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通过亚音扩压器内壁面流谱图、有关截面的总压恢复分布图、速度矢量图以及各壁面沿程静压恢复系数分布分析对比了四种进气状态下矩形大Ｓ弯扩压器流动特性。试验表明不同进气状态对矩形大Ｓ弯扩压器性能有很大影响，其中均匀核心流进气条件下的流动代表了大Ｓ弯扩压器流动的一般特征，其出口平均总压恢复系数最高，周向总压畸变指数不大，旋流很弱。研究腹部或两侧进气道地面起飞进气状态下矩形大Ｓ弯扩压器的流动特性更具有实际意义。试验表明其出口平均总压恢复系数较低，周向总压畸变指数较大，旋流较强且很不规则。
Through the analysis of the flow spectrum of the inner wall of the subsonic diffuser, the total pressure recovery profile of the cross section, the velocity vector and the distribution of the static pressure recovery coefficient along each wall, four large S-bend diffusers Flow characteristics. The experimental results show that different inlet conditions have a great influence on the performance of rectangular large S-bend diffusers. The flow in a homogeneous core-inflow condition represents the general characteristics of large S-bend diffuser flow. The average total pressure recovery coefficient Highest, circumferential total pressure distortion index is not large, cyclonic very weak. It is more practical to study the flow characteristics of large S-bend diffusers under the condition of take-off or air inlets on both sides of the abdomen or both sides. The test shows that the average total pressure recovery coefficient of the outlet is lower, the circumferential total pressure distortion index is larger, the swirling flow is stronger and irregular.