The efficiency of a gas turbine cycle rises as the turbine entry temperature is increased. Because of this, the hotter the combustion gases that go in to the first turbine stage, the more particular power the jet engine can create. In a modern engine, about twenty percent of compressed air bleeds off for cooling and sealing purposes. This is mostly for guide vanes and turbine blades. The stators and the outer wall of a turbine’s flow passage utilize cooling air moving from the compressor between the combustor and casing of the outer engine.