Tim Marker

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Discussion of Burner Heat Flux Mapping
for Proposed Insulation Burnthrough Test Standard
Tim Marker
FAA Technical Center
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Heat Flux Mapping of Burner Flame
Purpose To produce a burner flame profile to
determine if the high heat flux area(s) are in
the same location as the current location
used during calibration.
The flame profile is a useful tool in making
lab-to-lab comparisons.
Methodology Use existing heat flux transducer
(calorimeter) to measure the heat flux at a
variety of pre-set locations.
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Pre-Set heat flux measuring locations
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Conclusions of Mapping (2nd time)
Standardization of intake system likely reduced
lab-to-lab differences
Elimination of highly irregular flame profiles
Full analysis of progress very difficult
Small data set (only 5 of 9 labs reporting)
Standardized mapping procedure not fully adhered
to (2 of 5 mapped differently)
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Future Considerations
Standardization of calorimeter mounting block
size/type
Use the 6- by 12-inch marinite block specified in
proposed Rule,
Use another agreed-to size/type of mounting block
Standardization of initial temperature of
calorimeter block
Thermocouple imbedded into mounting block surface
provides accurate initial temperature
Heat soak the calorimeter prior to start of
mapping
Revised data collection procedure
Continuous collection of all 21 data points
without shutting burner off
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Heat Flux Transducer Sample Holder Used for
Continuous Data Collection
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Heat Flux Transducer Sample Holder Used for
Continuous Data Collection
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Heat Flux Transducer Sample Holder Used for
Continuous Data Collection
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Heat Flux Transducer Sample Holder Used for
Continuous Data Collection
Insufficient board material between holes
Crack!
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Revised Pre-Set Heat Flux Measuring Locations
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Initial Result Using Marinite Board
Marinite-inorganic calcium silicate board
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Second Result Using Zircal-95 Board
Zircal 95-high density calcium silicate hydrate
mix
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Second Result Using Zircal-95 Board
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Conclusions
Continuous mapping of burner flame using
pre-drilled sample board/heat flux transducer
very difficult.
Future of HF mapping
Original mapping method, with sufficient cooling
time between locations.
Imbedded thermocouple placed in mapping block to
ensure appropriate start time.
Continuous mapping using thicker/stronger board
material, with sufficient protection for operator.
Alternative approach using IR camera.
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Burnthrough Task Group Report
Tim Marker
FAA Technical Center
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Revised Burner Mapping Procedure
2 minute warm-up 1 minute soak, 10 second data
collection
Position 1
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Revised Burner Mapping Procedure
Move entire board 1 inch, 10 second data
collection
Position 2
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Revised Burner Mapping Procedure
Move entire board 1 inch, 10 second data
collection
Position 3
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Revised Burner Mapping Procedure
Move entire board 1 inch, 10 second data
collection
Position 4
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Revised Burner Mapping Procedure
Move entire board 1 inch, 10 second data
collection
Position 5
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Revised Burner Mapping Procedure
Move entire board 1 inch, 10 second data
collection
Position 6
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Revised Burner Mapping Procedure
Move entire board 1 inch, 10 second data
collection
Position 7
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Revised Burner Mapping Procedure
Move entire board back to 1st position, 10 second
data collection
Position 1
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Revised Burner Mapping Procedure
Drop entire board down 1 inch, repeat process
Position 8
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Revised Burner Mapping Procedure
Position 9
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Revised Burner Mapping Procedure
Position 10
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Revised Burner Mapping Procedure
Position 11
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Summary of New Mapping Process
FAATC will draft up detailed drawings of new
mapping board, including details such as material
type, thickness, density, etc.
Individual labs will be responsible for
constructing their own mapping board.
International Aero will continue its development
of the IR mapping device, and a comparison of the
2 methods can be made prior to the next meeting.
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