CCD camera

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Sample. Fringe. Combustion chamber. PMMA : 60mm x 10mm x 15 , 50 , 125 m m. Honeycomb. Vane. N 2 port. Igniter (Ni-Cr wire). Fan&Motor. O 2 port. Vacuum pump port. Closed type wind tunnel (34cm x 19cm x 10cm). Sample holder. CCD camera. CCD camera. He-Ne laser. - PowerPoint PPT Presentation

Text of CCD camera

  • Schematic of experimental apparatus and interferometer system

  • Video cameraSample holder(sample size: 6cm x 1cm)Fan & MotorIgnite the sample 1.6 sec before mG.Remove the igniter 0.3sec before mG. Details of sample holder and typical sequence of drop experiments

  • AssembleMove to the drop shaftClose the capsuleAttach the transceiverReady to dropMGLAB100m drop2134

  • The minimal value appears at Vg~-6cm/sThe minimal value appears at Vg~-3cm/sThe minimal value appears at Vg~0cm/sThe hydrodynamic constant, ch,FP, was determined by matching the computed and predicted spread rates.t: 15mmt: 50mmt: 125mm(Eq. 7)Flame spread rate in microgravity with varying t,Vg and O2 level(26th International Symposium on Combustion)

    Opposed flow velocity (mm/s)

    150

    90

    60

    30

    0

    Veqv estimated by Eq. 7 (mm/s)

    30.84

    21.02

    15.51

    9.22

    0

  • Dimensionless spread rate vs. dimensionless relative flow velocityO2: 50%O2: 30%O2: 21%Dimensionless radiation parameter, R

    Thickness

    15m

    Thickness

    50m

    Thickness

    125m

    O2 level: 21%

    0.24

    0.8

    2.0

    O2 level: 30%

    0.11

    0.38

    0.95

    O2 level: 50%

    0.04

    0.14

    0.34

  • Vf+Veqv ~10mm/secVf+Veqv ~65mm/secSizes of the preheat zone in microgravity and in normal gravityMicro-gravityQuiescent conditionThickness: 50mmO2 level: 50%Normal-gravityQuiescent conditionThickness: 50mmO2 level: 50%Buoyant flow

  • Histories of temperature field near the flame frontQuiescent conditionThickness: 125mmO2 level: 30%Quiescent conditionThickness: 50mmO2 level: 50%The fringes move the opposed direction to that of flame spread, which implies that temperature is decreasing in time, thus unsteady.The fringes move to the same direction that the flame moves, and it implies that the steady temperature field is achieved.PhotoSketchPhotoSketchR=0.95R=0.14

  • Opposed flow: Vg=0 Thickness: 50 mmO2 level: 50%Pressure 1 atmFuel: Thin PMMAData from 4.5 s MGLAB Drop Tower Quiescent Environment, Steady SpreadInterferometer Video, Side View CCD Video, Top View

    Opposed flow velocity (mm/s)

    15 micro-m

    O2: 50%

    50 micro-m

    O2: 50%

    125 micro-m

    O2: 50%

    15 micro-m

    O2: 30%

    50 micro-m

    O2: 30%

    125 micro-m

    O2: 30%

    15 micro-m

    O2: 21%

    50 micro-m

    O2: 21%

    -150

    38.16

    -

    -

    23.29

    -

    -

    -

    -

    -90

    31.15

    9.58

    3.75

    15.09

    5.51

    2.14

    Extinct

    4.64

    -60

    33.14

    8.73

    3.48

    12.69

    4.59

    1.9

    Extinct

    Extinct

    -30

    33.96

    7.50

    3.17

    14.79

    3.46

    2.16

    Extinct

    fail to ignite

    0

    38.91

    9.48

    1.78

    16.26

    4.61

    1.23

    Extinct

    Extinct

    30

    42.62

    10.27

    3.58

    19.29

    5.5

    3.16

    Extinct

    fail to ignite

    60

    44.74

    11.65

    4.23

    21.79

    6.28

    2.96

    9.25

    2.18

    90

    42.86

    11.43

    4.23

    24.13

    6.71

    2.59

    9.78

    3.24

    150

    49.29

    12.74

    5.1

    23.65

    6.18

    2.89

    11.86

    3.34

  • Opposed flow: Vg=0 Thickness: 125 mmO2 level: 30%Pressure 1 atmFuel: Thin PMMAData from 4.5 s MGLAB Drop Tower Quiescent Environment - ExtinctionInterferometer Video, Side View CCD Video, Top View

    Opposed flow velocity (mm/s)

    15 micro-m

    O2: 50%

    50 micro-m

    O2: 50%

    125 micro-m

    O2: 50%

    15 micro-m

    O2: 30%

    50 micro-m

    O2: 30%

    125 micro-m

    O2: 30%

    15 micro-m

    O2: 21%

    50 micro-m

    O2: 21%

    -150

    38.16

    -

    -

    23.29

    -

    -

    -

    -

    -90

    31.15

    9.58

    3.75

    15.09

    5.51

    2.14

    Extinct

    4.64

    -60

    33.14

    8.73

    3.48

    12.69

    4.59

    1.9

    Extinct

    Extinct

    -30

    33.96

    7.50

    3.17

    14.79

    3.46

    2.16

    Extinct

    fail to ignite

    0

    38.91

    9.48

    1.78

    16.26

    4.61

    1.23

    Extinct

    Extinct

    30

    42.62

    10.27

    3.58

    19.29

    5.5

    3.16

    Extinct

    fail to ignite

    60

    44.74

    11.65

    4.23

    21.79

    6.28

    2.96

    9.25

    2.18

    90

    42.86

    11.43

    4.23

    24.13

    6.71

    2.59

    9.78

    3.24

    150

    49.29

    12.74

    5.1

    23.65

    6.18

    2.89

    11.86

    3.34

  • Data from 4.5 s MGLAB Drop Tower Flow Reversal, 50 mm thick, 30% O2, 1 atm Vg=30 mm/sVg=0Vg=-30 mm/s

    Opposed flow velocity (mm/s)

    15 micro-m

    O2: 50%

    50 micro-m

    O2: 50%

    125 micro-m

    O2: 50%

    15 micro-m

    O2: 30%

    50 micro-m

    O2: 30%

    125 micro-m

    O2: 30%

    15 micro-m

    O2: 21%

    50 micro-m

    O2: 21%

    -150

    38.16

    -

    -

    23.29

    -

    -

    -

    -

    -90

    31.15

    9.58

    3.75

    15.09

    5.51

    2.14

    Extinct

    4.64

    -60

    33.14

    8.73

    3.48

    12.69

    4.59

    1.9

    Extinct

    Extinct

    -30

    33.96

    7.50

    3.17

    14.79

    3.46

    2.16

    Extinct

    fail to ignite

    0

    38.91

    9.48

    1.78

    16.26

    4.61

    1.23

    Extinct

    Extinct

    30

    42.62

    10.27

    3.58

    19.29

    5.5

    3.16

    Extinct

    fail to ignite

    60

    44.74

    11.65

    4.23

    21.79

    6.28

    2.96

    9.25

    2.18

    90

    42.86

    11.43

    4.23

    24.13

    6.71

    2.59

    9.78

    3.24

    150

    49.29

    12.74

    5.1

    23.65

    6.18

    2.89

    11.86

    3.34