tim marker discussion of burner heat flux mapping for proposed insulation burnthrough test standard...

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.