 13(3):278–289CrossRefGoogle Scholar
  20. McIntyre S, Settles G (1991) Optical experiments on axisymmetric compressible turbulent mixing layers. AIAA Paper No. 91–0623Google Scholar
  21. Parziale NJ, Shepherd JE, Hornung HG (2013a) Differential interferometric measurement of instability at two points in a hypervelocity boundary layer. AIAA Paper No. 2013–0521Google Scholar
  22. Parziale NJ, Shepherd JE, Hornung HG (2013b) Differential interferometric measurement of instability in a hypervelocity boundary layer. AIAA J 51(3):750–754CrossRefGoogle Scholar
  23. Parziale NJ, Shepherd JE, Hornung HG (2014) Free-stream density perturbations in a reflected-shock tunnel. Exp Fluids 55(1665)Google Scholar
  24. Potter J, Whitfield J (1965) Boundary-layer transition under hypersonic conditions. AGARDograph No 97, Part IIIGoogle Scholar
  25. Roediger T, Knauss H, Estorf M, Schneider S, Smorodsky B (2009) Hypersonic instability waves measured using fast-response heat-flux gauges. J Spacecraft Rockets 46(2):266–273CrossRefGoogle Scholar
  26. Settles G (2006) Schlieren and shadowgraph techniques. Springer, NYGoogle Scholar
  27. Sivasubramanian J, Fasel H (2012) Growth and breakdown of a wave packet into a turbulent spot in a cone boundary layer at Mach 6. AIAA Paper No. 2012–85Google Scholar
  28. Smith L (1994) Pulsed-laser schlieren visualization of hypersonic boundary-layer instability waves. AIAA Paper No. 94–2639Google Scholar
  29. Stetson K, Kimmel R (1992) On hypersonic boundary-layer stability. AIAA Paper No. 92–0737Google Scholar
  30. Tanno H, Komuro T, Sato K, Itoh K, Takahashi M, Fujii K (2009) Measurement of hypersonic boundary layer transition on cone models in the free-piston shock tunnel HIEST. AIAA Paper No. 2009–0781Google Scholar
  31. van Driest F, McCauley W (1960) The effect of controlled three-dimensional roughness on boundary-layer transition at supersonic speeds. J Aeronaut Sci 27(4):261–271zbMATHGoogle Scholar
  32. VanDercreek C, Smith M, Yu K (2010) Focused schlieren and deflectometry at AEDC Hypervelocity Wind Tunnel No. 9. AIAA Paper No. 2010–4209Google Scholar
  33. Wagner A, Hannemann K, Kuhn M (2013a) Experimental investigation of hypersonic boundary-layer stabilization on a cone by means of ultrasonically absorptive carbon-carbon material. Exp Fluids 54:1–10CrossRefGoogle Scholar
  34. Wagner A, Hannemann K, Wartemann V, Giese T (2013b) Hypersonic boundary-layer stabilization by means of ultrasonically absorptive carbon-carbon material, part 1: Experimental results. AIAA Paper No. 2013–270Google Scholar
  35. Wartemann V, Giese T, Eggers T, Wagner A, Hannemann K (2013) Hypersonic boundary-layer stabilization by means of ultrasonically absorptive carbon-carbon material, part 1: Computational analysis. AIAA Paper No. 2013–271Google Scholar
  36. Welch P (1967) The use of Fast Fourier Transform for the estimation of power spectra: a method based on time averaging over short, modified periodograms. IEEE T Audio Electroacoustics 15(2):70–73CrossRefMathSciNetGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Spacecraft Department, Institute of Aerodynamics and Flow TechnologyGerman Aerospace CenterGöttingenGermany
  2. 2.Department of Aerospace EngineeringUniversity of MarylandCollege ParkUSA

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