PRINCIPLES OF NAVAL ENGINEERING 



75.4 



Figure 22-4.— Volume, temperature, and pressure relationships in a cylinder. 



the principal differences existing between the 

 cycles. The diagrams shown are theoretical 

 pressure-volume diagrams. Diagrams repre- 

 senting conditions in operating engines are 

 given later. Information obtained from actual 



indicator diagrams may be used in checking 

 engine performance. 



OTTO (CONSTANT-VOLUME) CYCLE.-In 

 theory, this combustion cycle is one in which 



550 



