ABSTRACT
Bas turbines are used in diversified services from jet engines and simple mechanical drives (on land, sea and air) to sophisticated gas lasers and supersonic wind tunnels. The turbojet is the simplest form of gas turbine in that the hot gases generated in the combustion process escape through an exhaust nozzle to produce thrust. The engines used in aircraft applications may be either turbojets, turbofans, or turboprops, but they are all commonly referred to as "jet engines." Mechanical drive gas turbines include the steam turbine derived heavy industrial gas turbines, aero-derivative gas turbines, and the hybrid industrial gas turbines. When the output drive shaft is an extension of the turbine component shaft it is referred to as a "hot end drive." In the cold end drive configuration the output shaft extends out the front of the compressor. Gas turbines are being used throughout the world for power generation in stationary, land based power plants.
