《Tab.3Specific results of different axial depth of circumferential 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 14 shows the relative velocity vector and entropy distribution in CGCT at near-stall point.The CGCT with14mm axial depth has the lowest efficiency at near-stall point，which influences by the highest total entropy value shown in Figure 14.The low momentum fluid is sucked into the CGCT with the effect of adverse pressure gradient，one counter clockwise vortex appears in the groove and the core of it locates at the centre of the groove.According to the entropy distribution in Figure 14，the zone with high entropy is mainly at the top of the CGCT.Compared the relative velocity vector and entropy distribution between CGCT with different axial depth，it can be found that the suction effect of CGCT“14_6_139”are greater than the CGCT“6_6_139”and“10_6_139”.Besides，the maximum entropy value appears in CGCT“10_6_139”rather than CGCT“14_6_139”，which makes the mixing space greaten to reduce the losses with the increased axial depth.