Almtireen Natheer, Brandner Jürgen J, Korvink Jan G
Institute of Microstructure Technology (IMT), Karlsruhe Institute of Technology (KIT); 76344 Eggenstein-Leopoldshafen, Germany.
Micromachines (Basel). 2020 Mar 30;11(4):361. doi: 10.3390/mi11040361.
Regenerative cryocoolers such as Stirling, Gifford-McMahon, and pulse tube cryocoolers possess great merits such as small size, low cost, high reliability, and good cooling capacity. These merits led them to meet many IR and superconducting based application requirements. The regenerator is a vital element in these closed-cycle cryocoolers, but the overall performance depends strongly on the effectiveness of the regenerator. This paper presents a one-dimensional numerical analysis for the idealized thermal equations of the matrix and the working gas inside the regenerator. The algorithm predicts the temperature profiles for the gas during the heating and cooling periods, along with the matrix nodal temperatures. It examines the effect of the regenerator's length and diameter, the matrix's geometric parameters, the number of heat transfer units, and the volumetric flow rate, on the performance of an ideal regenerator. This paper proposes a 2D axisymmetric CFD model to evaluate the ideal regenerator model and to validate its findings.
诸如斯特林制冷机、吉福德-麦克马洪制冷机和脉管制冷机等回热式低温制冷机具有体积小、成本低、可靠性高和制冷能力强等优点。这些优点使它们能够满足许多基于红外和超导的应用需求。回热器是这些闭式循环低温制冷机的关键部件，但其整体性能在很大程度上取决于回热器的效率。本文针对回热器内部基质和工作气体的理想化热方程进行了一维数值分析。该算法可预测气体在加热和冷却期间的温度分布以及基质节点温度。它研究了回热器的长度和直径、基质的几何参数、传热单元数和体积流量对理想回热器性能的影响。本文提出了一个二维轴对称计算流体动力学模型，以评估理想回热器模型并验证其研究结果。
