How a continuous stream of hot gas propels massive aircraft through the sky
In short: To lift a plane weighing over half a million pounds, engineers rely on the relentless power of gas turbines. By sucking in air, compressing it, and igniting it with fuel, these engines create a high-velocity blast that pushes an aircraft forward through pure, concentrated energy.
At its core, a jet engine operates on the Brayton cycle, a continuous flow process where air is ingested through an inlet. The process begins with a compressor, consisting of many blades attached to a shaft. These blades spin at high speeds to squeeze the air, typically increasing its pressure to 10 to 40 times the pressure of the original inlet airstream. This compression is vital for the efficiency of the internal combustion occurring within the engine.
Once compressed, the air enters a combustion chamber. In this chamber, hydrocarbon fuel enters as liquid droplets, vapour, or a mixture, burning at nearly fixed pressure. Such combustion heats the air from 980–1,540 °C up to 3,000 °C in certain designs. This intense heat creates a high-pressure, high-temperature airstream that flows through a turbine.
The turbine is linked to the compressor by a torque shaft; as the expanding gases pass through the turbine blades, they extract energy to keep the compressor spinning. The remaining energy in the gas stream—often referred to as gas horsepower—is then discharged rearward through a nozzle. Following Newton's principle that every action has an equal and opposite reaction, this rearward discharge of hot exhaust gases generates the thrust required to propel the aircraft forward.
Modern designs, such as turbofans, often split the incoming air into two paths: a hot stream through the core and a cooler stream that flows around it. These streams eventually mix at the engine exit. While the process is incredibly powerful, it is not perfectly efficient; if it were 100 percent efficient, the fuel's heat release of approximately 43,370 kilojoules per kilogram would produce 12 kilowatts of power for every kilogram of fuel per hour.
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Sources
- Summary by Intellect · source: Jet Engine - Explained
- Also: Jet engine | Design, Types, & Functionality | Britannica
- Also: Engines
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