Quandt 



>l> 



■ U- 



10 20 



NOZZLE COORDINATE, X [FTl 



30 



Fig. 6 - Variation of pressure and velocity with distance 



Here, the total thrust is reduced directly by effective appendage drag and indi- 

 rectly by the lower v^ resulting from internal losses. For illustration, Fig. 8 

 shows predicted thrust per unit mass flow of air as a function of water-to-air 

 mass flow ratio for several nozzle pressure ratios. Alternatively, Fig. 9 shows 

 the variation of specific thrust with ship speed for several pressure and mass 

 augmentation ratios. Another important characteristic of two-phase jets is pre- 

 sented in Fig. 10, which shows thrust intensity (thrust per unit exit area) versus 

 nozzle pressure ratio for various augmentation ratios. Also shown on this plot 

 is overall propulsion efficiency defined as 



For the performance shown in Figs. 8-10, the following loss coefficients and 

 system constants have been assumed: 



K = 0.20 



:□ — = 0.15 



1068 



