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This report provides a review of current heat flux mapping methods and proposes a revised procedure for more efficient and accurate measurements. The use of a continuous mapping method and a revised mapping device are suggested. The report concludes with recommendations for further development and evaluation of an infrared (IR) mapping device.
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Burnthrough Task Group Report Tim Marker FAA Technical Center
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 notalways 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.
Review of Heat Flux Mapping 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.
Revised Burner Mapping Procedure 2 minute warm-up + 1 minute soak, 10 second data collection Position 1
Revised Burner Mapping Procedure Move entire board 1 inch, 10 second data collection 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 Drop entire board down 1 inch, repeat process Position 8
Revised Burner Mapping Procedure Position 9
Revised Burner Mapping Procedure Position 10
Revised Burner Mapping Procedure Position 11
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 10921 Tel: 845-651-2200, Fax: 845-651-1515 http://208.228.96.228/index.htm Type: RS-100, Dimensions: ¾ by 24 by 48 inches
Conclusions Original mapping method too tedious and time consuming, and too susceptible to minor deviations (cool down period, board size, etc.). Continuous mapping using stronger board material (with sufficient protection for operator) resulted in board failure. Continuous mapping using revised, 3-hole design also 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.
