Gas-Turbine Powerplants For Two-Phase Hydropropulsion 



p mixture density (kg s^/m'*) ' ' -./•'"' . 



Pg gas density ■ '"''''' ' -• 



Pjj water density , ,, ,.' ' .! , 



a specific thrust [Eq. (25)] 

 <j^ the same, for truncated nozzle [Eq. (25')] 



(k+ l)/k , .^^^ , ^ • , ^ , 



(k - l)/k ..^■■..W-.-/^u- •• ^-^ : '^' - ^ ' ■ ■ 



- \ ' - \,-''-<J- ' ■■ ■ ■■ 



diffusion coefficient [Eq. (1)] 



When not otherwise specified, the subscripts ( )^, ( ); , ( )co, and ( )^, refer to 

 the corresponding stream cross sections [Figs. (5) and (6)], while ( )g, ( )j^ and 

 ( ) refer to gas, water, and two-phase mixture properties. 



REFERENCES 



1. Foa, J. v.: "Crypto- Steady Pressure Exchange" Rensselaer Polytechnic 

 Institute, TR AE 6202, March 1962 



2. Foa, J. v.: "A Method of Energy Exchange" ARS Journal, Sept. 1962 



3. Sarro, C.A., and Kosson, R.L.: "Theoretical Analysis of the Foa Propulsor 

 with Gas Primary and Liquid Secondary Fluids"; Grumman Aircraft Eng. 

 Corp., Rep. No. ADR 01-09-64-1, Aug. 1964 



4. Hoenemser, K.H.: "Flow Induction by Rotary Jets" J. Aircraft, Vol. 3 No. 1, 

 Jan. 1966 



5. Poole, D.M.: "Water- Augmented Turbofan for the Propulsion of High-Speed 

 Surface Vessels" United Aircraft Research Laboratories, Rep. UAR-E116, 

 June 1966 



6. Davison, W.R., and Sadowski, T.J.: "Water -Augmented Turbofan Engine" 

 J. Hydronautics, Vol. 2 No. 1, Jan. 1968 



7. Mottard, E.J., and Shoemaker, C.J.: "Preliminary Investigation of an 

 Underwater Ramjet Powered by Compressed Air" NASA-TN D-991, Dec. 

 1961 



8. Pierson, J.D.: "An Application of Hydropneumatic Propulsion to Hydrofoil 

 Craft", J. Aircraft, Vol. 2, No. 3, May-June 1965 



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