高温下纳米隔热材料内热辐射的影响将显著增强,其热辐射特性对热辐射传热有很大影响.为了认识高温纳米隔热材料的热辐射特性,采用Mie理论建立了掺杂纤维增韧剂和遮光剂的纳米隔热材料热辐射特性理论计算方法,编写了纳米隔热材料热辐射特性计算程序,对某纳米隔热材料的热辐射特性进行了理论研究,得到了光谱衰减系数、光谱散射反照率以及全光谱平均辐射特性参数及散射相函数.理论模拟结果表明:在3 ～9.5 μm波长范围内,纳米隔热材料对热辐射具有强烈的衰减作用,对3～7 μm的热辐射呈现强烈的散射特征,对7～9.5 μm的热辐射,随波长增大散射特征逐渐减弱,对9.5 μm的热辐射呈现较强的吸收特征.在300～1 300 K,该纳米隔热材料全光谱平均衰减系数＞5×104 m-1,平均散射反照率＞0.96,具有较强的前向散射特征,这些特征来源于遮光剂粒子,增韧剂影响很小.
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