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Effect of porous media transparency on spherical and cylindrical filtrational combustion heaters performance

机译:多孔介质透明度对球形和圆柱形过滤式燃烧加热器性能的影响

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摘要

An influence of partial transparency of a porous media on radiative efficiency, maximum solid phase temperature and combustion localization radius of cylindrical and spherical filtration heater has been investigated by numerical modeling. It is shown that partial transmittance of radiation in amorphous quartz balls bed provides for 2-5/100 increase in heater radiative efficiency in comparison with opaque material of carcass. In conditions of elevated ambient temperatures (as in, e.g., thermal kilns etc.), the increase in efficiency is smaller. It is shown that the transparency of porous media may not only decrease but, unexpectedly, increase maximum solid temperatures in comparison with the opaque one, in the case of big system size and high flow rate. In the later case, superadiabatic temperature excess (50-l50 K) can be obtained in a solid phase. Also, some models of porous media optical properties are discussed.
机译:通过数值模拟研究了多孔介质的部分透明性对圆柱形和球形过滤加热器辐射效率,最大固相温度和燃烧局部半径的影响。结果表明,与不透明的of体材料相比,非晶态石英球床中辐射的部分透射率可使加热器的辐射效率提高2-5 / 100。在环境温度升高的条件下(例如在热窑等中),效率的提高较小。结果表明,在系统尺寸大,流速高的情况下,与不透明介质相比,多孔介质的透明度不仅会降低,而且出乎意料地会增加最大固体温度。在后一种情况下,可以在固相中获得超绝热温度过量(50至150 K)。此外,讨论了多孔介质光学性质的一些模型。

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