The inner flow field of a rotational flow selfpriming pump was simulated based on large eddy simulation（LES）with threedimensional nonstructural mesh and finite volume method, and proper boundary conditions were determined according to this issue. The commercial CFD software Fluent was applied. The distribution of inner flow field within pump and boss region nearby was obtained. In order to study the influence of boss structure with different parameters, computation of performance prediction was carried out under several different operating conditions, and the performance curves were obtained. According to the numerical results, the relations between the inner flow field within boss region and the overall characteristics were investigated based on the performance curves. The influence of boss structure on performance was revealed by comparing the external characteristics with different boss parameters. It is found that boss structure has greater impact on head and efficiency, but lesser impact on shaft power. The optimal value of boss parameters can be obtained by use of CFD aided design and comparative analysis of performances with different boss structure parameters, which can provide a reference for pump optimal redesign.
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