Gaseous detonation dynamics
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Gaseous detonation dynamics. Multiscale and multiphysics problem Some important critical issues Role of turbulence in chemical reaction Prediction of critical parameters Initiation energy Critical diffraction diameter Minimum tube diameter Key computational problems

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Gaseous detonation dynamics

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Gaseous detonation dynamics

Gaseous detonation dynamics

  • Multiscale and multiphysics problem

  • Some important critical issues

    • Role of turbulence in chemical reaction

    • Prediction of critical parameters

      • Initiation energy

      • Critical diffraction diameter

      • Minimum tube diameter

  • Key computational problems

    • Known but very large reaction mechanisms

    • Turbulent flow in portions of reaction zone

ASCI-ASAP Research Review October 23-24, 2002


Goals

Goals

Simulate the detonation process in three dimensions, with

viscous effects, and a realistic reaction model that represents

a fuel-oxidizer system of moderate complexity

  • Issues

    • Role of turbulence in reaction zone

    • origin of detonation substructure

    • regular vs. irregular cellular structure

    • Role of instability in:

      • Initiation

      • Diffraction

      • Interaction with structures

ASCI-ASAP Research Review October 23-24, 2002


The length scale challenge

The length scale challenge

7.4 mm

l/L = 74,000

77 mm

500 nm

Stoichiometric hydrogen-oxygen mixture at an initial pressure of 20 kPa

ASCI-ASAP Research Review October 23-24, 2002


Proposed approach

Proposed Approach

  • Detonation modeling in gases

    • Development of realistic reduced reaction models for 2D and 3D simulations – follow on to current ILDM work

    • High resolution simulations resolving instability (transverse) wave

    • Analyse canonical problems such as diffraction to develop physical insight and theories for critical parameters

    • Development approximate methods to handle mixing and Buil in turbulent regions behind front

  • Build on ongoing work in compressible turbulence

    • Viscous flow solvers for compressible flow

    • Adaptive Mesh Refinement Mesh (AMR) methods

  • Relationship to VTF

    • Detonation simulation essential component

ASCI-ASAP Research Review October 23-24, 2002


Detonation wave diffraction

Detonation Wave Diffraction

  • Detonation can fail, i.e., shock wave and reaction zone decouple during diffraction

ASCI-ASAP Research Review October 23-24, 2002


Detonation initiation by projectiles

Detonation Initiation by Projectiles

ASCI-ASAP Research Review October 23-24, 2002


Gaseous detonation dynamics

0.56 mm

Surface

Notch

Wall

Detonation propagation

41 mm

VTF Application: Detonation-driven fracture

Detonation wave direction

ASCI-ASAP Research Review October 23-24, 2002


Gaseous detonation dynamics

Validation...

ASCI-ASAP Research Review October 23-24, 2002


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