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VACUUM ›› 2020, Vol. 57 ›› Issue (2): 8-12.doi: 10.13385/j.cnki.vacuum.2020.02.02

• Vacuum Acquisition System • Previous Articles     Next Articles

DSMC Simulation Study of Influence of Nozzle Angle on Pumping Performance of Mercury Diffusion Pump

ZHAO Chang-lian1, MAO Shi-feng1*, LIU Peng2, QIN Shi-jun2, YU Yi1, YE Min-you1   

  1. 1.Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei 230027, China;
    2.Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
  • Received:2019-03-05 Online:2020-03-25 Published:2020-04-24

Abstract: Due to the high pumping speed and continuous steady state operation, the diffusion pump is expected to be applied in the divertor pumping system in future fusion reactor to reduce the high tritium inventory in the cryogenic pump, which are widely used in present tokamaks. Because the requirement of compatibility with tritium, the commercial oil diffusion pump can not be directly applied in the fusion reactor. Instead, the mercury will be the ideal working fluid. For the purpose to support the mercury diffusion pump design in the divertor pumping system of future fusion reactor, the optimization study of the mercury diffusion pump design is necessary. In this work, using the direct simulation Monte Carlo (DSMC) method, influence of the nozzle angle on the pumping speed and mercury backstreaming rate are simulated based on a KT-150 diffusion pump structure. The simulation results show that the largest pumping speed of~1.53m3/s is achieved when nozzle angle equals 45 degrees, while the backstreaming rate is not obviously increased.

Key words: divertor pumping, direct simulation Monte Carlo(DSMC), mercury diffusion pump, pumping speed, backstreaming rate

CLC Number: 

  • TB752+.3
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