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Mix experiments using a two-dimensional convergent shock-tube

Published online by Cambridge University Press:  03 March 2004

D.A. HOLDER ,
A.V. SMITH ,
C.J. BARTON  and
D.L. YOUNGS
D.A. HOLDER
Affiliation:
Atomic Weapons Establishment, Reading, Berkshire, United Kingdom
A.V. SMITH
Affiliation:
Atomic Weapons Establishment, Reading, Berkshire, United Kingdom
C.J. BARTON
Affiliation:
Atomic Weapons Establishment, Reading, Berkshire, United Kingdom
D.L. YOUNGS
Affiliation:
Atomic Weapons Establishment, Reading, Berkshire, United Kingdom
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Abstract

This article reports the first Richtmyer–Meshkov instability experiments using an improved version of the Atomic Weapons Establishment convergent shock tube. These investigate the shock-induced turbulent mixing across the interfaces of an air/dense gas/air region. Multipoint ignition of a detonatable gas mixture produces a cylindrically convergent shock that travels into a test cell containing the dense gas region. The mixing process is imaged with shadowgraphy. Sample results are presented from an unperturbed experiment and one with a notch perturbation imposed on one of the dense gas interfaces. The unperturbed experiment shows the mixing across the dense gas boundaries and the motion of the bulk dense gas region. Imposition of the notch perturbation produces a mushroom-shaped air void penetrating the dense gas region. Three-dimensional simulations performed using the AWE TURMOIL3D code are presented and compared with the sample experimental results. A very good agreement is demonstrated. Conducting these first turbulent mixing experiments has highlighted a number of areas for future development of the convergent shock-tube facility; these are also presented.

Keywords

Compressible turbulent mixingConvergent shock tubeLaser sheet techniqueRichtmyer–Meshkov instability
Type
Research Article
Information
Laser and Particle Beams , Volume 21 , Issue 3 , July 2003 , pp. 403 - 409
Copyright
© 2003 Cambridge University Press

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References

REFERENCES

Holder, D.A., Smith, A.V., Philpott, M.K., & Millar, D.B. (1999). First mix experiments on the AWE convergent shock tube. Proc. 7th Int. Workshop on the Physics of Compressible Turbulent Mixing. (Meshkov, E., Yanilkin, Yu. & Zhmailo, V., Eds.). pp. 28–32. Sarov, Russia: RFNC-VNITEF.
Holder, D.A., Smith, A.V., & Youngs, D.L. (2003). Shock tube experiments on Richtmyer–Meshkov instability growth using an enlarged double bump perturbation. Laser Part. Beams 21, 411–418.Google Scholar
Smith, A.V., Holder, D.A., Philpott, M.K., & Millar, D.B. (1999). Notch and double bump experiments using the 200 × 100 mm linear shock tube. Proc. 7th Int. Workshop on the Physics of Compressible Turbulent Mixing. (Meshkov, E., Yanilkin, Yu. & Zhmailo, V., Eds.). pp. 124–130. Sarov, Russia: RFNC-VNITEF.