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常温下对一台蓄冷器外置式的液氮温区G-M制冷机组二级各主要部分的压力损失进行了测试,发展蓄冷器外置式的G-M制冷机二级各主要部分的压力损失自大小依次为蓄冷器料阻力占41.2%,蓄冷器附件阻力占31.5%,二级冷头换热器阻力(仪外狭缝部分)占27.3%,通过与常规G-M机蓄冷器阻力的对比,表明蓄冷外置式的G-M制冷机蓄冷器的压力损失有明显减小。 相似文献
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在建立了一套使用电磁阀控制G-M型制冷机进,排气的软,硬件控制系统的基础上,成功地控制了双级G-M型制冷机的进,排气动作。在实验的基础上指出,对于G-M型制冷机而言,存在一定的最佳进,排气角度,这个最佳的进,排气角度对于不同的制冷机而言是不同的。并且制冷机性能受频率变化的影响也是非常大的。文章对此进行了初步的分析,为制冷机的理论分析和设计计算提供了有力的实验依据。 相似文献
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蓄冷器是脉冲管制冷机等回热式制冷机的关键部件,它性能的好坏直接影响到回热式制冷机的效率和性能。交变流动蓄冷器中的热量和动量传输及转换过程是一个十分复杂的传热学,流体力学及热力学问题。低温中心针对交变流动蓄冷器的特点建立了动态参数测试实验台。实验台可以模拟各种脉冲管制冷机的真实运行条件。针对50Hz的交变流动蓄冷器的阻力特性进行了系统的实验研究,第一部分介绍实验装置及数据处理系统。 相似文献
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介绍了一台以磁性蓄冷材料Er3Ni为第二级蓄冷器填料的大制冷功率两级G-M制冷机。该制冷机可作为空间环境模拟设备冷背景冷源,满足了辐射制冷器空间环境热模拟试验的要求。通过优化制冷机结构参数,使制冷机在转速为40r/min时,二级最低制冷温度达5.5K、20K时取得15.4W的有效制冷量。证明了应用磁性蓄冷材料改善G-M制冷机性能的有效性。 相似文献
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详细描述了针对低温真空泵用的紧凑型两级G—M制冷机的实验系统和测试方法,试验测试了不同的蓄冷材料,尤其是磁性蓄冷材料来提高制冷机性能,在一种结构十分紧凑的两级G—M制冷机上在12K获得了4W的制冷量,最低制冷温度为7.3K。还对该制冷机在没有吸附装置的情况做了对比实验研究,有利于扩展G—M制冷机的用途。 相似文献
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对具有固定二级蓄冷器的G-M制冷机的制冷性能和改性能力进行了多次试验,给出了试验结果,并对结果进行了分析和讨论。 相似文献
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新型磁性蓄冷材料G—M制冷机的研制 总被引:1,自引:0,他引:1
对应用磁性蓄冷材料作为二级蓄冷器填料而研制的大制冷功率两级G- W 制冷机的研究工作进行了总结,给出了理论分析及结构设计。并在一台样机进行了实验研究,通过优化制冷机结构参数和运行参数,使制冷机二级最低制冷温度达7.8 K、20 K 时取得14.5 W 的有效制冷量,从理论和试验上对应用磁性蓄冷材料改善G- M 制冷机性能的有效性进行了有益的探索。 相似文献
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具有独立气路的液氦温区G-M型二级脉管制冷机性能研究 总被引:1,自引:1,他引:1
研究了一台具有独立气体回路的液氦温区G-M型二级脉管制冷机的制冷性能.目前的实验装置由两套独立的单级双向进气型脉管系统构成,第一级冷头对第二级进气的预冷通过安装在第二级回热器中部的换热器与一级冷头之间的热联接来实现.研究表明,该制冷机采用4He为工质,分别以Leybold CP4000和RW2氦压缩机来驱动第一级和第二级,可以获得2.18 K的最低无负荷制冷温度,4.2 K提供的最大制冷量为595 mW. 相似文献
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采用混合工质的回热器性能研究 总被引:1,自引:1,他引:0
基于Daney提出的回热器性能计算机联式,对以氦和氮为主的混合物(包括He-Ne,He,Ar,He-H2,N2-Ne,N2-H2,N2-Ar,N2-He)的传热与流动性能进行了计算,得出了一些与Daney不同的结论,对研究回热式制冷机在80K温区的制冷效能具有一定的指导作用。 相似文献
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VM气耦合脉冲管制冷机(VM-PT)是一种新型的液氦温区制冷机,为探索两级气耦合复杂的机理,本文采用Sage软件构建了低温调相VM-PT制冷机的整机模拟程序,研究了运行频率、平均压力、毛细管长度以及Er3Ni填充长度等参数对两级气量分配的影响。数值结果表明运行频率、平均圧力、毛细管长度以及Er3Ni填充长度均会影响两级质量流的分配,进而影响制冷机的最低温度,权衡工质的做工能力以及蓄冷器损失两方面因素,该四个参数均存在一个最佳值。搭建了实验平台并对数值模拟进行了验证。在实验中通过优化毛细管和蓄冷器,在运行频率1.6 Hz、平均压力1.4 MPa、压比1.6的情况下得到了3.86 K的无负荷制冷温度,在4.2 K可提供约10 mW的制冷量。 相似文献
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The low temperature regenerator with rectification meshes was designed to improve the cooling performance of a 10 K G-M refrigerator. The rectification meshes were packed not only at the two ends, but also in two additional positions inside the regenerator. By improving the helium gas distribution inside the regenerator at low temperatures, the cooling performance of the G-M refrigerator was obviously improved. The improvement was influenced by the positions and quantity of the rectification meshes inside the regenerator. The other factors influencing the performance of G-M refrigerator, including the charge pressure and input power, were also tested and their optimum values are given in this paper. 相似文献
