Ideally the process would be vertical on a TS diagram.
However, in the real process, friction and turbulence cause the pressure drop to be greater than ideal.
When air is taken from the compressor and used to cool the turbine it has an adverse effect on the amount of fuel required to give the required thrust. The effect of fundamental design changes to the engine, such as increased pressure ratio and turbine inlet temperature, is covered in "Cycle improvements'.
Ways to increase the pressure ratio are also covered.
The thrust and fuel consumption elements, and their variation with altitude, are of vital importance in the climb and cruise phases of operation of the aircraft.
The behaviour of a jet engine and its effect both on the aircraft and the environment is categorised into different engineering areas or disciplines.In fixed-wing aircraft driven by one or more jet engines, certain aspects of performance such as thrust relate directly to the safe operation of the aircraft whereas other aspects of the engine operation such as noise and engine emissions affect the environment.The thrust, noise and emission elements of the operation of a jet engine are of vital importance in the takeoff phase of operation of the aircraft.In theory, any combination of flight condition/throttle setting can be nominated as the engine performance Design Point.Usually, however, the Design Point corresponds to the highest corrected flow at inlet to the compression system (e.g. The design point net thrust of any jet engine can be estimated by working through the engine cycle, step by step.as outlined below to develop the required understanding to match the components efficiently.The flow through the compressor is the same as that through the turbine. The power produced by the turbine equals that absorbed by the compressor.For example, the emissions come under a group called combustion, the origin of vibrations transmitted to the airframe come under an area called rotor dynamics. The understanding of how a particular fuel flow produces a definite amount of thrust at a particular point in the flight envelope is called jet engine performance.Performance is the subject of a specialised discipline within aero engine design and development teams as is the understanding of noise and emissions by their respective specialists in other groups.The fundamental performance task for a single shaft turbojet is to match the operation of the compressor, turbine and propelling nozzle.For example, the way the compressor operates is determined by the flow resistances behind it, which occur in the combustor, turbine, tailpipe and propelling nozzle.