Tim Marker Discussion of Burner Heat Flux Mapping for Proposed Insulation Burnthrough Test Standard FAA Technical Center

Heat Flux Mapping of Burner Flame Purpose: To produce a burner flame profile to determine if the high heat flux area(s) are in the same location as the current location used during calibration. Methodology: Use existing heat flux transducer (calorimeter) to measure 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

Conclusions of Mapping (2 nd 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 accurate initial 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 Holder Used for Continuous Data Collection

Heat Flux Transducer Sample Holder Used for Continuous Data Collection

Heat Flux Transducer Sample Holder Used for Continuous Data Collection

Heat Flux Transducer Sample Holder Used 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-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.

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 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

Summary of New Mapping Process FAATC will draft up detailed drawings of new mapping board, including details such as 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 a comparison of the 2 methods can be made prior to the next meeting.