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



40 60 



Vs SHIP VELOCITY, KNOTS 



Fig. 9 - Variation of specific thrust with ship speed 



DISCUSSION 



The preceding two -phase nozzle analysis has established a basis for the 

 evaluation of the propulsion effectiveness of one class of air -water systems, 

 i.e., the water-augmented air-jet (Mist-Jet). It appears from this and many 

 previous studies that the derived equations are satisfactory for an initial under- 

 standing of the major properties needed to evaluate a propulsion device. Of 

 course, more detailed analyses and experiments are required to refine these 

 calculations with regard to: 



(i) water scoop inlet losses and cavitation behavior, 

 (ii) water injection nozzle size, droplet size and spray distribution. 



1071 



