Estimates of the Uncertainty of Radiative Heat Flux Caclulated From Total Heat Flux Measurements | NIST
Estimates of the Uncertainty of Radiative Heat Flux Caclulated From Total Heat Flux Measurements | NIST
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根据总热通量测量计算的辐射热通量的不确定性估计|
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
C. Womeldorf
中科院分区：
文献类型：
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作者：
R. Bryant;E. Johnsson;T. Ohlemiller;C. Womeldorf
作为表征与火灾环境中的热通量测量相关的不确定性的努力的一部分，使用来自遵循ISO 9705指南的房间拐角表面产品测试的测量数据进行不确定性分析示例。选择用于模拟Schmidt-Boelter（热电堆）型总热通量计表面处的热传递的方程，以用于从总热通量测量计算入射辐射通量。热通量测量的不确定性来源的影响进行了评估，通过采用不确定性传播的入射辐射的所得方程。对于模型方程和选定的示例条件，自由流温度测量和热通量计校准常数被建议为主要的不确定度贡献者。该研究演示了如何系统地识别主要的不确定性来源，以减少总的不确定性，从而提高实验设计。
As part of an effort to characterize the uncertainties associated with heat flux measurements in a fire environment, an uncertainty analysis example was performed using measurement data from a room corner surface products test that followed the guidelines of ISO 9705. Equations to model the heat transfer at the surface of a Schmidt-Boelter (thermopile) type total heat flux gauge were selected for use to calculate the incident radiative flux from a total heat flux measurement. The effects of the heat flux measurement uncertainty sources were evaluated by employing an uncertainty propagation on the resulting equation for incident radiation. For the model equations and the example conditions selected, the free-stream temperature measurement and the heat flux gauge calibration constant were suggested as major uncertainty contributors. The study demonstrates how to systematically identify major sources of uncertainty for the purpose of reducing total uncertainty and therefore enhancing experiment design.