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为了解导流底孔采用聚氨酯发泡材料的保温效果,结合在建的溪洛渡水电站混凝土坝工程,在距离导流底孔边墙不同深度处埋设分布式光纤,实时在线监测喷涂聚氨酯的导流底孔温度分布,分别采用日变化温度和日平均温度反演了喷涂聚氨酯的导流底孔等效表面放热系数。结果表明,喷涂2cm聚氨酯发泡材料的导流底孔等效表面放热系数为3.79kJ/(m2·h·℃);相对于日变化温度,采用日平均温度进行反演等效表面放热系数更稳定,且数值可信。
In order to understand the thermal insulation effect of polyurethane foaming material in the bottom of the diversion channel and the concrete dam project under construction in Xiluodu hydropower station, distributed optical fibers are buried at different depths from the bottom wall of the diversion bottom hole. Pore temperature distribution, respectively, using daily temperature and daily average temperature of reverse sprayed polyurethane inverted bottom hole equivalent surface heat dissipation coefficient. The results showed that the equivalent surface exothermic coefficient of the 2 cm polyurethane foamed material was 3.79 kJ / (m2 · h · ℃). The daily average temperature was used to inverse the equivalent surface heat release Coefficient is more stable, and the value of credible.