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Description
Miniature Stirling cryocoolers based on SWaP-C (Size, Weight, Power Consumption, and Cost) objectives for HOT IR technology are prioritize size, weight, and power at a low cost and have grown their importance in the industries of defense, aerospace, medical devices and small scale cryogenic systems. The significance of a miniature Stirling cryocooler for HOT IR technology based on SWaP-C objectives lies in its potential to address the specific requirements and challenges of HOT IR systems compactly and efficiently. The regenerator is one of the most essential component of the miniature Stirling cryocoolers, and effective geometrical and thermal design of the regenerator plays a major role in the overall cooling performance of a small scale miniature Stirling cryocooler based on SWaP-C configuration, therefore, enhancements in the geometrical design and thermal performance of the regenerator have been imperative aspects in upgrading the cryocooler's efficiency. When optimizing the regenerator design for a miniature rotary Stirling cryocooler in a SWaP-C configuration, several factors should be considered. The regenerator must be designed with a compact geometry that minimizes dead volumes and reduces clearance spaces. A tight fit between the displacer and the cylinder walls helps minimize gas bypass and improves efficiency. The appropriate length and porosity of the regenerator must be determined to maximize heat transfer while minimizing pressure drop and dead volumes. The regenerator materials with high thermal conductivity must be selected to enhance heat transfer within the regenerator matrix. Besides the material selection, the proper implementation of strategy is necessary to reduce thermal dispersion within the regenerator material, such as using thin foils or woven wire meshes. This helps maintain a temperature gradient across the regenerator, enhancing the heat transfer process. In the current research, numerical and parametric evaluations of a cryogenic regenerator are carried out by using ANSYS Fluent and REGEN3.3 to optimize the geometrical and thermal design of regenerator for a miniature Stirling Cryocooler based on SWaP-C configuration. The effects of geometrical design and flow variables are explored, on the temperature swing, pressure drop, regenerator losses, thermal in-effectiveness and COP of the regenerator for a variety of regenerator length and diameter and for a wide range of velocities/massflow rates, porosities, frequencies, and cold end phase angles and temperatures. The analyses revealed that the calculated outcomes for both ANSYS Fluent and REGEN3.3 strategies are generally in accord with one another and most interestingly by optimizing the geometrical and thermal design of the regenerator, a miniature rotary Stirling cryocooler can achieve enhanced SWaP-C characteristics and improved efficiency.
| Submitters Country | China |
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