Tim MarkerFAA Technical Center

Burnthrough Task Group Report

Review of Heat Flux Mapping

Not all flame profiles identical, despite near-identical set-up, andintake air velocities (2150 ft/min).

Highest area of heat flux is not always in the area where the heatflux is currently measured.

Use of 6 by 12-inch calibration block to measure profile verytedious and time-consuming.

Continuous method of measurement was preferred, to simplifythe process, and reduce the amount of time involved.

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.

Review of Heat Flux Mapping

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

Etc., Etc., Etc….

Details of Revised Mapping Device

Board Material: ceramic fiber reinforced structural alumina composite refractory sheet

Supplied by ZIRCAR Refractory Composites, Inc.P.O. Box 489Florida, New York 10921Tel: 845-651-2200, Fax: 845-651-1515http://208.228.96.228/index.htm

Type: RS-100, Dimensions: ¾ by 24 by 48 inches

Revised 3-Hole Mapping Device

Revised 3-Hole Mapping Device

Revised 3-Hole Mapping Device

1 2 3 4 5 6 7S1

S2

S3

Lab F, 3-Hole Mapping Device, Zircal 95 Board

17.00-17.1016.90-17.0016.80-16.9016.70-16.8016.60-16.7016.50-16.6016.40-16.5016.30-16.4016.20-16.3016.10-16.2016.00-16.1015.90-16.0015.80-15.9015.70-15.8015.60-15.7015.50-15.60

1 2 3 4 5 6 7S1

S2

S3

Lab F, 3-Hole Mapping Device, RS100 Board

16.80-16.9016.70-16.8016.60-16.7016.50-16.6016.40-16.5016.30-16.4016.20-16.3016.10-16.2016.00-16.1015.90-16.0015.80-15.9015.70-15.8015.60-15.7015.50-15.6015.40-15.5015.30-15.40

1 2 3 4 5 6 7S1

S2

S3

Lab F, 3-Hole Mapping Device, Zircal 95/Kaowool

17.35-17.4617.24-17.3517.13-17.2417.02-17.1316.91-17.0216.80-16.9116.69-16.8016.58-16.6916.47-16.5816.36-16.4716.25-16.3616.14-16.2516.03-16.1415.92-16.0315.81-15.9215.70-15.81

Conclusions

Continuous mapping using stronger board material (with sufficient protection foroperator) resulted in board failure.

Limited data collected during continuous mapping produced results similar tooriginal mapping tests using 6 by 12-inch calibration block.

Recommend concluding the mapping exercise, and proceed with the next materialround robin.

Possibly continue the development of the IR mapping device, and compare theseresults to those obtained previously using the manual mapping methods.

Continuous mapping using revised, 3-hole design also resulted in board failure.

Original mapping method too tedious and time consuming, and too susceptible tominor deviations (cool down period, board size, etc.).