PRINCIPLES OF NAVAL ENGINEERING 



,S, Li.»,..,.S» Y'' '""""I "'"I'L . „,.»,,.. 



TO GLAND EXHAUST 



Figure 12-20.— Turbine gland. 



47.19X 



EXHAUST 



SPACE "b' 



DUMMY 

 CYLINDER 



DUMMY 

 PISTON 



-^ SPACE A 



47. 5X 



Figure 12-21.— Dummy piston and cylinder arrangement. 



turbine delivers approximately equal power to a 

 reduction gear. 



2. Type II- A (straight-through unit).— The 

 Type II- A propulsion unit is a two element 

 straight-through unit, and consists of two ahead 

 elements, known as a high pressure (HP) ele- 

 ment and a low pressure (LP) element. The HP 



and LP elements are contained in a separate 

 casing and are commonly known as the HP and 

 LP turbines, respectively. The HP and LP tur- 

 bines deliver power to a single shaft through a 

 gear train and are coupled separately to the 

 reduction gear. Steam is admitted to the HP 

 turbine and flows straight through the turbine 



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