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Experiments in Fluids

, 58:32 | Cite as

Turbulent spots in hypervelocity flow

  • Joseph S. JewellEmail author
  • Ivett A. Leyva
  • Joseph E. Shepherd
Research Article

Abstract

The turbulent spot propagation process in boundary layer flows of air, nitrogen, carbon dioxide, and air/carbon dioxide mixtures in thermochemical nonequilibrium at high enthalpy is investigated. Experiments are performed in a hypervelocity reflected shock tunnel with a 5-degree half-angle axisymmetric cone instrumented with flush-mounted fast-response coaxial thermocouples. Time-resolved and spatially demarcated heat transfer traces are used to track the propagation of turbulent bursts within the mean flow, and convection rates at approximately 91, 74, and 63% of the boundary layer edge velocity, respectively, are observed for the leading edge, peak, and trailing edge of the spots. A simple model constructed with these spot propagation parameters is used to infer spot generation rates from observed transition onset to completion distance. Spot generation rates in air and nitrogen are estimated to be approximately twice the spot generation rates in air/carbon dioxide mixtures.

Keywords

Mach Number Direct Numerical Simulation Spreading Angle Shock Tunnel Transition Onset 
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

Acknowledgements

The authors would like to thank Bahram Valiferdowsi (California Institute of Technology) and Nick Parziale (Stevens Institute of Technology) for assistance running T5, and Ross Wagnild (Sandia National Laboratories) for help with the program to compute run conditions. Hans Hornung (California Institute of Technology) suggested animating the heat-transfer contours and Thomas Juliano (Notre Dame) provided advice on exporting movies.

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Copyright information

© Springer-Verlag Berlin Heidelberg (outside the USA) 2017

Authors and Affiliations

  1. 1.U.S. Air Force Research Laboratory, AFRL/RQHFWright-Patterson AFBUSA
  2. 2.U.S. Air Force Office of Scientific Research, AFOSR/RTEArlington AFBUSA
  3. 3.Graduate Aerospace LaboratoriesCalifornia Institute of TechnologyPasadenaUSA

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