Thermodynamics A text only version of this slide is available which gives all of the flow equations. The interactive Java applet EngineSim is also available. This program solves these equations and displays the thrust and fuel flow values for a variety of turbine engines. Most modern passenger and military aircraft are powered by gas turbine engines, which are also called jet engines. There are several different types of jet engines, but all jet engines have some parts in common.
All jet engines have a combustor or burner in which the air and fuel are mixed and burned.
The burning occurs at a higher pressure than free stream because of the action of the compressor. The pressure in the burner remains nearly constant during burning, decreasing by only 1 to 2 per cent. As opposed to the compressor and power turbine , we cannot simply relate the total temperature ratio in the burner to the total pressure ratio because the physical processes are different. In the compressor and turbine, no heat enters the domain. Under those conditions the pressure ratio and temperature ratio are related.