Nils T. Basse, C. Kissing, R. Bini, M. Seeger, P. Stoller, T

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Presentation transcript:

Nils T. Basse, C. Kissing, R. Bini, M. Seeger, P. Stoller, T Nils T. Basse, C. Kissing, R. Bini, M. Seeger, P. Stoller, T. Votteler and B. Wüthrich Measurement of 3D turbulent mixing in a small-scale circuit breaker model ABB Corporate Research Center, Baden-Dättwil, Switzerland © ABB 23 April 2017 | Slide 1 XVIII GD, Greifswald, Germany, 2010

Outline How does a self-blast gas circuit breaker work? Earlier studies and open questions Optical setup and test device Discharges Shadowgraphy movies Streamlines from velocimetry Conclusions and outlook © ABB 23 April 2017 | Slide 2

How does a self-blast gas circuit breaker work? © ABB 23 April 2017 | Slide 3

Earlier studies and open questions Mixing in 2D slab geometries: R.Bini et al.,”Measured and simulated SF6 mixing behaviour”, GD 2010 (A2 Monday 3:00 pm) R.Bini et al., ”Arc-induced turbulent mixing in a volume filled with SF6”, submitted to J.Phys.D: Appl. Phys. 2010 N.P.T.Basse et al., ”Measured turbulent mixing in a small-scale circuit breaker model”, Applied Optics 2009 Open questions: Diagnostics: Can we use Fresnel lenses? Mixing: What changes from 2D to 3D? © ABB 23 April 2017 | Slide 4

Optical setup 18 µs between frames, 1 µs exposure time 128 (width) × 256 (height) pixels 1 pixel = 0.6 mm © ABB 23 April 2017 | Slide 5

Test device Left: Picture of experimental setup Right: Sketch of heating volume cuboid Current path Heating volume Arc zone 50.4 mm © ABB 23 April 2017 | Slide 6

Discharges Left: Current Right: Arc voltage © ABB 23 April 2017 | Slide 7

Discharges Left: Arc zone pressure Right: Heating volume pressure © ABB 23 April 2017 | Slide 8

Shadowgraphy movies © ABB 23 April 2017 | Slide 9

Streamlines from velocimetry © ABB 23 April 2017 | Slide 10

Streamlines at CZ © ABB 23 April 2017 | Slide 11

Conclusions 3D mixing experiments have been done in air at 1 bar It is possible to perform velocimetry on images recorded with Fresnel lenses Mixing pattern at CZ: Low current: One vortex High current: Several vortices © ABB 23 April 2017 | Slide 12

Outlook Future work: Diagnostics: Test devices: Phase-contrast imaging to (i) increase sensitivity and (ii) measure absolute density Use high quality optical components to optimise images Test devices: Heating volume cuboid, fixed contacts (ignition wire): Asymmetries (current path, manufacturing inaccuracies etc.) Other gases, fill pressures, arcing times, geometries Christopher Kissing: RFH Köln, M.Sc. Thesis work Heating volume cylinder, moving contacts: Roger Wiget: ETH Zürich, M.Sc. Thesis work © ABB 23 April 2017 | Slide 13

Repeat shots: Low current movies © ABB 23 April 2017 | Slide 15

Repeat shots: Low current streamlines © ABB 23 April 2017 | Slide 16

Low current streamlines at CZ © ABB 23 April 2017 | Slide 17

Repeat shots: High current movies © ABB 23 April 2017 | Slide 18

Repeat shots: High current streamlines © ABB 23 April 2017 | Slide 19

High current streamlines at CZ © ABB 23 April 2017 | Slide 20