光伏发电以绿色、可再生、能源质量高和不受资源分布地域的限制等优点被广泛使用, 单晶硅又以低衰减率和高转换效率等优点渐渐超过了多晶硅光伏电池在市场中的份额,但成本问题和产能问题一直束缚着单晶硅太阳能产业的发展。本文提出了一种在晶体生长过程中随硅液面下降而下降的直拉单晶炉热屏结构, 来解决在拉晶过程中坩埚上升所造成的拉晶速度和稳定性降低以及拉晶能耗增加的问题, 并以CL120-97单晶炉热场为研究对象, 利用有限元仿真对单晶炉优化前后晶体和熔体的热场以及氩气流场进行分析。分析仿真结果表明,优化后单晶炉不仅可以提高单晶炉拉晶的速度和质量, 而且还能有效降低单晶炉拉晶的能耗。

片状放大器腔内钕玻璃表面的洁净度是保证放大器高工作性能和长寿命的关键指标，而合理的腔内流场分布是放大器保持腔内洁净的前提条件。运用计算流体力学方法，利用Fluent软件对纯氮气冲洗片状放大器过程中的腔内流场进行模拟，并在样机上验证了模型的有效性；通过调整放大器的进出气口结构及位置排布，获得了最佳的流场分布。实验结果表明，相比未优化放大器，优化后的放大器仅使用一半时间就可以达到相同的腔内洁净度等级，且钕玻璃表面洁净度更高。

The cleanliness of neodymium glass surface in the slab amplifier is a key indicator of guaranteeing high performance and long lifetime of amplifiers, and the reasonable internal flow field distribution is the prerequisite for keeping clean in the amplifier cavity. By means of computational fluid dynamics method and with the Fluent software, the internal flow field of slab amplifier cavity in the purging process of pure nitrogen is simulated, and the model validity is verified on the prototype system. By adjusting the structure and location arrangement of air inlets and outlets of the amplifier, the optimal flow field distribution is obtained. The experimental results show that compared with those of the non-optimized amplifier, the optimized amplifier not only takes only half time to obtain the same required cleanliness, but also the cleanliness of neodymium glass surface is higher.