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A jet mill consists of a short cylinder, meaning the cylinder's height is less than its diameter. Compressed gas is forced into the mill through nozzles tangent to the cylinder wall, creating a vortex. The gas leaves the mill through a tube along the axis of the cylinder. Solid particles in the mill are subject to two competing forces:
The propelling nozzle converts a gas turbine or gas generator into a jet engine. Power available in the gas turbine exhaust is converted into a high speed propelling jet by the nozzle. The power is defined by typical gauge pressure and temperature values for a turbojet of 20 psi (140 kPa) and 1,000 °F (538 °C). [18]
English: Diagram of a typical gas turbine jet engine (in English). Air is compressed by the fan blades as it enters the engine, and it is mixed and burned with fuel in the combustion section. Air is compressed by the fan blades as it enters the engine, and it is mixed and burned with fuel in the combustion section.
While not strictly jet engines in that they rely on an auxiliary mechanism to produce thrust, turboprops are very similar to other turbine-based jet engines, and are often described as such. In turboprop engines, a portion of the engine's thrust is produced by spinning a propeller , rather than relying solely on high-speed jet exhaust.
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Schematic diagram showing the operation of a centrifugal flow turbojet engine. The compressor is driven by the turbine stage and throws the air outwards, requiring it to be redirected parallel to the axis of thrust. Schematic diagram showing the operation of an axial flow turbojet engine.