Tim Marker FAA Technical Center Burnthrough Task Group Report

Review of Heat Flux Mapping Not all flame profiles identical, despite near-identical set-up, and intake air velocities (2150 ft/min). Highest area of heat flux is not always in the area where the heat flux is currently measured. Use of 6 by 12-inch calibration block to measure profile very tedious and time-consuming. Continuous method of measurement was preferred, to simplify the process, and reduce the amount of time involved.

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. 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 1 st 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 489 Florida, New York Tel: , Fax: Type: RS-100, Dimensions: ¾ by 24 by 48 inches

Revised 3-Hole Mapping Device

Conclusions Continuous mapping using stronger board material (with sufficient protection for operator) resulted in board failure. Limited data collected during continuous mapping produced results similar to original mapping tests using 6 by 12-inch calibration block. Recommend concluding the mapping exercise, and proceed with the next material round robin. Possibly continue the development of the IR mapping device, and compare these results 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 to minor deviations (cool down period, board size, etc.).