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Heat Flux Measurements in the Ohio State University Rate of Heat Release Apparatus; Technical note
| 题名： | Heat Flux Measurements in the Ohio State University Rate of Heat Release Apparatus; Technical note |
| 作者： | Filipzcak, R.; Lyon, R. E. |
| 关键词： | Heat fluxes; Heat transfer; Calorimeters; Pilot flame; Radiant energy; Calibration; Construction; Measurements; Test procedures |
| 摘要： | A copper slug calorimeter was used to measure the cold-wall heat flux and the convective heat transfer coefficient in the Ohio State University (OSU) Rate of Heat Release Apparatus specified in Federal Aviation Regulation (FAR) 25.853(a-1). The copper slug calorimeter is an American Society of Testing (ASTM) primary standard used for measuring the heat flux of radiant energy sources (ASTM E 662) and oxyacetylene torches (ASTM E 457). In contrast to the Gardon Heat Flux Sensor, the slug calorimeter provides an absolute measurement of heat flux and does not require calibration. The average convective heat transfer coefficient is obtained from the transient response of the slug calorimeter and is potentially useful as a system diagnostic since it is sensitive to air flow rate, temperature, and turbulence within the OSU chamber. Slug calorimeter construction, measurement of the heat transfer coefficient, and both global and local (e.g., at the impinging pilot flame) heat fluxes incident on the sample are discussed. The accuracy and reproducibility of sample heat fluxes are compared to those obtained with a Gardon Heat Flux Sensor. On average, the heat flux measured with an optimal copper slug calorimeter, when taking into account the absorptivity of the black surface coating, is within experimental error of the value measured with a National Institute of Standards and Technology (NIST) calibratetd Gardon Heat Flux Sensor. |
| 总页数： | 22p |
| 报告类型： | 科技报告 |
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