Air-Water Jet (Mist-Jet) for Ship Propulsion 



EXHAUST 



WATER SCOOP INLET 



Fig. 1 - Schematic drawing of Mist- Jet installation 

 in high-speed ship . 



mixture is allowed to expand to the atmosphere. At the mixing zone the air ve- 

 locity, pressure, and quantity may be varied to give a range of mixture veloci- 

 ties at the nozzle exit and consequently to make a larger or smaller unit. 



In order to compute the gas and liquid velocities at the nozzle exit from the 

 inlet conditions and nozzle shape it is necessary to couple the mass, momentum, 

 and energy conservation equations for each phase. To accomplish this analysis 

 the one -dimensional gas -liquid dynamic equations will be written for a differen- 

 tial length control volume as shown in Fig. 2. It will be assumed that the gas 

 properties are transversely uniform and that this phase obeys the ideal gas 

 equation of state. 



Fig. 2 - Control vol- 

 ume for two -phase 

 nozzle analysis 



-»P«dP A+dA 



Conservation Equations 

 Mass Conservation: 



Gas W^ = p^ v^ A^ 



Liquid W^ = ^p v^ A^ 



= Constant 

 = Constant 



Total w^ = w + w 



1061 



