There is low speed area near the axle, its radial s peed field is small but still exists beyond the blade radius.

其径向速度虽然在桨径范围内较小，但在桨径外仍有一定值。

youdao

There is low speed area near the axle, its radial s peed field is small but still exists beyond the blade radius.

其径向速度虽然在桨径范围内较小，但在桨径外仍有一定值。

youdao