The initiation is of a thermal nature and is due to the adiabatic compression and heating of the trapped bubbles. A simple method of including a gas space in an explosive is to spread it as a ...

is at constant volume as is the exhaust heat loss (5,6). The compression (2,3) and work (4,5) strokes are both adiabatic. From, Reynolds & Perkins, McGraw Hill (1977) In the "real" cycle, inlet and ...