冷头温度对新型气动分置式斯特林制冷机运行性能影响的研究

介绍了气动分置式斯特林制冷机性能实验样机的组成、主要结构参数和试验结果,并对试验结果进行了分析,在新型气动分置式斯特林制冷机运行中,冷头起着进行负反馈调节的桥梁作用。     

狭缝调相式气动分置式斯特林制冷机的运行性能

本文首先介绍了我们提出的具有狭缝调相器的气动分置式斯特林制冷机 ,并与传统气动分置式斯特林制冷机进行了对比 ,最后给出并分析了整机性能试验结果 ,试验证明该制冷机可以满足在液氮温区工作的需要     

6W@80K气动分置式斯特林制冷机轻量化设计和性能优化

介绍了一台由中国科学院上海技术物理研究所研制的6 W@80 K气动分置式斯特林制冷机样机,主要包括压缩机的轻量化设计和整机制冷性能的优化。该制冷机包括动磁式直线压缩机和气动膨胀机,制冷机整机质量为5.5 kg。压缩机采用两个对置布置的动磁式直线电机驱动,板弹簧支撑和无摩擦的间隙密封技术。经过对直线压缩机的结构优化,在6 W@80 K的制冷性能下,压缩机的输入电功从原来的163 W降低到106 W。     

分置式斯特林制冷机参数的优化

本文建立了分置式斯特林制冷机的优化设计模型，讨论了分置式制冷机的特点、优化设计及其数学模型中的特殊问题，考虑了制冷机中存在的主要冷量损失和直接功耗损失，选用了制冷机的12个主要结构和运行参数作为设计变量。实例计算中得到的优化结果与实验统计数据吻合较好。     

分置式斯特林制冷机排出器运动阻尼的在线辨识

依据伪随机相关分析方法对分置式斯林制冷机排出器的运动阻尼进行了在线辨识，提出了经过优化的辨识实验方案，辨识结果揭示了制冷机降温过程中排出器运动阻尼随制冷温度下降的重要变化特征。     

气动分置式斯特林制冷机的等温模型分析

涉及的气动分置式斯特林制冷机实验性能为40 W输入80 K/1 W,是上海技术物理研究所三期创新研究项目,本文采用等温模型对该制冷机的制冷性能进行理论计算,计算结果与实验值基本一致。另外,还对制冷机一些参数对理论制冷量、冷损、有效制冷量等的影响进行分析,为合理选取这些参数提供理论依据。     

电磁驱动分置式斯特林制冷机综合网络模型

根据系统动力学建立了电磁驱动分置式斯特林制冷机整机的综合网络模型。该模型综合分析了电磁驱动分置式斯林特制冷机的流体网络，热声网络以及机电网络的有关研究成果，并加以完善，比较全面地反映了电磁驱动分置式斯林制冷机各个方面的动态特性，以此为基础编制的制冷机整机仿真程序，为分置式斯林特林制冷机的整机优化设计，离线调机，在线控制等行为提供了依据。     

1W/80 K分置式斯特林制冷机的试验研究

介绍了1W/80K分置式斯特林制冷机的试验研究，该机在80K时制冷量为1.3W，降温时间小于5min（350J热负载）。     

分置式牛津型斯特林制冷机的数值分析与实验验证

对分置式牛津型斯特林制冷机进行了数值计算 ,介绍了计算模型考虑到的众多不可逆因素。通过对计算结果与实验结果的对比 ,验证了本文数值计算的准确性 ,说明本文计算模型与数值处理方法是切实可行的     

双级斯特林制冷机热力分析

基于热力学第一定律,分析了双级斯特林制冷机两级之间冷量分配的关系式,以及冷量与压缩机功耗之间的关系.通过商业计算软件,对制冷机内部能量流进行模拟计算,结合实例定量给出制冷机各部分的损失.     

