Abstract
In this paper, a stepped molecular pump is proposed, which greatly reduces the negative effect of the rotor opening on the clearance of the Holweck pumps due to the placement of the top cap inside the rotor of a gas centrifuge. The modified Sickafus relations were then extracted for the proposed stepped molecular pump and the compression ratio values for it were validated by DSMC method and experimental results. Due to the unknown molar fraction of gas components inside the space of the molecular pump, for different gases, the total space between the rotor and the casing with part of the space inside the rotor was simulated using a dsmcFoam solver. The results showed that by reducing the rotor velocity by 40%, the molar fraction of the heaviest gas (UF6) at the space above the molecular pump increases to about 20%. Also, at a certain velocity, by reducing the gas molecular weight from UF6 to Xe, the molar fraction of gas increases by 55%. Then, based on the molar fraction of the gas components predicted, it was observed that the use of a stepped molecular pump can increase the logarithm value of the compression ratio by up to 8%.
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