Set this wing hung in the fluid, the fluid with a certain speed when passing through the wing surface, negative pressure, positive pressure back wing, the positive and negative pressure and the size of the wing and the angle of attack (wing back angle and flow direction of the fluid velocity) and the size of the.
If the fluid does not move, and the wing is moving at the same speed as the fluid, the wing back and the wing face are subjected to the same positive pressure and negative pressure as the front wing surface (wing). Under this pressure, the wing will gain lift.
If the wing shaped blade is fixed on the rotary shaft, forming a propeller, which can not move along the axial direction, when the shaft rotates at a high speed, wing (propeller side) due to the negative pressure and suction flow, positive pressure and wing back for drainage, so a row caused by the liquid (or gas flow). This is the working principle of axial flow pump.
Axial flow pump is a single screw pump with high specific speed, the speed ratio is generally 500~1200. Features are large flow, low head, high efficiency, small size of the pump. Common axial flow of the head is generally 4~15m, there is little more than 25m. Application of a wide range of axial flow pump in plain river network area in China pumping-sta.
