图中，横坐标M表示距离叶顶和叶根的位置，“0”表示在叶根处，“1”表示在叶顶处。可知叶片出口熵值整体均有下降，但是在叶顶附近下降较为明显，因此优化后对叶顶附近的流场整体有明显的改善，这与子午面熵分布图吻合。

In the figure, the horizontal coordinate M represents the position from the tip of the blade and the root of the blade, "0" represents the root of the blade, and "1" represents the tip of the blade. It can be seen that the overall entropy of the blade outlet decreases, but the decrease is more obvious near the blade tip. Therefore, the overall flow field near the blade tip is significantly improved after optimization, which is consistent with the meridian plane entropy distribution diagram.