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Background oriented schlieren for flow visualisation in hypersonic impulse facilities

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Abstract

Experiments to demonstrate the use of the background-oriented schlieren (BOS) technique in hypersonic impulse facilities are reported. BOS uses a simple optical set-up consisting of a structured background pattern, an electronic camera with a high shutter speed and a high intensity light source. The visualization technique is demonstrated in a small reflected shock tunnel with a Mach 4 conical nozzle, nozzle supply pressure of 2.2 MPa and nozzle supply enthalpy of 1.8 MJ/kg. A 20° sharp circular cone and a model of the MUSES-C re-entry body were tested. Images captured were processed using PIV-style image analysis to visualize variations in the density field. The shock angle on the cone measured from the BOS images agreed with theoretical calculations to within 0.5°. Shock standoff distances could be measured from the BOS image for the re-entry body. Preliminary experiments are also reported in higher enthalpy facilities where flow luminosity can interfere with imaging of the background pattern.

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References

  1. Richard H., Raffel M. (2001). Principle and applications of the background oriented schlieren (BOS) method. Meas. Sci. Tech. 12: 1576–1585

    Article  Google Scholar 

  2. Meier G.E.A. (2002). Computerized background-oriented schlieren. Exp. Fluids 33: 181–187

    Article  Google Scholar 

  3. Elsinga G.E., van Oudhuesden B.W., Scarano F., Watt D.W. (2004). Assessment and application of quantitative schlieren methods: calibrated color schlieren and background oriented schlieren. Exp. Fluids 36: 309–325

    Article  Google Scholar 

  4. Merzkirch W. (1974). Flow Visualization. Academic, New York

    MATH  Google Scholar 

  5. Willert C.E., Gharib M. (1991). Digital particle image velocimetry. Exp. Fluids 10: 181–193

    Article  Google Scholar 

  6. Rösgen T. (2003). Optimal subpixel interpolation in particle image velocimetry. Exp. Fluids 35: 252–256

    Article  Google Scholar 

  7. Austin, J.M., Jacobs, P.A., Kong, M.C., Barker, P., Littleton, B.N., Gammie, R.: The small shock tunnel facility at UQ. Department of Mechanical Engineering, The University of Queensland, Research Report 2/97, July (1997)

  8. Krek, R.M., Jacobs, P.A.: STN, Shock Tube and Nozzle Calculations for equibrilibrium air. Department of Mechanical Engineering, The University of Queensland, Research Report 2/93, February (1997)

  9. Kawaguchi J., Uesugi K.T., Fujiwara A., Saitoh H. (1999). The MUSES-C, mission description and its status. Acta Astronaut. 45(4): 397–405

    Article  Google Scholar 

  10. Stalker, R.J., Morgan, R.G.: The University of Queensland Free Piston Shock Tunnel T4—Initial Operation and Preliminary Calibration. Fourth National Space Engineering Symposium, Adelaide, Australia, IEAust (1988)

  11. Morgan, R.G.: Development of X3, a superorbital expansion tube. Paper AIAA-2000-558. Presented at the AIAA 38th Aerospace Sciences Meeting and Exhibit, Reno, NV, January 10–13 (2000)

  12. Taylor G.I., Maccoll J.W. (1933). The air pressure on a cone moving at high speeds. Proc. Roy. Soc. A 139(838): 278–311

    MATH  Google Scholar 

  13. Jacobs, P.A.: MB CNS, a computer program for the simulation of transient compressible flow. Department of Mechanical Engineering, The University of Queensland, Research Report 10/96 (1996)

  14. Venkatakrishnan L., Meier G.E.A. (2004). Density measurements using the background oriented schlieren technique. Exp. Fluids 37(2): 237–247

    Article  Google Scholar 

  15. Spencer R.L., Braun R.D. (1996). Mars pathfinder atmosphertic entry—trajectory design and dispersion analysis. J. Spacecr. Rocket. 31: 670–676

    Article  Google Scholar 

  16. Paull A., Stalker R.J., Mee D.J. (1995). Experiments on supersonic combustion ramjet propulsion in a shock tunnel. J. Fluid Mech. 296: 159–183

    Article  Google Scholar 

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Correspondence to D. J. Mee.

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Communicated by F. Lu.

A version of this paper was presented at the 25th International Symposium on Shock Waves in Bangalore in July 2005.

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Ramanah, D., Raghunath, S., Mee, D.J. et al. Background oriented schlieren for flow visualisation in hypersonic impulse facilities. Shock Waves 17, 65–70 (2007). https://doi.org/10.1007/s00193-007-0097-7

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  • DOI: https://doi.org/10.1007/s00193-007-0097-7

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