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采用遗传算法研究了氧化锆纤维隔热材料的高温传热机理,以Zircar公司的氧化锆纤维板为例,计算了400~1650℃氧化锆纤维板的导热系数,并计算了隔热材料内部辐射热流密度。同时计算了材料内部辐射反照系数,得到了不同温度下传导、对流、辐射在总传热中所占的比例。结果表明,导热系数的理论计算值与实验值符合较好,此外,随着温度的升高,材料内部传热中对流和辐射传热所占比重越来越大,特别是辐射传热增加的很快,在1650℃时,辐射传热占总传热量的41%。
The heat transfer mechanism of zirconia fiber insulation was studied by using genetic algorithm. Taking zirconia fiberboard of Zircar company as an example, the thermal conductivity of zirconia fiberboard at 400-1650 ℃ was calculated and the radiative heat flux density . At the same time, the internal radiation albedo coefficient of the material was calculated, and the proportion of conduction, convection and radiation in the total heat transfer under different temperatures was obtained. The results show that the calculated value of thermal conductivity is in good agreement with the experimental value. In addition, with the increase of temperature, the proportion of convection and radiative heat transfer in the internal heat transfer increases, especially the radiation heat transfer increases Soon, at 1650 ℃, radiation heat transfer accounted for 41% of the total heat transfer.