The possibility of the filling of cavities on a rotor blade with liquid

The possibility of the filling of cavities on a rotor blade with liquid and its effect on blade erosion are analyzed by considering several phenomena. These include: dynamic filling of a cavity with liquid from the gas-droplet stream and ejection of the liquid from the cavity by inertial forces; retention of liquid in a cavity by surface tension forces; the degree of filling of a cavity whose axis is not parallel to the rotation axis of the rotor; and the degree of filling of a cavity with liquid from a film moving toward the blade periphery. The analysis indicates that moisture may be present on the surface of rotating blades and also in the depressions of an erosion surface in amounts that are sufficient for a partial damping of droplet impact. This should be taken into account in predicting the erosion resistance of rotor blades.