High Performance Flight Cryocooler Compressor

Bailey, Paul B.; Dadd, Mike; Hill, Nikolas; Cheuk, C. F.; Raab, J.; Tward, E.

doi:10.1007/0-306-47112-4_22

Cited by 16 publications

(15 citation statements)

References 2 publications

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“…For example, by the end of 2013, there were sixteen space SPTCs made by Northrop Grumman Aerospace Systems (NGAS) operating in orbit without performance degradation, and two of them had already continuously operating for more than 15 years [20]. All of the above NGAS SPTCs were driven by moving-coil linear compressors [14,20,43,47]. …”

Section: Moving-coil Designmentioning

confidence: 99%

“…In other words, the clearance gap actually acts as a dynamic seal for the working fluid in the system. If the amplitude of the flow rate through the clearance seal is small enough compared with the amplitude of the flow rate between the compressor and the cold head, the power lost through the clearance should be negligible compared with the total power delivered by the piston [33,34,[40][41][42][43].…”

Section: Clearance Seal Conceptmentioning

confidence: 99%

“…clearance seal and flexure springs, were put forward by the researchers from the Oxford University at the time of the invention [40][41][42][43].…”

Section: Oxford-type Compressormentioning

confidence: 99%

“…The clearance seal, which refers to the radial clearance between piston and cylinder is always maintained during operation, can effectively achieve the dynamic seal between the piston and cylinder while avoiding any contact of them, thus radically eliminating the source of rubbing wear and the necessity of oil lubrication [33,34,[40][41][42][43]. The clearance seal is maintained by the mechanical suspension system mainly constituted by flexure springs, which are then manufactured by the appropriate material and designed with the peak stress safely below its fatigue limit so that the mechanical suspension system has a theoretically infinite life.…”

Section: Oxford-type Compressormentioning

confidence: 99%

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Development of high performance moving-coil linear compressors for space Stirling-type pulse tube cryocoolers

Dang

2015

Cryogenics

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Section: Moving-coil Designmentioning

confidence: 99%

Section: Clearance Seal Conceptmentioning

confidence: 99%

“…clearance seal and flexure springs, were put forward by the researchers from the Oxford University at the time of the invention [40][41][42][43].…”

Section: Oxford-type Compressormentioning

confidence: 99%

Section: Oxford-type Compressormentioning

confidence: 99%

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Development of high performance moving-coil linear compressors for space Stirling-type pulse tube cryocoolers

Dang

2015

Cryogenics

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“…Linear alternators with flexure bearings and clearance seals can be used to convert thermoacoustic engine acoustic power to electricity, which can achieve a transduction efficiency up to 90% [9,10]. A thermoacoustic generator combines the advantages of a thermoacoustic engine and a linear alternator to generate electricity from low temperature heat sources with high efficiency and high reliability.…”

Section: Introductionmentioning

confidence: 99%

A two-stage traveling-wave thermoacoustic electric generator with loudspeakers as alternators

Kang

Cheng

et al. 2015

Applied Energy

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This paper presents the design, construction and tests of a traveling-wave thermoacoustic electric generator. A two-stage travelling-wave thermoacoustic engine converts thermal energy to acoustic power. Two low-impedance linear alternators (i.e., audio loudspeakers) were installed to extract and convert the engine's acoustic power to electricity. The coupling mechanism between the thermoacoustic engine and alternators has been systematically studied numerically and experimentally, hence the optimal locations for installing the linear alternators were identified to maximize the electric power output and/or the thermal-to-electric conversion efficiency. A ball valve was used in the loop to partly correct the acoustic field that was altered by manufacturing errors. A prototype was built based on this new concept, which used pressurized helium at 1.8 MPa as the working gas and operated at a frequency of about 171 Hz. In the experiment, a maximum electric power of 204 W when the hot end temperature of the two regenerators reaches 512℃ and 452℃, respectively. A maximum thermal-to-electric efficiency of 3.43% was achieved when the hot end temperature of the two regenerators reaches 597℃ and 511℃, respectively. The research results presented in this paper demonstrate that multi-stage travelling-wave thermoacoustic electricity generator has a great potential for developing inexpensive electric generators.

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Scaling of Cryocooler Compressors

Bailey

Dadd

Cheuk³

et al. 2003

Cryocoolers 12

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The successful HEC cryocooler compressor has been used as the basis for two very similar compressors, one smaller and one larger than the original. The new compressors were designed largely by a direct scaling of the original. This paper describes from first principles how some of the design parameters are affected by scaling, and how this will impose limitations on machines at extreme ends of the size range.The three sizes of compressor are compared, and some of the practical problems encountered during the scaling process are mentioned.

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High Performance Flight Cryocooler Compressor

Cited by 16 publications

References 2 publications

Development of high performance moving-coil linear compressors for space Stirling-type pulse tube cryocoolers

Development of high performance moving-coil linear compressors for space Stirling-type pulse tube cryocoolers

A two-stage traveling-wave thermoacoustic electric generator with loudspeakers as alternators

Scaling of Cryocooler Compressors

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