通过修改中弧线前后近最佳效率点的熵分布对比，可知由于效率提升较小，所以在叶片前部分，熵分布云图差别不大，出口位置和无叶扩压段部分，熵值有较明显的改善。

Through the comparison of the entropy distribution near the optimal efficiency point before and after the modification of the middle arc, it can be seen that due to the small efficiency improvement, the entropy distribution cloud map in the front part of the blade has little difference, and the entropy at the exit position and the part without the blade diffuser has obvious improvement.