In this paper, the numerical simulation of the two-dimensional and three-dimensional transient flow field in an oil-free scroll compressor is performed by the CFD dynamic mesh technique. During the procedure of simulation, the air in the scroll compressor is treated as ideal gas, and fit for the flow governing equations as well as gas state equation. In our approach, RNG k-ε model is used for turbulent model. The simulation results show that the flow field in the scroll compressor is

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... ic, in addition, the generation, motion and size change of the vortices inside the scroll compressor can be visualized. By contrasting the two-dimensional and three-dimensional flow field, the advantages and disadvantages are clearly found in simulation. The simulation not only extremely vividly reveals the scroll compressor inherent laws but also provides theoretical references for the optimal design of scroll compressors.