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In turbomachinery, the slip factor is a measure of the fluid slip in the impeller of a compressor or a turbine, mostly a centrifugal machine. Fluid slip is the deviation in the angle at which the fluid leaves the impeller from the impeller's blade/vane angle. Being quite small in axial impellers(inlet and outlet flow in same direction), slip is a very important phenomenon in radial impellers and is useful in determining the accurate estimation of work input or the energy transfer between the impeller and the fluid, rise in pressure and the velocity triangles at the impeller exit.
A closed impeller and a manufacturing method thereof
The application discloses a closed impeller and a manufacturing method thereof. The closed impeller comprises an impeller body and secondary splitter blades. The impeller body comprises a disc and a cover arranged oppositely. A plurality of main blades and a plurality of primary splitter blades are connected between the disc and the cover. An airflow channel is formed between the disc, the cover, the main blades and the primary splitter blades. The inner walls on both sides of the airflow channel define a pressure surface and a suction surface respectively. The airflow channel forms an outlet at the side wall of the impeller body. The secondary splitter blades are arranged obliquely at the outlet of the airflow channel. Along the width direction of the airflow channel, the secondary splitter blades are closer to the suction surface than the center line of the airflow channel. By arranging the secondary splitter blades, the secondary flow and the wake vortex at the outlet of the impeller are directly intervened and weakened, so that the flow loss is reduced, the slip factor is improved, and the efficiency and overall working performance of the impeller are improved.
Owner:INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI