 The numerical simulations of a centrifugal compressor were conducted using two types of bent pipes, a 90-degree bent pipe, P90, and a z-shaped bent pipe, PZ. The results showed that the adoption of these bent pipes reduced the performance of the centrifugal compressor, with the PZ type reducing performance more than the P90 type. Additionally, the pressure ratio and efficiency of the centrifugal compressor decreased with the increment of distortion which increased with the flow rate. The distortion areas of the total pressure and axial velocity at the inlet of the impeller were found to be near 72 to 144 degrees and 288 to 360 degrees for P90, while they were closer to 108 to 180 degrees and 360 to 480 degrees for PZ. This indicates that the flow with a high distortion degree entering the impeller creates a larger area with high turbulence, kinetic energy, leading to an increase in the flow loss. This article was authored by Xingli, Ninghuang, Guanyin Chen, and others. We are article.tv, links in the description below.