/2004JPK/HKHTGL/Chapter3/Chapter3-3-2.htm Gas turbine unit is a relatively new type of generator set. The simplest gas turbine device includes three main components: compressor, gas turbine and combustion chamber. The following figure is a schematic diagram of its process. Air and fuel are pressurized by compressor and pump respectively, and sent to combustion chamber, where fuel and air are mixed and burned, releasing heat energy. The temperature of the gas generated by combustion increases after absorbing heat, and then flows into the gas turbine to do work while expanding, and the gas after doing work is discharged into the atmosphere and released into the atmosphere. Repeat the above-mentioned processes of boosting pressure, absorbing heat, expanding and releasing heat, and continuously convert the chemical energy of fuel into heat energy and then into mechanical energy. Working principle diagram of jet engine The turbojet engine is used for jet propulsion, which avoids the inherent weakness of rocket and ramjet engine. Because of the turbine-driven compressor, the engine has enough pressure to generate strong thrust at low speed. The turbojet engine works according to the "duty cycle". It sucks air from the atmosphere, and after compression and heating, the air with energy and momentum is discharged from the propulsion nozzle at a speed as high as 2000 ft/s (6 10 m/s) or about 1400 mph (2253 km/h). When the high-speed jet flows out of the engine, it drives the compressor and turbine to continue to rotate at the same time, maintaining the "working cycle". The mechanical layout of turbine engine is relatively simple, because it only contains two main rotating parts, namely compressor and turbine, and one or several combustion chambers. However, not all aspects of this engine have this simplicity, because thermal and aerodynamic problems are more complicated. These problems are caused by the high working temperature of the combustion chamber and turbine, the changing airflow through the compressor and turbine blades, and the design of the exhaust system that exhausts the gas and forms a propulsion jet.