LIQUID TOLERANT IMPELLER FOR CENTRIFUGAL COMPRESSORS

摘要

In order to reduce erosion of an impeller due to liquid droplets in an incoming flow of gas, the impeller comprises converging-diverging bottlenecks; the incoming flow passes through the bottlenecks so that the speed of the gas at the inlet of the impeller first suddenly and substantially increases and then suddenly and substantially decreases; furthermore, the impeller is configured so that, internally after its inlet, the incoming flow is deviated gradually in the meridional plane.

主权项

1. A closed impeller for a rotary machine comprising: an inlet,
an outlet; and, a plurality of passages fluidly connecting the inlet to the outlet, wherein each of the passages is defined by a hub, a shroud and two blades, wherein each blade has a upstream portion having a thickness that first increases and then decreases, so to create a converging-diverging bottlenecks in the passage localized at the inlet of the passage, and a downstream portion having a substantially constant thickness.