Numerical analysis on performance and contaminated failures of the miniature split Stirling cryocooler

A mathematical model based on thermodynamic theory of variable mass is developed for the split Stirling refrigerator, in which, the whole machine is considered by one-dimensional approach while the processes in the regenerator are simulated by two-dimensional approach. First, the influence of the ideal frost layer distributions on the flow and heat transfer in the regenerator and the performance of the Stirling cryocooler are simulated. Then, the distribution of the contaminated water vapor and its coagulated and deposited process is qualitatively analyzed. Finally, the lifetime of the refrigerator is evaluated based on the calculated data. The results show that when the refrigerator is operated at uniform distribution of the water vapor partial pressure in the regenerator, the cooling capacity is reduced over 10% at about 631 h, and the power consumption of compressor is increased over 20% at about 1168 h. However, for the linear distribution of water vapor partial pressure, the refrigerator can work properly because the frost never reaches the criterion of failure. Also, it is found that when the Stirling cryocooler restarts after a shutdown, the cooling capacity is reduced by 10% once the frost mass is over 7.05 mg, and there is no cooling capacity once the frost mass reaches 41.2 mg.     

The thermodynamic characteristics of a Stirling/pulse tube hybrid cryocooler

A Stirling/pulse tube hybrid cryocooler (SPC), comprised of a Stirling cryocooler as the first stage and a pulse tube cryocooler as the second stage, features the ability of shifting cooling capacity between stages by adjusting the movement of the displacer in the first stage. Such an ability allows an SPC to accommodate itself to time-varying heat loads at different temperatures, which makes it a competitive candidate in space applications. However, due to the gas coupling, there exists a significant mutual effect between stages which endows an SPC with special thermodynamic characteristics and has a significant effect on the SPC’s capability of shifting cooling capacity between stages. With the phasor analysis and the thermodynamic analysis, this paper establishes an idealized model of an SPC. The model is then used to study the effect of the second stage on the first stage and reveal the condition that an SPC is able to shift cooling capacity between stages. Also, the model is compared with a Sage numerical model and the two models are consistent on the overall trend. Though it is unable to reflect reality precisely, the idealized model can interpret the mechanism and highlight some of the essential nature of an SPC, which will eventually benefit the appropriate design of an SPC.     

牛津型斯特林制冷机的动力特性分析

为了提高牛津型斯特林制冷机的制冷效率,提出了一种应用数值软件进行动力特性研究的方法。总结分析了压缩机、膨胀机的板弹簧刚度和活塞质量,充气压力,膨胀机位移相位角,膨胀机活塞行程以及制冷温度对制冷机动力特性的影响规律。优化了制冷机的动力系统,实验验证了该方法的可行性。研究结果表明,优化后制冷机的压缩机电机效率和整机效率均有所提高。     

Cooling capacity of Stirling cryocoolers — the split cycle and nonideal gas effects

The general expression for the cooling capacity of a Stirling cooler operating with a nonideal gas is derived. The result demonstrates that thermodynamic regions of negative Joule-Thomson coefficient should be avoided. It is also shown that heat transfer to the expansion space occurs during three of the four steps of the ideal Stirling cycle.     

斯特林制冷机直线压缩机共振频率与特性研究

文章主要基于斯特林制冷机直线压缩机及其相应简化物理模型,给出了压缩活塞—弹簧振动系统的动力学控制方程,就直线压缩机的共振频率及特性进行了系统分析,对整机优化设计与性能改进具有重要意义。     

5W@80K自由活塞斯特林制冷机工况及重力特性实验研究

利用现有的脉冲管制冷机性能测试实验台,针对某型号自由活塞斯特林制冷机,设计了热端水冷器并进行了性能测试.实验研究了工作频率、充气压力、输入功率等参数对制冷机性能的影响规律,结果表明斯特林制冷机的最佳运行工况为充气压力2.0 MPa,频率42 Hz.改变冷头在竖直方向和水平面不同的朝向,实验结果表明冷头竖直向下时最低制冷...