共查询到17条相似文献,搜索用时 125 毫秒
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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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建立了可逆脉管制冷机的等温-绝热模型,着重考虑脉管中过程对制冷机性能的影响,并与斯特林制冷机等温模型的计算机结果进行比较。结果表明,在理想工况下,可逆脉管制冷机的效率约为斯特林制冷机的85%,制冷量约为72%。可逆脉管制冷机配气活塞的最佳运动相位与斯特林制冷机基本相同。 相似文献
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po2101#fM冷机研究进层故在整个氧气巾场,这类装且的市场占有率正稳步陈国邦《低温与特气》1995儿41~10增加。目前,主要是闻和真空泵的设计结构限制了回顾了脉管制冷的发展简史,总结了最近10年吸附工艺的生产能力。脉管制冷研究取得的突出成就及水平。叙述了相移po2104#气原理对了解脉管制冷机理及强化制冷效应的作用,韩美译《低沮与特气》1995M427~指出了脉管制冷机的发展方向:有阀脉管制冷机有31可能取代常规CM制冷机,无同脉管制冷机将竞列举了主要材料气的估计需求量,以及特气的争空间用斯特林制冷机.最后讨论了可达到液氦温安全处理… 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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提出了采用合适的混合工质代替纯质氦以提高脉管制冷机在80K温区制冷量的新构思。概述了国外在制冷循环,天然气液化及J-T节流制冷中应用混合制冷剂从而提高了系统热力学效率的研究成果,及国内对混合物低温制冷物质的研究进展情况,进一步论证了混合工质应用于脉管制冷机的可行性。 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