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为了研究可充气聚焦器的展开过程及展开后的性能,以一个开口面积为20 m2,焦距为8 m的旋转抛物面型太阳能聚焦器为例建立了充气结构模型,采用控制体积法对一次和三次折叠的未充气状态的支撑杆及反射部件的展开过程进行了仿真计算。基于充气反射面展开后的几何模型,采用蒙特卡罗光线跟踪法,数值模拟了其对光线的聚焦性能。结果表明展开后的反射面聚焦效率约为理想设计曲面的57%,褶皱是其聚焦性能不高的主要原因。分析展开后结构的聚焦效率可以作为评价可充气展开结构展开性能优劣的一种新方法。
In order to study the unfolding process and the performance of the inflatable concentrator, an inflatable structure model was established by using a rotating parabolic solar concentrator with an opening area of 20 m2 and a focal length of 8 m. The control volume method was used for one and three times The unfolded un-inflated support rod and the reflection part were simulated. Based on the geometric model of inflatable reflector, the Monte Carlo ray tracing method was used to simulate its focusing performance on light. The results show that the focal efficiency of the developed reflector is about 57% of that of the ideal design surface. The wrinkle is the main reason of its poor focusing performance. Analyzing the focusing efficiency of the expanded structure can be used as a new method to evaluate the performance of the inflatable structure.