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采用三孔探针沿叶片扩压器轴向测量了跨盘─盖流场，获得了叶片扩压器内速度场和压力场跨盘─盖的分布特性，并分析了中、小流量时扩压器内流动的变化趋势。实验结果表明：叶片扩压器内流动是一个既扩压又均匀化的过程，随着流动向扩压器出口的发展，沿叶片吸力面侧低速流体区不断扩大，在小流量工况时靠近扩压器盘差侧出现倒流，此时最容易引起离心压缩机工作性能失稳。
The three-hole probe was used to measure the cross disk-cover flow field in the axial direction of the vane diffuser. The distribution characteristics of the velocity field and the pressure field across the disk in the vane diffuser were obtained. Pressure flow within the trend. The experimental results show that the flow in the vane diffuser is a process of both diffusing and homogenizing. With the development of the flow to the outlet of the diffuser, the low-velocity fluid zone along the suction side of the vane expands continuously. When the flow rate is low, Diffuser disk differential side backflow, this time most likely to cause centrifugal compressor performance instability.