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By calculating fluid dynamics (CFD), the flow field of several shaft center breathers in different structure has been researched in detailed. Computational domain is simplified according to the actual requirement. RSM turbulent model is used to simulate the strongly swirling turbulent flow field of the shaft center breather. It is proved that the final results of numerical simulations have certain reliability, which could be used to study the resistance characteristic affected by structure parameters.This paper also analyzes the shaft center breather velocity fields and total pressure distribution, focus on a case that pressure on import and export along with total pressure loss. By contrast, the increasing eccentric arm brings more pressure loss at the same rotational speed, in other words, the resistance in the shaft center breather gets bigger. In addition, the increase of rotational speed leads to the increase in pressure loss at the same eccentric arm, and the increase of rotational speed gets more significant impact on the shaft center breather with the bigger eccentric arm. The results of the study contribute to an optimized shaft center breather technology.

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