Manufacturing method and uniqueness of bending the backward curved centrifugal impeller

- Jan 31, 2019-

The analysis of the measured results of the backward curved centrifugal impeller shows that the existence of the fluid viscosity and the large flow gradient and the lateral pressure gradient in the centrifugal impeller provide favorable conditions for the growth and full development of the secondary flow in the wheel.
 
The main performance of the backward curved centrifugal impeller is that the boundary layer fluid adhering to the surface of the blade caused by the pressure difference between the wheel and the wheel cover migrates along the surface of the blade from the surface of the blade to the surface of the wheel cover; One is between the blade pressure surface and the suction surface of each vane passage, and the boundary layer fluid attached to the surface of the disc and the surface of the wheel cover is respectively caused by the pressure difference in the normal direction of the main flow direction, The surface of the cover flows from the pressure surface to the suction surface.
 
Under the direct action of the secondary flow and the interaction between the secondary flow and the mainstream, the flow field distribution at the outlet portion of the centrifugal impeller becomes very uneven. In order to solve this problem, the centrifugal impeller is designed to be bent backwards, so that the efficiency of the impeller and the stage can be improved, the "jet-tail structure" can be weakened, and the "tail area" can be reduced to avoid or delay the flow separation as much as possible.

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