研究结果表明，流场中主要的熵增区域为吸力面角区，原因在之前讨论过：是由于叶顶泄露流和吸力面二次流以及上壁面低能流体在吸力面角区位置汇聚产生损失。沿着流动方向，熵增区域逐渐发展，在叶轮出口已经占据流道大部分位置。初始方案中，在分流叶片进口位置熵值出现了突升，之后熵值有所下降，随着相对叶顶长度的增加，叶顶泄露流的影响逐渐加大，叶顶熵峰值逐渐变大，高熵值区域逐渐变大。在x/s_m=1.1位置，流体已经流出了叶轮出口，此截面完全处于熵增区域，叶顶的熵值要大于叶根部。优化方案中，分流叶片的进口位置熵值要小于初始方案，由此看来改型方案分流叶片进口不匹配现象得到改善，下游位置的叶顶泄露流造成的损失与初始方案相比更小，熵增区域更小，熵的峰值更低，在x/s_m=1.1位置处仍熵增现象被削弱，所以优化方案的效率要高于初始方案。

The research results show that the main area of entropy increase in the flow field is the suction surface Angle region, which is caused by the convergence of tip leakage flow, secondary flow on the suction surface and low energy fluid on the upper wall at the suction surface Angle region. Along the flow direction, the area of entropy increase gradually develops and occupies most of the position of the flow channel at the impeller outlet. In the initial scheme, the entropy at the inlet of the shunt blade showed a sudden rise, and then the entropy decreased. With the increase of the relative tip length, the influence of tip leakage flow gradually increased, the peak of tip entropy gradually increased, and the region with high entropy gradually increased. At the position x/s_m=1.1, fluid has flowed out of the impeller outlet, and this section is completely in the area of entropy increase, and the entropy value of the tip of the blade is greater than that of the root of the blade. In the optimization scheme, the entropy of inlet position of the diverter blade is smaller than that of the initial scheme, so it can be seen that the mismatch of inlet of the diverter blade in the modified scheme is improved. Compared with the initial scheme, the loss caused by the tip leakage flow in the downstream position is smaller, the entropy increase area is smaller, and the peak entropy is lower. The entropy increase phenomenon is still weakened at the x/s_m=1.1 position. Therefore, the efficiency of the optimized scheme is higher than that of the initial scheme.