Capturing unstable wrinkled oblique detonation wave front by Hi-Fi numerical simulation

Jeong Yeol Choi, Don Wan Kim, In Seuck Jeung, Vigor Yang, Ma Fuhua

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Numerical studies were carried out to investigate the cell-like unsteady structure of oblique detonation wave (ODW) with the systematical examination of the effect of grid resolutions, To focus on the effect of activation energy, computations were carried out for a fixed flow condition of Mach number 7 flow over wedge of 30° turning angle with dimensionless heat addition of 10.0, The ODW front remains stable for low activation energy cases regardless of grid resolution, but becomes unstable for high activation energies resulting cell-like wave front structure. Similarly to ordinary normal detonation wave (NDW), intermediate activation energy results in regular oscillation, but higher one results in irregular oscillation, However, the wave structure of unstable ODW was quite different from NDW. Triple points and transverse waves propagate downstream only for the present flow conditions, and numerically simulated smoked foil record exhibits several traces of triple points those rarely intersects with each other. Several sources of the instability were conjectured from the highly refined results. Since the reaction wave behind a shock wave becomes unstable easily by any disturbances, ODW front becomes unstable and results in cell-like front structures by vorticity generated pressure waves and/or the reflected shock wave originating from the triple point. The combined effects of the different sources of instabilities exhibit highly unstable and very complex flow field behind the unstable ODW.

Original languageEnglish
Title of host publicationCollection of Technical Papers - AIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
Pages7463-7469
Number of pages7
ISBN (Print)1563478188, 9781563478185
Publication statusPublished - 2006
EventAIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference - Sacramento, CA, United States
Duration: 2006 Jul 92006 Jul 12

Publication series

NameCollection of Technical Papers - AIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference
Volume9

Other

OtherAIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference
CountryUnited States
CitySacramento, CA
Period06-07-0906-07-12

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Energy(all)
  • Aerospace Engineering
  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering

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