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diffuser
- Definição1
- A specially designed duct, chamber, or section, sometimes equipped with guide vanes, that decreases the velocity of a fluid, such as air, and increases its pressure, such as in a jet engine, a wind tunnel, etc. In a gas turbine engine, the diffuser converts the velocity energy of the air leaving the compressor into pressure energy before it passes into the combustion chamber. The diffuser may be formed as an integral part of the compression casing or be bolted to it. It consists of a number of tangential vanes, whose inner edges are parallel to the direction of the resultant airflow from the rotating compressor. The passages between the vanes are proportioned so that air pressure attains the requisite entry value on entry to the combustion chambers.
- Fonte1
- KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
- Fonte2
- FEDERAL AVIATION ADMINISTRATION. Helicopter flying handbook (FAA-H8083-21A). Washington, DC: FAA, 2012.
- Nota adicional1
- Information regarding this term is a result of researches developed by DECEA in cooperation with ANAC.
- Contexto
- A centrifugal compressor consists of an impeller, diffuser, and a manifold. The impeller, which is a forged disc with integral blades, rotates at a high speed to draw air in and expel it at an accelerated rate. The air then passes through the diffuser which slows the air down. When the velocity of the air is slowed, static pressure increases, resulting in compressed, high-pressure air. The high pressure air then passes through the compressor manifold where it is distributed to the combustion chamber.
- Subárea1
- Engine
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