text: The combustion products are delivered to the 
  turbine section where sufficient work must be 
  extracted to power the compressor section. 
  The combustion chamber discharges high tem- 
  perature, high pressure gas to the turbine where 
  a partial expansion is accomplished with a drop 
  in pressure and increase in volume to point F 
  on the pressure-volume diagram. The work 
  extracted from the unit weight of air by the 
  the area 
  turbine section is represented by 
  ZEFY. As with 
  the compressor, the actual 
  shaft work extracted by the turbine will differ 
  from 
  indicated by the pressure-volume 
  losses incurred 
  diagram because of certain 
  through the turbine section. For steady, sta- 
  bilized operation of the turbojet engine the 
  power extracted by the turbine will equal the 
  power required to operate the compressor. If 
  the 
  turbine power exceeds the compressor 
  power required, the engine will accelerate; if 
  the turbine power is less than the compressor 
  power required, the engine will decelerate. 
  
  that 
  
  107 