基于分析J-T节流制冷器局部优化设计

The Local Optimal Design of J-T Cryocoolers Based on Exergy Analysis

本文针对Hampson型J-T节流制冷器提出了肋片非等距双螺旋回热器结构,并建立相应的数理模型,从局部参数优化角度对回热器性能进行研究。在分析新型回热器损失空间分布特点的基础上,通过采用合理的非等螺距的肋片布置形式,来减少回热器的总损失和提高回热性能。本文构建了新型双螺旋回热器的BBD实验表,并数值求解和分析了各种非等间距回热器的损失与换热量分布特性。结果表明:采用合适的非等间距双螺旋回热器可以在减少材料消耗的基础上,调整高低温区域的换热负荷占比和改进损失空间分布,进一步减小总损失和提高换热量。最后验证了新型双螺旋换热器结构的合理性与有效性,为J-T节流制冷器双螺旋型换热器的优化设计和性能提升提供了新的思路。

In this paper, the non-isometric fin structure of helical coiled refrigerator for Hampson type J-T throttle cooler is proposed, and the corresponding mathematical model is established. The performance of recuperator is studied from the point of local optimization. Based on the analysis of the spatial distribution characteristics of exergy destruction, reasonable non-isometric fin layout form is adopted to reduce the total exergy destruction and improve the refrigerator performance. The BBD experiment table of the new helical coiled recuperator is established, and the exergy destruction and heat flux distribution of different non-isometric recuperator are solved numerically and analyzed. The results indicates that： the suitable fin spacing of the new recuperator can reduce material consumption, and then adjust the proportion of heat load for high and low temperature regions and improve exergy destruction distribution, which further reduce the total exergy destruction and increase the heat flux. Eventually, the rationality and validity of the new non-isometric recuperator are verified, which provides a new way for the optimization design and performance improvement of helical coiled heat exchanger of J-T cryocoolers.