吸波外热流模拟装置等效热分析模型

吸波材料可用于微波载荷无线功能测试。在微波载荷的真空热试验条件下，容器壁安装由大量四棱锥尖劈阵列而成的吸波结构，其兼具外热流模拟功能。为简化热分析以指导工程优化设计，文章基于体积平均思想，为吸波结构建立等效热分析模型，并与真实结构模型的分析结果进行对比，研究吸波装置的瞬态温度变化和外热流模拟精度以及对于复杂结构的温度场控制精度，验证了等效模型的精度与工程实用性。

Equivalent model for heat flux analysis of microwave absorber

The wave-absorbing materials are widely used in wireless tests for microwave payloads. In a thermal vacuum environment, the wave-absorbing apparatus works as an external heat flux simulator in thermal vacuum or thermal balance tests. It is composed of an array with large number of thin mini pyramids, so a huge computational resource is required in its design. A simplified thermal analysis model is required for optimizing the engineering design. Based on the volume-average approach, an equivalent thermal model is established for the wave-absorbing structure with empirical coefficients. The analytical results of the transient temperature and the thermal flux, as well as the temperature distribution, are compared between the equivalent model and the detailed (actual structure) model, and the accuracy of the equivalent model is validated. The proposed model enjoys an enhanced computational efficiency for engineering applications.