Numerical investigation of hypervelocity shock-wave/boundary-layer interactions over a double-wedge configuration

Jiaao Hao, Chih Yung Wen, Jingying Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

Hypervelocity flows of nitrogen and air over a 30–55° double-wedge configuration are numerically investigated under the condition corresponding to recent experiments conducted with total enthalpy of 8.0 MJ/kg. Time-accurate two-dimensional and three-dimensional simulations are performed to resolve the unsteady shock interaction process. For the nitrogen flow, it is found that the three-dimensional simulation predicts a much smaller separation bubble and reduced surface heat flux and pressure peaks. Good agreement can be observed with the experiments in terms of the shock location, the flow structure, and the time-averaged surface heat flux when the three-dimensional effects are considered. For the air flow, the shock interaction mechanisms are similar to those in nitrogen. The real-gas effects tend to decrease the separation bubble and reduce the standoff distance of the detached shock induced by the second wedge, leading to a lower surface heat flux peak compared with the nitrogen result. However, the trend of the experimental heat flux data shows the opposite. To explain the discrepancies, effects of thermochemical nonequilibrium models are investigated. The results indicate that the air flow under the current condition is insensitive to air chemistry and vibration–dissociation coupling models. Suggestions for further study are presented.

Original languageEnglish
Pages (from-to)277-292
Number of pages16
JournalInternational Journal of Heat and Mass Transfer
Volume138
DOIs
Publication statusPublished - Aug 2019

Keywords

  • Hypersonic
  • Shock-wave/boundary-layer interaction
  • Thermochemical nonequilibrium
  • Vibration–dissociation coupling

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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