《Tab.2 Specific results of different radial location of circumferen-tial grooves》

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《离心压缩机周向槽壁面处理的数值研究（英文）》

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Figure 8 shows the relative velocity vector and entropy distribution at the inlet of groove for CGCT No.2 and No.3at near-stall point.It can be seen from the figure that，for the treated casing diffusers，the fluid in the tip of diffuser passage is sucked into the groove，which shrinks the area of the tip fluid separate region，and the fluid velocity in the tip region increases.The entropy value at the inlet section of CGCT No.2 is greater than CGCT No.3，which has the similar results with cross sections in Figure 7.