Intake Information
An intake, or especially for aircraft inlet, is an air intake for an engine. Because the modern internal combustion engine is in essence a powerful air pump, like the exhaust system on an engine, the intake must be carefully engineered and tuned to provide the greatest efficiency and power. An ideal intake system should increase the velocity of the air until it travels into the combustion chamber, while minimizing turbulence and restriction of flow.
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Automobile Engine Intakes
Early automobile intake systems were simple air inlets connected directly to carburetors. The first air filter was implemented on the 1915 Packard Twin Six.
Porsche in the 1980s designed an intake system for their cars that changed the length of the intake system by alternating between a longer and shorter set of tubing using a butterfly valve, creating a small amount of positive pressure which increased overall performance of the engine. Audi began to use a similar system in some cars in the 1990s. Alfa Romeo used variable-length intakes in their 2.0 Twin Spark engines powering the model 156.
Aircraft intakes
Main article: Components_of_jet_engines#Air_intakesWith the development of jet engines and the subsequent ability of aircraft to travel at supersonic speeds, it was necessary to design inlets for optimal air flow at any speed, which allowed the compressor stage to operate at its optimum flow speed of just-subsonic, regardless of the velocity of the ambient air at the mouth of the intake. These designs are highly complex due to the requirement to manage flow and shock front formation through the subsonic, transonic, and supersonic flight regimes.
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