以某高负荷离心压气机为研究对象,进行管式扩压器设计,借助于数值模拟的方法,对影响扩压器性能的重要参数———喉部面积进行参数化研究,并详细分析了管式扩压器特殊的进口结构对压气机内部流场的影响,初步探讨了管式扩压器喉部设计准则,摸清其提高效率扩大稳定工作范围的机理. Taking a high-load centrifugal compressor as the research object, the design of tubular diffuser was carried out. By means of numerical simulation, the throat area, an important parameter affecting the diffuser performance, was parametrically studied and analyzed in detail The special inlet structure of tube diffuser affects the internal flow field of the compressor. The design criterion of the tube diffuser throat is preliminarily discussed, and the mechanism of improving the efficiency and expanding the stable working range is found out.