Abstract Lockheed Martin has developed a two-stage pulse tube cryocooler under contract to the Air Force Phillips Laboratory. The cooler is an intermediate bypass design in an in-line configuration. At a reject temperature of 295 K, the cooler simultaneously produced 0.6 W at 56 K and 0.32 W at 35 K. With no heat load on either stage, the cold stage reached 23 K and the intermediate stage reached 48 K. This cooler was driven by a 10.9 cm 3 swept volume flexure bearing compressor, developed by Lockheed Martin for low-cost cryocooler applications. We also observed evidence of dc mass flow through the intermediate capillary and speculate that this resulted in some loss in second-stage cooling power. We observed unstable behavior of the second-stage temperature which we also attribute to dc flow. We evaluated an etched foil regenerator. While analysis suggested significant improvement with this technology, tests in both pulse tubes and Stirling-cycle coolers showed poorer performance compared to the conventional screen regenerators. As part of this contract we also evaluated linear flexures for reduction of lateral exported compressor vibration. In a direct comparison with spiral flexures in the same compressor, the linear flexures reduced the lateral vibrations by a factor of three to four for the higher harmonics.


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    Title :

    Performance of a Two-Stage Pulse Tube Cryocooler for Space Applications


    Contributors:
    Olson, J.R. (author) / Kotsubo, V. (author) / Champagne, P.J. (author) / Nast, T.C. (author)

    Published in:

    Publication date :

    2002-01-01


    Size :

    8 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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