Hydraulic energy jump in axial flow turbomachinery

摘要

Hydraulic energy jump is caused at the location between the flow passages just upstream of leading edge of impeller inlet and the leading edge of impeller inlet just after the small element of fluid particles entered the rotating flow passage. Hydraulic energy jump is the largest at the tip, that is, at the casing wall, and decreases rapidly radially inward from tip to hub along the leading edge. As hydraulic energy change is caused by the radial outward movement of small element of fluid particles in the rotating flow passage of impeller blades, hydraulic energy change is not caused on the casing wall because fluid particles rotational radius does not change along the flow passage. Therefore, hydraulci energy at the leading edge of impeller inlet is equal to hydraulic energy at trailing edge of impeller outlet. Hydraulic energy jump at casing wall is caused from the level of hydraulic energy just upstream of leading edge of impeller inlet to the level of hydraulic energy at trailing edge of impeller outlet.