What is the principle of operation for a jet engine?

The principle of operation for a jet engine is based on the Brayton cycle, which describes how gas turbines (including jet engines) convert fuel into energy through a continuous process. In the Brayton cycle, air is compressed, mixed with fuel, and burned in the combustion chamber. This high-pressure combustion gas then expands rapidly through the turbine and exhaust system, producing thrust as it exits the engine. The efficiency of this cycle hinges on the constant flow of air and fuel, allowing for a continuous operation that is ideal for propulsion in aircraft.

Understanding the Brayton cycle is crucial because it encompasses the key stages of compression, combustion, and expansion that define how jet engines function. This cycle highlights the importance of high-pressure air and the efficient conversion of chemical energy into mechanical energy, which is fundamental for jet propulsion.