Impeller rotation angular velocity and flow into a linear relationship, the measured angular velocityofrotation can be measured flow value.
叶轮的旋转角速度与流量成线形关系,测得旋转角速度就可测得流量值。
2
Concretely, this curl gives you the angular velocityof the rotation, well, with a factor two but that doesn't matter, and the axis of rotation, the direction of the axis of rotation.