共查询到18条相似文献,搜索用时 250 毫秒
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对脉管型斯特林制冷机用于普冷的可行性进行了分析研究。用实验的方法对脉管到斯特林制冷机和单纯的斯特林制冷机的性能进行了对比,得出了在245K以上温区脉管型斯特林制冷机的性能优于单纯的斯特林制冷机的重要结论.对小孔和脉管长度变化对脉管型斯特林制冷机性能的影响进行了讨论. 相似文献
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通过对脉管型斯特林制冷机的分析和讨论,提出了此类制冷机的物理模型,对能量方程进行了推导,并编制了程序。计算结果显示,脉管斯特林制冷机在较高的制冷温区比单纯的斯特林制冷机有更大的制冷系数和更高的制冷量。 相似文献
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氦氢混合工质单级GM型脉管制冷特性实验研究 总被引:3,自引:0,他引:3
针对80K温区,在一台单级GM型脉管制冷机中进行了氦氢二元混合工质的实验研究。实验结果表明,采用一定组分的氦氢混合工质可以提高脉管制冷机的制冷性能。 相似文献
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斯特林制冷机的制冷系数与制冷率间的关系 总被引:2,自引:0,他引:2
从热量交换和循环运行两个力面研究了时间对斯特林制冷机的影响;推导出制冷率与制冷系数之间的关系,并且分析了各种因素对这一关系的影响。还对斯特林制冷机进行了有限时间热力学分析,以求在理论与应用的结合方面前进一步。 相似文献
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对《斯特林制冷机的制冷系数与制冷率间的关系》一文的讨论 总被引:2,自引:0,他引:2
从斯特林制冷机与卡诺制冷机的主要区别,所设的斯特林制冷机的特性,以及有限时间热力学分析的方法等三个方面讨论了《斯特林制冷机的制冷系数与制冷率间的关系》一文中所存在的主要问题。它将有助于对有限时间热力学的正确认识和进一步了解。 相似文献
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在文献〔1〕的基础上,考虑了回热过程中的不可逆因素。并由此导出了既考虑等温换热过程中的不可逆因素,又考虑等容回热过程中的不可逆因素,同时还考虑循环运动情况下的斯特林制冷机的制冷率与制冷系数间的关系。 相似文献
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《低温学》2002,42(6-7):433-437
This article mainly introduces experimental results on a new type pulse tube refrigerator named as V-M type pulse tube refrigerator. The main difference from Stirling type or G-M type pulse tube refrigerator is that thermal compressor similar to that of a V-M cryocooler is used instead of mechanical compressor. By using temperature difference between room temperature and liquid nitrogen, pressure wave with high to low pressure ratio around 1.2 is obtained. This pressure wave is used to generate cooling effect at the cold end. With a 20 K pre-cooler, this machine reaches lowest temperature 5.25 K by using helium4 at 0.77 Hz, 19 bar charge pressure. DC flow plays an important role in our system. It not only influences the final obtainable lowest temperature, but also is used to increase cold end cool-down speed. Total volume of the V-M type pulse tube refrigerator is around 3.3 l. However, dead volume inside rotor housing occupies about 2.8 l and can be much reduced. 相似文献
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A Stirling type pulse tube refrigerator with an active phase control has been experimentally investigated. A phase shifter, which controls the phase angle between the mass flow and the pressure inside a pulse tube, plays a key roll in the performance of pulse tube refrigerators. In this study, an electrically driven and mechanically damped linear compressor, which is directly connected at the warm end of the pulse tube using a connecting tube, is used as the active phase controller (APC). Therefore, this active phase control pulse tube refrigerator (APCPTR) has no reservoir. Amplified electric signals of a function generator are supplied to both the main linear compressor, which is used as the pressure wave generator (PWG), and the APC. The type of these two linear compressors is a dual-opposed piston. The advantage of this phase sifter is easy to control the electric input power and the phase angle between the PWG and the APC. In order to clarify the characteristics of the APCPTR, the cold end temperature and the gas pressure have been measured. 相似文献
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对所有的回热式低温制冷机,压力小与质量流之间的相位控制是达到制冷效果的关键。在斯特林制冷机中,这一相位是由压缩活塞和冷头排出器的相对运动来提供来;而在脉管制冷机中,这一相角是由构成脉管制冷机的各个部件:回热器、换热器、脉管、小孔,气库,连管等在几何空间上的合理拓扑结构来实现达到适宜的热声网络阻抗,从而最终实现压力波与质量流之间的适配相角。脉管制冷机的这一结构上的简化及由此带来的寿命长,可靠性高等优 相似文献
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A numerical method for regenerators is introduced in this paper. It is not only suitable for the regenerators in cryocoolers and Stirling engines, but also suitable for the stacks in acoustic engines and the pulse tubes in pulse tube refrigerators. The numerical model is one dimensional periodic unsteady flow model. The numerical method is based on the control volume concept with the implicitly solve method. The iteration acceleration method, which considers the one-dimensional periodic unsteady problem as the steady two-dimensional problem, is used for decreasing the calculation time. By this method, the regenerator in an inertance tube pulse tube refrigerator was simulated. The result is useful for understanding how the inefficiency of the regenerator changes with the inertance effect. 相似文献