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Experimental characterization on pore parameter and the irradiation absorption efficiency of a series SiC foam specimens

机译：孔隙参数的实验表征及系列SiC泡沫样品的辐照吸收效率

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摘要

This paper experimentally analyzes the thermal performance of a volumetric solar receiver with a series pore structures of silicon carbide foam. Twelve silicon carbide foam specimens with various porosities and pore diameters were systematically tested on a lab-scale test platform. Three-dimensional temperature distribution, including irradiated surface temperature distribution and internal solid temperature, were obtained. Non-uniform temperature distribution on the irradiated surface and internal field, as well as the corresponding thermal efficiency under different working conditions, was analyzed. The results demonstrate that pore diameter has a more significant effect on thermal performance than porosity, as the characteristics of the specific surface area among the examined samples were mainly determined by pore diameter. For the detected solid temperatures, the highest exceeded 1000 degrees C without any damage to the porous structure, and the maximum mean outlet air temperature exceeded 544 degrees C. The thermal efficiencies of the samples with smaller pore diameter were markedly higher in most cases. The best thermal efficiency was 85.4%, which was obtained from the specimen with pore diameter of 2.27 mm and porosity of 0.663. Optimal geometric properties of SiC foam absorbers may be characterized by small pore diameter and high porosity, which can beneficial by both the advantage of uniform irradiation absorption and effective interphase convection. The experimental data presented in this paper can provide a clear reference for the theoretical model and engineering design.
机译：本文通过碳化硅泡沫串联孔结构进行了实验分析了体积太阳能接收机的热性能。在实验室测量平台上系统地测试了具有各种孔隙和孔径和孔径的十二个碳化硅泡沫样品。获得三维温度分布，包括照射表面温度分布和内固温度。分析了照射表面和内部场上的不均匀温度分布，以及不同工作条件下的相应热效率。结果表明，孔径对热性能具有比孔隙率更大的效果，因为所检查样品中的比表面积的特性主要由孔径决定。对于检测到的固体温度，最高超过1000摄氏度，没有对多孔结构造成任何损坏，最大平均出口空气温度超过544℃。在大多数情况下，孔径较小的样品的热效显着更高。最佳的热效率为85.4％，从孔径为2.27mm，孔隙率为0.663的试样获得。 SiC泡沫吸收剂的最佳几何特性可以通过小的孔径和高孔隙率来表征，这可以通过均匀照射吸收和有效界面对流的优点是有益的。本文提出的实验数据可以为理论模型和工程设计提供明确的参考。

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