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首页> 外文期刊>Journal of Thermophysics and Heat Transfer >Surface-Absorption Assumption for Radiant Heating and Ignition of Energetic Solids
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Surface-Absorption Assumption for Radiant Heating and Ignition of Energetic Solids

机译:辐射加热和高能固体点火的表面吸收假设

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摘要

A simple numerical analysis is described for investigating the surface absorption assumption in radiant ignition of energetic solids. A new, nondimensional parameter is defined that quantifies the importance of in-depth (volumetric) absorption compared to surface absorption: β_s = (T_s - T_o)/(q/kK_a). For β_s 1 (high ignition temperature T_s, low absorbed radiant flux q, high thermal conductivity k, and high absorption coefficient K_a), the surface absorption assumption is valid; for β_s ≥ 1 (low ignition temperature T_s, high absorbed radiant flux q, etc.), in-depth absorption is important. Applying realistic material properties to these results shows that in many cases in-depth absorption is significant and that assuming surface absorption can cause ignition times to be severely underestimated. At sufficiently short heating times (t < 1/αK_a~2), surface absorption analysis substantially overestimates surface temperature.
机译:描述了一个简单的数值分析,用于研究高能固体辐射点火中的表面吸收假设。定义了一个新的无量纲参数,用于量化深度(体积)吸收与表面吸收相比的重要性:β_s=(T_s-T_o)/(q / kK_a)。对于β_s 1(高着火温度T_s,低吸收辐射通量q,高导热系数k,高吸收系数K_a),表面吸收假设是有效的;对于β_s≥1(低点火温度T_s,高吸收辐射通量q等),深度吸收很重要。将实际的材料特性应用于这些结果表明,在许多情况下,深度吸收是显着的,并且假设表面吸收会导致点火时间被严重低估。在足够短的加热时间(t <1 /αK_a〜2)下,表面吸收分析会大大高估表面温度。

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