通过对渐扩管流动特性的理论分析与试验研究，其结果发现：渐扩管元件对管道和系统的作用不仅和全身尺寸有关，而且也和安装位置有关。设计不合理的渐扩管使管道系统产生再生气流噪声，同时使管道系统气流引起更大脉动，造成整个系统振动，利用Fluent软件仿真分析为渐扩管的合理设计提供了可靠的参考资料，具有重要的工程应用价值。(Through the theoretical analysis and experimental study of the flow characteristics of the diffuser, it is found that the effect of the diffuser on the pipe and system is not only related to the overall size, but also related to the installation position. The unreasonable design of diffuser causes the noise of regenerative air flow in the pipe system, and makes the air flow in the pipe system more pulsating, causing the vibration of the whole system. The simulation analysis by Fluent software provides reliable reference for the rational design of the diffuser and has important engineering application value.)