Comparative Study on Performance of Regenerator for Miniature Pulse Tube Cryocooler with Metal Matrix Materials at Ultra High Frequencies

2021 ◽  
Author(s):  
Chetan O Yadav ◽  
P. V. Ramana
Keyword(s):  
Stainless Steel ◽  
Wire Mesh ◽  
Total Power ◽  
Cooling Power ◽  
Filler Materials ◽  
Pulse Tube ◽  
High Frequencies ◽  
Mesh Screen ◽  
Pulse Tube Cryocooler ◽  
Copper Mesh

A Miniature Pulse Tube Cryocooler (MPTC) is the first selection for the cooling of IR sensors, infrared detectors, etc. in space technology. The regenerator is one of the key components to operate an MPTC at high efficiency. The objective of this study is to explore the possibilities of the different matrices as regenerator filler materials for MPTC operating at ultra-high frequencies. REGEN 3.3 is one of the best software available for the design and optimization of cryocooler regenerators. We have used REGEN 3.3 for numerical simulations of the three different regenerator matrix materials viz. stainless steel wire mesh screen (SS 635#), brass wire mesh screen (500#) and copper wire mesh screen (500#) at the hot end and cold end temperatures of 300[Formula: see text]K and 80[Formula: see text]K for COP, cooling power, total power losses and pressure losses, at an ultra-high frequency of 100[Formula: see text]Hz and 200[Formula: see text]Hz. The simulation results depict that the regenerator using stainless steel mesh screen shows better results than that of the brass mesh screen and copper mesh screen at 100[Formula: see text]Hz. However, the performance of brass mesh screen and copper mesh screen performs better than the stainless steel at 200[Formula: see text]Hz. Therefore, the proposed matrix materials can be used as regenerator materials for the MPTC at ultra-high frequencies with better performances.

Affecting the Gross Cooling Power of a Pulse Tube Cryocooler with Mass Flow Control

2003 ◽  
pp. 337-342 ◽  
Author(s):  
A. Waldauf ◽  
T. Schmauder ◽  
M. Thürk ◽  
P. Seidel
Keyword(s):  
Flow Control ◽  
Mass Flow ◽  
Cooling Power ◽  
Pulse Tube ◽  
Pulse Tube Cryocooler

Experimental Evaluation of a Metal Mesh Bearing Damper in Parallel With a Structural Support

2001 ◽  
Author(s):  
Eyad M. Al-Khateeb ◽  
John M. Vance
Keyword(s):  
Stainless Steel ◽  
Wire Mesh ◽  
Squeeze Film ◽  
Hysteretic Model ◽  
Metal Mesh ◽  
Critical Speeds ◽  
Squirrel Cage ◽  
Hysteretic Damping ◽  
Damping Model ◽  
Copper Mesh

In a previous ASME paper experiments were reported on metal mesh bearing dampers (MMD) that were tested in a power turbine rotor at speeds up to 12,000 rpm. They were made of 0.229 mm stainless steel 304 wire mesh, compressed to 57% density, which is close to the maximum density that was economically available. After balancing, a level of vibration was achieved similar to that previously observed with squeeze film dampers. These experiments showed that the MMD could suppress vibration amplitudes of the 22.7 kg rotor at critical speeds of 4,000 rpm and 9,300 rpm. Much of the testing showed the rotor having little or no response to unbalance on coastdown through the critical speeds. The donut-shaped MMD in those tests were the only bearing supports; no squirrel cages were used. A question was raised about the feasibility of using MMD in parallel with a squirrel cage bearing support so that the stiffness can be controlled independently of the damping. This paper presents experimental results for metal mesh dampers with a squirrel cage as a parallel bearing support. Experiments with copper mesh as seal elements (on another project) had indicated that copper mesh has higher damping than stainless steel, so copper was chosen for these experiments. Both a linear viscous damping model and a hysteretic damping model were investigated. Some hysteretic damping models predict that damping depends on stiffness. A different hysteretic model turned out to be useful and promising as a prediction model for two reasons: a) it fits the measured data, and b) it predicts that the damping is not lost if the MMD is put in parallel with a steel structure such as a squirrel cage bearing support. The measurements reported here support the validity of that prediction.

Effect of Pressure Wave Generator Characteristics on Pulse Tube Cryocooler Performance

2008 ◽  
Author(s):  
A. Jafarian ◽  
M. H. Saidi ◽  
N. Sarikhani ◽  
S. K. Hannani
Keyword(s):  
Pressure Wave ◽  
High Capacity ◽  
Superconducting Devices ◽  
Cooling Power ◽  
Pulse Tube ◽  
Pressure Amplitude ◽  
Linear Temperature ◽  
Effect Of Pressure ◽  
Pulse Tube Cryocooler ◽  
Wave Generator

Recent developments of superconductive industry require cryocoolers with cooling power higher than one Watt in the 70–80 K temperature range. High capacity pulse tube cryocoolers assure the cooling power required for operation of superconducting devices. The purpose of this paper is to investigate the influence of the pressure wave generator on high capacity pulse tube cryocooler performance. In this respect the hydrodynamic and thermal behavior of the cryocooler is explained by applying the mass and energy balance equations to different components of the cryocooler cycle. A linear temperature profile is assumed in the regenerator and nodal analysis technique is employed to simulate the tube section behavior numerically. Employing the proposed model the effect of pressure wave characteristics at the inlet boundary, namely, the Stirling type and G-M type pressure inlet on cryocooler performance are investigated. The influence of Pressure amplitude, frequency and swept volume is studied as well.

Investigation of a Stirling-type pulse tube cryocooler with 100 W-class cooling power at 77 K

2014 ◽  
Author(s):  
L. M. Zhang ◽  
J. Y. Hu ◽  
Y. Y. Chen ◽  
E. C. Luo ◽  
W. Dai
Keyword(s):  
Cooling Power ◽  
Pulse Tube ◽  
Pulse Tube Cryocooler

Investigation on the cool-down speed of Stirling type pulse tube cryocooler with inertance tube

2021 ◽  
Author(s):  
Cungang Yan ◽  
Wei Dai ◽  
Yanang Wang ◽  
Xiaotao Wang ◽  
John M. Pfotenhauer ◽  
...  
Keyword(s):  
Pulse Tube ◽  
Pulse Tube Cryocooler
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