Abstract
It is well known that leading edge sweep has a favorable effect on the cavitation of turbomachines. However, the mechanisms of the improvement have not been made clear. It has been shown that the lift and the drag on a cavitating swept single hydrofoil can be correlated fairly well based on the velocity component normal to the leading edge. In the present paper, such correlations for swept cascades are derived and the results are examined, neglecting the full geometrical effects of the inducer rotor. It is shown that the correlations can simulate the developments of various types of cavitation, including alternate blade cavitation, rotating cavitation, and cavitation surge. This result is based on the observation that the steady cavity length, as well as the developments ofvarious types ofcavitation, is fairly well predicted by the correlation.
Highlights
The effect of inclining the leading edge of a wing to the oncoming flow, called sweep, is familiar to us all from seeing modern high-speed aircraft
The occurrence of cavitation in liquids causes special problems for pumps and, in many cases, the inlet of a pump is fitted with a special rotor to operate satisfactorily with extensive cavitation and it is usually called an inducer pump This rotor may be an integral part of the main pump to follow or a separate device
We want to propose similar rules for inducer pumps based on the idea of a cascade of straight blades simulating the flow in the tip region of an inducer of radial blade elements with an axial inflow
Summary
The effect of inclining the leading edge of a wing to the oncoming flow, called sweep, is familiar to us all from seeing modern high-speed aircraft. They find that (from their conclusions) the lift drag ratio for highly swept foils is superior to the unswept case at the same and even lower cavitation number (all at constant angle of attack) and that the flow velocity normal to the foil should be selected to calculate a cavitation number With this background, we want to propose similar rules for inducer pumps based on the idea of a cascade of straight blades simulating the flow in the tip region of an inducer of radial blade elements with an axial inflow. The leading edges of these blades are shown in the meridional view inclined at angle 3 from what would be a radial line in Fig. Imagine we progress from P normal to the leading edge along blade
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