15 K pulse tube design for ECHO mission

Duval, Jean-Marc; Charles, I.; Chassaing, Clément; Butterworth, James; Aigouy, G.; Mullié, J.

doi:10.1063/1.4860747

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…It is composed of a coaxial pulse tube cold finger, precooled at 2 intermediate locations by an external cooler, in this case a Gifford Mc-Mahon refrigerator. Results obtained with more standard phase shifters such as active phase shift, inertance or inertance +V2 are largely described in [18]. Active phase shifters imply the use of a secondary compressor actively controlled and connected at the location of the inertance.…”

Section: Operation With a Low Temperature Pulse Tube Coolermentioning

confidence: 98%

Innovative phase shifter for pulse tube operating below 10 K

et al. 2016

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Section: Operation With a Low Temperature Pulse Tube Coolermentioning

confidence: 98%

Innovative phase shifter for pulse tube operating below 10 K

et al. 2016

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“…The advantage of operating the cryocooler in a coaxial configuration is the reduction of volume and enhanced ease of integration between the cold head and the cooling interface [5] [6] [7]. Hence, it is of great practical use to determine the effectiveness of integrating an efficiency-enhancing active displacer into an SPTC in a coaxial configuration.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of a coaxial Stirling pulse tube cryocooler with an active displacer for space applications

et al. 2020

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A numerical model for a coaxial Stirling pulse tube cryocooler with an active displacer has been developed. An active displacer, in place of an inertance tube, has already demonstrated good efficiency in an in-line pulse tube, but incorporating this design into a coaxial configuration permits better access to the cold head. A model of the coaxial cold head was developed to include the radial flow and cooling in this region. The subassembly models were validated with flow testing of the physical sub-units of the cryocooler. The performance has been predicted for the cryocooler as a function of: fill pressure, operating frequency, and phase angle between the position of the linear compressor and displacer. The projected difference in performance and efficiency of the coaxial configuration was compared to the in-line design. The coaxial cryocooler numerically simulates 6 W of cooling at 80 K with an input power of 85 W, at a fill pressure of 28 bar, an operating frequency of 60 Hz, and a compressor-displacer phase angle of 41º. Overall, the coaxial cryocooler outperforms the in-line design in terms of cooling power, but not in terms of efficiency.

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