THE BLADELESS PROPELLER 



Joseph V. Foa 

 Rensselaer Polytechnic Institute 

 Troy, New York 



ABSTRACT 



The mechanism of cryptosteady pressure exchange is discussed, with 

 particular attention to its applications to propulsion. The available 

 theoretical and experimental information is briefly reviewed, and per- 

 tinent problem areas are identified. 



NOMENCLATURE 



Symbols 



A Cross -sectional area 



c Flow velocity in "relative" frame of reference 



h,h° Static, stagnation specific enthalpy ,..,,,.., 



H Total head ; , ^ ■ -^r; .• , ' ■ , > 



m Mass flow rate 



ppO Static, stagnation pressure ., -;_,:?.•• 



r Radial distance from axis of rotation 



s Specific entropy 



t Time 



jjro Static, stagnation temperature 



u Flow velocity in a space-fixed frame of reference 



y Transverse or peripheral velocity of primary discharge 

 orifice 



^ Azimuthal flow angle 



/3, . Spin angle 



1351 



