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摘要:
聚焦型太阳模拟器可以获得高倍汇聚的太阳辐射光斑，在太阳能热发电及热化学研究领域具有重要应用。为了获得均匀的太阳辐射光斑，提出了基于非成像光学的自由曲面聚光镜设计方法。详细阐述了设计原理与具体方法。设计了自由曲面聚光镜，并将其与包容角相同的非共轴椭球聚光镜进行对比。通过仿真分析验证了设计方法的正确性。仿真结果表明：使用额定功率为6 kW的氙灯作为光源时，自由曲面聚光镜构成的单灯太阳模拟器可以在直径为60 mm的目标面内提供平均辐照度为274.4 kW/m2的光斑，与非共轴椭球太阳模拟器相比，光斑不均匀度从18.28%下降到5.69%；七灯太阳模拟器可以产生平均辐照度为1.65 MW/m2的光斑，光斑不均匀度从13.19%下降到5.79%。
Abstract:The concentrating solar simulator can obtain solar radiation spots with high-power convergence, which has important applications in the fields of solar thermal power generation and thermochemical research. To obtain uniform solar radiation spots, a free-form surface condenser design method based on non-imaging optics is proposed, and its design principle and specific method are described. The designed free-form condenser is compared with a non-coaxial ellipsoidal condenser with the same containment angle, and the correctness of its design method is verified by simulation analysis. The simulation results show that when a xenon lamp with a rated power of 6 kW is used as the light source, the single-lamp solar simulator composed of a free-form condenser can produce a spot with an average irradiance of 274.4 kW/m2 in the target region with a diameter of 60 mm. The spot’s unevenness decreases from 18.28% to 5.69% compared with that of a non-coaxial ellipsoidal solar simulator. The seven-lamp solar simulator can produce a spot with an average irradiance of 1.65 MW/m2, with a spot unevenness that decreases from 13.19% to 5.49%.
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Key words:
- solar simulator /
- free-form surface /
- optical design /
- spot uniformity /
- heat flux distribution
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图 6 自由曲面聚光镜母线相邻迭代点计算
Figure 6. Calculation of adjacent iteration points of the freeform condenser busbars
图 7 采用点光源的自由曲面聚光镜仿真结果
Figure 7. Simulation results of free-form condenser with point source
图 8 采用扩展光源自由曲面聚光镜仿真结果
Figure 8. Simulation results of free-form condenser with extended light source
图 9 直径为120 mm目标区域的辐照度分布
Figure 9. Irradiance distribution in target area with diameter of 120 mm
图 10 直径为60 mm目标区域的辐照度分布
Figure 10. Irradiance distribution in target area with diameter of 60 mm
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