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The influence of shock speed variation on radiation and thermochemistry experiments in shock tubes

Published online by Cambridge University Press:  16 September 2022

Peter L. Collen Open the ORCID record for Peter L. Collen [Opens in a new window] ,
Matthew Satchell Open the ORCID record for Matthew Satchell [Opens in a new window] ,
Luca Di Mare Open the ORCID record for Luca Di Mare [Opens in a new window]  and
Matthew McGilvray Open the ORCID record for Matthew McGilvray [Opens in a new window]
Peter L. Collen*
Affiliation:
Oxford Thermofluids Institute, Southwell Building, Osney Mead, Oxford OX2 0ES, UK
Matthew Satchell
Affiliation:
Oxford Thermofluids Institute, Southwell Building, Osney Mead, Oxford OX2 0ES, UK
Luca Di Mare
Affiliation:
Oxford Thermofluids Institute, Southwell Building, Osney Mead, Oxford OX2 0ES, UK
Matthew McGilvray
Affiliation:
Oxford Thermofluids Institute, Southwell Building, Osney Mead, Oxford OX2 0ES, UK
*
†Email address for correspondence: peter.collen@eng.ox.ac.uk
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Abstract

Shock tubes are a crucial source of experimental data for the aerothermodynamic modelling of atmospheric entry vehicles. Notably, many chemical-kinetic and radiative models are validated directly against optical measurements from these facilities. Typically, the incident shock speed at the location of the experimental measurement is taken to be representative of the test slug; however, the shock velocity can vary substantially upstream of this location. These variations have been long posited as a source of disagreement with computational predictions, although a definitive link has proved elusive. This work describes a series of experiments which aim to isolate and confirm the importance of the shock deceleration effect. This is achieved by generating different shock trajectories and comparing the post-shock trends in atomic oxygen emission and electron density. These trends are shown to be directly linked to the upstream shock speed variations using a recently developed numerical tool (LASTA). The close agreement of the comparisons confirms the importance of shock speed variation for shock tube experiments; these findings have direct and potentially critical relevance for all such studies, both past and present.

JFM classification

MHD and Electrohydrodynamics: Plasmas Compressible Flows: Shock waves Compressible Flows: Hypersonic Flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 948 , 10 October 2022 , A51
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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