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Numerical estimation of piston's overleaks impact on microcryocooler efficiency.

Number: 0010

Author(s) : SHISHOVA N., ARKHAROV I., NAVASARDYAN E., ZHALYALETDINOV R.

Summary

A mechanical wear of the piston-cylinder pair of the discharge cavity is the frequent cause of malfunction and failure in cryocoolers. This paper presents the results of numerical simulation of the process of the working substance (helium) overleaks through the 6 μm gap between the piston and the cylinder, and an assessment of influence of these losses on the refrigerating capacity and Carnot efficiency of the cryocooler in the rotor's speed range 1600 ... 3000 rpm and filling pressures 25 … 40 bar.  Obtained results make possible the determination the dependence of the overleaks size and the Reynolds number in the piston-cylinder gap at various combinations of the filling pressure and rotational speed, which, by authors meaning, will allow to solve the problem of optimizing the gap value by minimizing of overleaks while the bearing capacity of the gas-static layer and energy performance of cryocooler keep idem.

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Pages: 9

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Details

  • Original title: Numerical estimation of piston's overleaks impact on microcryocooler efficiency.
  • Record ID : 30029006
  • Languages: English
  • Source: Cryogenics 2021 online. Proceedings of the 16th IIR International Conference, October 5-7, 2021.
  • Publication date: 2021/10/05
  • DOI: http://dx.doi.org/10.18462/iir.cryo.2021.0010
  • Document available for consultation in the library of the IIR headquarters only.

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