NACA duct

The NACA duct or NACA scoop is a common form of low-drag intake design, orginally developed by the National Advisory Committee for Aeronautics in 1945. When properly implemented, it allows fluid to be drawn into an internal duct, often for cooling purposes, with a minimal disturbance to the flow. The design was originally called a "submerged inlet," since it consists of a shallow ramp with curved walls recessed into the exposed surface of a streamlined body, such as an airplane or race car.

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The design is believed to work because the combination of the gentle ramp angle and the curvature profile of the walls creates counter-rotating vortices which suck in the boundary layer while avoiding the form drag and flow separation that can occur with protruding inlet designs. However, this type of flush inlet generally cannot achieve the larger ram pressures and flow volumes of an external design, and so is rarely used for the jet engine intake application for which it was originally designed.

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Drag: :This page is about forces which tend to slow a moving object. For other uses, see Drag (disambiguation)....

Intake: :See also dietary intake and Intake, South Yorkshire....

National Advisory Committee for Aeronautics: The National Advisory Committee for Aeronautics (NACA) was a U.S. federal agency founded on March 3, 1915 to undertake, promote, and institutionalize aeronautical research. On October 1, 1958 the agency was dissolved, and its assets and personnel formed the core of the newly created National Aeronau...

NACA duct related Images and Photos (experimental)

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