slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Visualizing Detonation Diffraction PowerPoint Presentation
Download Presentation
Visualizing Detonation Diffraction

Loading in 2 Seconds...

play fullscreen
1 / 9

Visualizing Detonation Diffraction - PowerPoint PPT Presentation


  • 114 Views
  • Uploaded on

Visualizing Detonation Diffraction. Experiments: F. Pintgen , J.E.Shepherd Simulations: M. Arienti, R. Deiterding ASC RESEARCH REVIEW MAY 12-13 , 2004. Experimental Set up. 2H2+O2+68%Ar. subcritical:. Experimental Set up. Excimer pumped dye laser, 5mJ/pulse

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Visualizing Detonation Diffraction' - aldis


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Visualizing Detonation Diffraction

Experiments: F. Pintgen, J.E.Shepherd

Simulations: M. Arienti, R. Deiterding

ASC RESEARCH REVIEWMAY 12-13 , 2004

experimental set up
Experimental Set up

2H2+O2+68%Ar

subcritical:

experimental set up1
Experimental Set up
  • Excimer pumped dye laser, 5mJ/pulse
  • ICCD camera, Gate width 40ns
  • Schlieren system light source: 50ns ruby laser pulse
  • PLIF and Schlieren image obtained within 100ns
subcritical case
Subcritical case

Image-height

50mm

Multiple shots with 6ms delay increase

Straight portion of leading, still shock coupled, reaction front gradually decouples

2H2+O2+7Ar

1bar

detonation

centerline

tube

critical case
Critical case

shot 37

shot 38

2H2+O2+66%Ar, 1bar

image-height: 150mm

PLIF image taken 70ns after Schlieren image

critical case1
critical case

2H2+O2+66%Ar

1bar

image-height

50mm

Keystone shaped reaction front features mainly pointing away from the axis of symmetry

shot 37

shot 38

shot 40

shot 42

comparison with simulation
Comparison with simulation

Keystone-shaped reaction front features mainly pointing away from the axis of symmetry.

Contrast with “Classical” keystone in fully developed detonation

R. Deiterding,

PhD thesis, Brandenburgische Technische Universiät Cottbus, 2003

AMROC simulation

2H2+O2+70%Ar

10kPa

l=16mm, D/l=8

comparison with simulation1
Comparison with simulation

image-height

130mm

flow direction

Reaction front propagating transversely into shocked but unreacted region

  • Marco Arienti:
  • Single step reaction
  • Perfect gas Equation of State
  • 6750 x 5858 grid points

2H2+O2+22%N2

100kPa

qCJ = 6.8

Activation energy

qCJ = 3.5

future work
Future work
  • Extend experimental studies to more irregular mixtures, with higher activation energy
  • Measure experimentally decaying shock velocity to get a better quantitative comparison with simulations
  • Revisit tube fracture problem with visualization of fluid dynamics and focus on fluid-solid coupling