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(Block 10) 



Program Element 62543N 



Task Area ZF43421001 



Work Units 1500-103 and 1542-817 



(Block 20 continued) 



obtained by solving related integral equations. Numerical solution 

 of the integral equations is obtained as a correctional function for 

 a stripwise supercavitating cascade theory which, with lifting-line 

 theory, is used for preliminary design of supercavitating propellers. 

 The induced axial, radial, and tangential velocities are obtained on 

 a blade reference surface that allows arbitrary skew, rake, and 

 radial pitch variations. The blade shape is obtained as a correction 

 to the shape obtained from stripwise supercavitating cascade theory. 

 Thrust and torque coefficients are obtained from pressures on the 

 blade surface. 



The method is applied in designing several supercavitating pro- 

 pellers that have design conditions the same as those of existing 

 supercavitating propellers. 



Numerical computations were also used to design two additional 

 supercavitating propellers which were built and tested. The design 

 predictions are compared to the experimental data, both for blade 

 cavity height and performance characteristics, and good correlation 

 is obtained. 



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