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Temperature measurements in a hypersonic gun tunnel using a modified line-reversal method

Published online by Cambridge University Press:  28 March 2006

E. G. Brown-Edwards
E. G. Brown-Edwards
Affiliation:
Aeronautical Research Institute of Sweden (FFA), Bromma, Sweden
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Abstract

Temperature measurements in the test section of a hypersonic gun tunnel using a modified line-reversal two-beam optical pyrometer have been performed. Measurements were made in the shock layer at the front of an ‘end-on’ flat-faced cylinder using argon or air as the driven gas. The measured temperatures were greater than the calculated isentropic temperatures but much less than the originally predicted shock-heated values. The experimental values agreed reasonably well with the theoretical temperatures for shock-heated air corrected for boundary-layer and heat-loss effects in the gun barrel and also with previously reported experimental values found using heat-transfer methods. Preliminary studies of the vibrational relaxation of nitrogen and air in the test section have been carried out using a flat-sided ‘relaxation’ tube (a Pitot tube with glass windows). They demonstrated the feasibility of this approach.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 27 , Issue 3 , 24 February 1967 , pp. 493 - 501
Copyright
© 1967 Cambridge University Press

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References

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