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1 Introduction Jet engines see wide use in many applications, aviation and energy production among many others. The design and construction of a jet engine requires a great deal of knowledge from many different fields. From thermodynamics and fluid mechanics to mechanical engineering. In order to build a modern jet engine, you need a lot of expe- rienced people from all these certain fields. A modern jet engine is truly a miracle of engineering. With everything from fine tolerance in space to resilience to high tempera- tures and stress. The jet engine has gone through a revolution over the years, with great improvements in performance, efficiency and reliability. The most commonly known jet engines are the turbojet engine, the turboprop engine, the turbofan engine, the turboshaft and the ramjet engine. The major principle in all these engines are the same. And they work according to similar concepts as the internal combustion engine: suck, squeeze, bang and blow. The first part is focused on the inlet, the air is sucked in: suck. The second part is focused on the compression of the air, where the inlet air is compressed to a higher pressure: squeeze. The third part is focused on the combustion chamber, where the compressed air is mixed with fuel and then ignited: bang. The fourth part is focused on the outlet of the engine, where the ignited air and fuel-mixture exits at a high velocity: blow. These concepts can be applied to all of the jet engines, with minor adjustments. [1] Starting out with a compressor, a combustion chamber and a turbine, we can tell the difference from the turbojet, turboprop, turboshaft and turbofan on where the power is transferred from the turbine. In a turbojet, the turbine is connected to the compressor. In a turboprop, the turbine is connected to the compressor and a propeller. In a tur- boshaft, the turbine is connected to the compressor and a power shaft. In a turbofan, the turbine is connected to the compressor and a fan that blows air through a duct around the engine. The engine chosen for this project is the simplest type, the turbojet engine. A different kind of jet engine are the ramjet and the scramjet. These engines have no moving parts and need to have an initial speed of several times the speed of sound before starting up. They work in a way where the incoming air, due to it’s relative speed is compressed by the inlet enough to sustain combustion when fuel is added. And the force of the air exiting the engine is propelling the aircraft forward, making the engine compress even more air, repeating the cycle. 3PDF Image | Design and construction of a simple turbojet engine
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