Testing equipment and testing method for centrifugal pump was introduced,and experimental steady-state hydraulic performance during changing outletangle was obtained through changing outlet angle and the result was discussed at the end.

The theoretical and experimental research and the numerical simulation are introduced while the discharge angle of the vane is changed.

The test studies of the axial flow type gas-liquid cyclone with the outlet angles of guide vane of 15°, 20°, 25° and 30° show that in the dilute flow, the separation efficiency of guide vane with angle of 25° is the highest one, and guide vane with angle of 15° is the lowest.

After analyzing the pressure characteristics, the velocity distribution, the interface migration and the outlet bending angle of the two melts in the bicomponent spinning, the article got a basic principle about the shaping of “islands” and its distribution in the cross section of the Sea-island fiber.

Quite good effect is gained from broadening the angle of entry of the piercing mill and narrowing the angle of departure of the roller,by which the efficiency of piercing is increased and per unit energy consumption is reduced.

Basing on a great deal of calculation,study how the pump structure parameters influence the performance curve of mixedflow pump, such as the adjustment of the blade inlet and outlet angle、the magnitudeof the inlet edge curvaturea.