boundary-layer drag

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• boundary-layer drag — A drag associated with losses of total pressure and total temperature in the boundary layers. It is the sum of the boundary layer normal pressure drag and the surface friction …   Aviation dictionary

• boundary-layer normal-pressure drag — A drag resulting from the shape of the body. Streamlining the exposed parts can reduce boundary layer drag. See also form drag …   Aviation dictionary

• Boundary layer suction — is technique in which an air pump is used to extract the boundary layer at the wing or the inlet of an aircraft. Improving the air flow can reduce drag. Improvements in fuel efficiency have been estimated as high as 30%. The boundary layerThe air …   Wikipedia

• Boundary layer separation — is when the thin layer of viscous fluid leaves the surface of the body that it is flowing over. The viscosity of the fluid causes the boundary layer separation. [Wilcox, David C. Basic Fluid Mechanics. 3rd ed. Mill Valley: DCW Industries, Inc.,… …   Wikipedia

• Boundary layer — For the anatomical structure, see Boundary layer of uterus. Boundary layer visualization, showing transition from laminar to turbulent condition In physics and fluid mechanics, a boundary layer is that layer of fluid in the immediate vicinity of… …   Wikipedia

• boundary layer — Physics. the portion of a fluid flowing past a body that is in the immediate vicinity of the body and that has a reduced flow due to the forces of adhesion and viscosity. [1920 25] * * * In fluid mechanics, a thin layer of flowing gas or liquid… …   Universalium

• boundary layer — The layer of fluid, close to the surface of a body placed in a moving stream, in which the impact pressure is reduced as a result of the viscosity of the fluid. A velocity gradient exists through the boundary layer, ranging from the velocity of… …   Aviation dictionary

• Boundary layer control — In aeronautical engineering, boundary layer control (BLC) refers to a number of methods of controlling the boundary layer of air on the main wing of an aircraft. In doing so, parasitic drag can be greatly reduced and performance likewise… …   Wikipedia

• boundary-layer control — Methods used to control the boundary layer by sucking air through slots, making a series of small holes or porous surfaces, by blowing, or by using discrete jets. These methods can be employed to decrease drag or to increase lift on the whole or… …   Aviation dictionary

• Planetary boundary layer — Depiction of where the planetary boundary layer lies on a sunny day The planetary boundary layer (PBL), also known as the atmospheric boundary layer (ABL), is the lowest part of the atmosphere and its behavior is directly influenced by its… …   Wikipedia

• Drag (physics) — Shape and flow Form drag Skin friction 0% 100% 10% 90% …   Wikipedia