tim marker discussion of burner heat flux mapping for proposed insulation burnthrough test standard...
TRANSCRIPT
Tim Marker
Discussion of Burner Heat Flux Mapping forProposed Insulation Burnthrough Test Standard
FAA Technical Center
Heat Flux Mapping of Burner Flame
Purpose: To produce a burner flame profile to determine if the highheat flux area(s) are in the same location as the current location usedduring calibration.
Methodology: Use existing heat flux transducer (calorimeter) tomeasure the heat flux at a variety of pre-set locations. ____________________
The flame profile is a useful tool in making lab-to-lab comparisons.
Pre-Set heat flux measuring locations
1 2 3 4 5 6 7S1
S2
S3
Lab F New Mapping Procedure, No Intake Duct, 2150 Ft/min
17.28-17.36
17.19-17.28
17.11-17.19
17.02-17.11
16.94-17.02
16.85-16.94
16.77-16.85
16.68-16.77
16.60-16.68
16.51-16.60
16.43-16.51
16.34-16.43
16.26-16.34
16.17-16.26
16.09-16.17
16.00-16.09
1 2 3 4 5 6 7S1
S2
S3
Lab F, New Mapping Procedure w/Intake Duct, 2150 Ft/min
16.83-16.92
16.75-16.83
16.66-16.75
16.58-16.66
16.49-16.58
16.41-16.49
16.32-16.41
16.24-16.32
16.15-16.24
16.07-16.15
15.98-16.07
15.90-15.98
15.81-15.90
15.73-15.81
15.64-15.73
15.56-15.64
1 2 3 4 5 6 7S1
S2
S3
Lab B, New Mapping Procedure w/Intake Duct, 2150 Ft/min
16.50-16.62
16.38-16.50
16.26-16.38
16.14-16.26
16.02-16.14
15.90-16.02
15.78-15.90
15.66-15.78
15.54-15.66
15.42-15.54
15.30-15.42
15.18-15.30
15.06-15.18
14.94-15.06
14.82-14.94
14.70-14.82
1 2 3 4 5 6 7S1
S2
S3
Lab C, New Mapping Procedure w/Intake Duct, 2150 Ft/min
14.30-14.40
14.20-14.30
14.10-14.20
14.00-14.10
13.90-14.00
13.80-13.90
13.70-13.80
13.60-13.70
13.50-13.60
13.40-13.50
13.30-13.40
13.20-13.30
13.10-13.20
13.00-13.10
12.90-13.00
12.80-12.90
1 2 3 4 5 6 7S1
S2
S3
Lab G, New Mapping Procedure w/Intake Duct, 2150 Ft/min
15.75-15.86
15.64-15.75
15.53-15.64
15.42-15.53
15.31-15.42
15.20-15.31
15.09-15.20
14.98-15.09
14.87-14.98
14.76-14.87
14.65-14.76
14.54-14.65
14.43-14.54
14.32-14.43
14.21-14.32
14.10-14.21
Conclusions of Mapping (2nd time)
Standardization of intake system likely reduced lab-to-lab differences
Full analysis of progress very difficult:
Standardized mapping procedure not fully adhered to (2 of 5 mapped differently)
Small data set (only 5 of 9 labs reporting)
Elimination of “highly irregular” flame profiles
Future Considerations
Standardization of calorimeter mounting block size/type
Standardization of initial temperature of calorimeter block
Use the 6- by 12-inch marinite block specified in proposed Rule,
Use another agreed-to size/type of mounting block
Thermocouple imbedded into mounting block surface provides accurateinitial 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
Heat Flux Transducer Sample HolderUsed for Continuous Data Collection
Heat Flux Transducer Sample HolderUsed for Continuous Data Collection
Heat Flux Transducer Sample HolderUsed for Continuous Data Collection
Heat Flux Transducer Sample HolderUsed for Continuous Data Collection
Insufficient board material between holes
Crack!
Revised Pre-Set Heat Flux Measuring Locations
Initial Result Using Marinite Board
Marinite-inorganic calcium silicate board
Second Result Using Zircal-95 Board
Zircal 95-high density calcium silicate hydrate mix
Second Result Using Zircal-95 Board
Conclusions
Continuous mapping of burner flame using pre-drilledsample 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 sufficientprotection for operator.
Alternative approach using IR camera.
Tim Marker
FAA Technical Center
Burnthrough Task Group Report
Revised Burner Mapping Procedure
2 minute warm-up + 1 minute soak, 10 second data collection
Position 1
Move entire board 1 inch, 10 second data collection
Revised Burner Mapping Procedure
Position 2
Revised Burner Mapping Procedure
Move entire board 1 inch, 10 second data collection
Position 3
Revised Burner Mapping Procedure
Move entire board 1 inch, 10 second data collection
Position 4
Revised Burner Mapping Procedure
Move entire board 1 inch, 10 second data collection
Position 5
Revised Burner Mapping Procedure
Move entire board 1 inch, 10 second data collection
Position 6
Revised Burner Mapping Procedure
Move entire board 1 inch, 10 second data collection
Position 7
Revised Burner Mapping Procedure
Move entire board back to 1st position, 10 second data collection
Position 1
Revised Burner Mapping Procedure
Position 8
Drop entire board down 1 inch, repeat process
Position 9
Revised Burner Mapping Procedure
Position 10
Revised Burner Mapping Procedure
Position 11
Revised Burner Mapping Procedure
Summary of New Mapping Process
FAATC will draft up detailed drawings of new mapping board, including details suchas 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 acomparison of the 2 methods can be made prior to the next meeting.