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《低温学》2014
The method of wave-shaping acoustic resonators is applied to an inertance type cryogenic pulse tube refrigerator (IPTR) to improve its performance. A detailed time-dependent axisymmetric experimentally validated computational fluid dynamic (CFD) model of the PTR is used to predict its performance. The continuity, momentum and energy equations are solved for both the refrigerant gas (helium) and the porous media regions (the regenerator and the three heat-exchangers) in the PTR. An improved representation of heat transfer in the porous media is achieved by employing a thermal non-equilibrium model to couple the gas and solid (porous media) energy equations. The wave-shaped regenerator and pulse tube studied have cone geometries and the effects of different cone angles and the orientation (nozzle v/s diffuser mode) on the system performance are investigated. The resultant spatio-temporal pressure, temperature and velocity fields in the regenerator and pulse tube components are evaluated. The performance of these wave-shaped PTRs is compared to the performance of a non wave-shaped system with cylindrical components. Better cooling is predicted for the cryocooler using wave-shaped components oriented in the diffuser mode. 相似文献
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Youngkwon Kim 《International Journal of Refrigeration》2011,34(1):204-215
In this study, a one-dimensional model for the active magnetic regenerator (AMR) is established and verified by comparison with the experimental results. Besides four basic governing equations concerning mass and momentum conservation of heat transfer fluid and energy conservation of fluid and magnetic refrigerant, energy conservation of the regenerator wall is considered to achieve high accuracy and generalization. For the verification, a room temperature AMR has been fabricated with Gd and Halbach array. The AMR is operated by helium compressor with a rotary valve so that the effect of gas-compression/expansion also exists. Instantaneous mass flow rate and temperature distributions are measured during the experiment. Measured values are utilized as the boundary conditions and compared with the simulation results. Instead of cooling capacity or COP, simulation results are directly compared with the experimental results by temperature distribution in the AMR. The model and simulation results predict temperature distribution of the AMR properly at cyclic steady-state. 相似文献