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HEAT FLUX CALIBRATION TASK GROUP 2011 March Materials Meeting Savannah, GA

Explore the evolution of aviation heat flux calibration standards, methods, and study results presented at the 2011 March Materials Meeting in Savannah, GA. Delve into the history, proposed new methods, NIST calibration data, and next steps. Join the task group for a comprehensive review.

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HEAT FLUX CALIBRATION TASK GROUP 2011 March Materials Meeting Savannah, GA

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  1. HEAT FLUX CALIBRATION TASK GROUP2011 March Materials MeetingSavannah, GA Michael Burns, FAA Tech Center March, 2011

  2. AGENDA • History • “Interim” Aviation Heat Flux Calibration Standard • Proposed New Calibration Method (Draft) • Radiant Panel Calibration Study • NSIT Calibrated Schmidt-Boelter HFG Data • Next Steps

  3. BRIEF HISTORY 06/08 – Discovery of Heat Flux Gage Calibration Discrepancy Visit to Manufacturers / NIST 06/09 – International Heat Flux Gage Calibration Study Industry Submitted Gages To FAA Technical Center For Calibration Comparison 07/09 – Heat Flux Sensitivity Study Using Gages Installed In Test Apparatus (HRR, NBS Smoke Density & Radiant Panel tester) 10/09 – Sensitivity Study Effect On Data By Varying Heat Flux Levels 10/10 – Development Of Interim Aviation Heat Flux Gage Calibration Standard

  4. Interim Aviation Heat Flux Calibration

  5. Interim Aviation Heat Flux Calibration Calorimeter Specifications • Construction / Type - Gardon • Principle of Operation – Gardon Foil • Painted Surface Area – Partial vs. Full Face Definitions NIST Calibration • Single Point vs. Full Range (Based on 10 point Cal.) • FAA Flammability Heat Flux Requirements - Ranges Calibration Interim

  6. Interim Aviation Heat Flux Calibration Calibration Method • Like gage with like gage – Manufacturer / Paint • Place Standardized HFG and Working HFG an equal distance from heat source (traditionally, opposite sides of a graphite plate) • Ramp up heat and record data on cool down • Calculate HFG Sensitivity Calibration Procedure Requirements – Repeatability / Reproducibility Supplemental Section – General notes / Reporting

  7. Draft - Aviation Heat Flux Calibration Standard Calorimeter Specifications • Construction / Type – Possibly including Schmidt-Boelter type gages • Principle of Operation – Possibly include Thermopile • Painted Surface Area – Changed so that only gages with entire front face painted will be used Definitions – Minor Changes / Additions NIST Calibration • FAA Flammability Heat Flux Requirements – Possibly change from nearest Range to exact heat flux point Calibration Interim - Unchanged

  8. Draft - Aviation Heat Flux Calibration Standard Calibration Method • Like gage with like gage - Removed • Place Standardized HFG and Working HFG an equal distance from heat source (traditionally, opposite sides of a graphite plate) – Must be in exact same position • Ramp up heat and record data on cool down – Steady State • Calculate HFG Sensitivity – Possibly Add % STDEV Calibration Procedure – Steady State, interchange positions Requirements – Possibly Changed to Allowable % STDEV Supplemental Section - Minor Changes / Additions

  9. Radiant Panel Validation Study Gardon vs. Schmidt-Boelter • 2 Vatell (Full Paint), 1 Medtherm (Partial) & 1 Hukseflux (Partial) HFG Were Sent To NIST For Calibration • Radiant Panel Tester Set To 1.4 BTU/ft2*sec Using one of the Vatell Gages • Interchanged Vatell Gage with other 3 gages

  10. NEXT • Continue to look at Schmidt-Boelter type gages • Install Gages Into OSU & NBS • Continue forward on “Interim” Aviation Heat Flux Calibration Method (Transition Target Date 06/01/11) • Continue Work On “Draft” Aviation Heat Flux Calibration Method via Task Group Participation

  11. Questions / Comments? “The road to success is always under construction” Unknown Author

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