Discussion: "On Flow Past a Supercavitating Cascade of Cambered Blades" (Hsu, C. C., 1972, ASME J. Basic Eng., 94, pp. 163–168)
Journal of Basic Engineering
The effect of cavity length on cascade performances is also of practical interest. Some of the theoretical calculations are depicted in Figs. 6 and 7. It is found in general, that the lift coefficient and cavitation number decrease with increasing cavity length and approach rather rapidly to certain asymptotic values. Also shown in Figs. 6(a) and 7(a) are experimental data of Wade and Acosta  for supercavitating flat plate cascades. The theoretical predictions are in reasonably good
... onably good agreement with experimental findings. Concluding Remarks In the present study a linearized theory of supercavitating flow past a straight cascade with arbitrary blade shapes is developed. From the analysis, it is possible to determine the lift and drag coefficients, cavitation number, cavity shape, and exit flow conditions for any given specific cascade geometry, blade shape, cavity length, and initial inflow conditions. The cavitating performance of the cascade is, in general, found to depend strongly on stagger angle, solidity, blade shape, and cavity length. It is needless to say that the present analysis is limited to cases in which the disturbance, caused by the presence of the blade, is small-an inherent restriction in the linear approximation. However, in practice the pump, turbine or propeller blades are quite thin and the linearized results obtained serve as a guide to the designer and aid in the interpretation of test results obtained for supercavitating pumps and turbines.