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A turbine blade is a radial aerofoil mounted in the rim of a turbine disc and which produces a tangential force which rotates a turbine rotor. [2] Each turbine disc has many blades. [3] As such they are used in gas turbine engines and steam turbines.
An airfoil (American English) or aerofoil (British English) is a streamlined body that is capable of generating significantly more lift than drag. [1] Wings, sails and propeller blades are examples of airfoils.
The NACA four-digit wing sections define the profile by: [2] First digit describing maximum camber as percentage of the chord.; Second digit describing the distance of maximum camber from the airfoil leading edge in tenths of the chord.
At the front of the DB-10 the thick aerofoil centre section stretched unbroken between the engines, which were mounted upon it. Beyond the engines outer wings of normal thickness and constant chord, significantly thinner and narrower than the inboard section, were each supported by a pair of parallel struts to the lower edge of the centre section.
Aerofoil nomenclature showing chord line Chord line of a turbine aerofoil section. Chords on a swept-wing. In aeronautics, the chord is an imaginary straight line segment joining the leading edge and trailing edge of an aerofoil cross section parallel to the direction of the airflow.
where P is the power, F is the force vector, and v is the velocity of the moving wind turbine part.. The force F is generated by the wind's interaction with the blade. The magnitude and distribution of this force is the primary focus of wind-turbine aerodynamics.
As the aerofoil moves around the back of the apparatus, the angle of attack changes to the opposite sign, but the generated force is still obliquely in the direction of rotation, because the wings are symmetrical and the rigging angle is zero. The rotor spins at a rate unrelated to the windspeed, and usually many times faster.
A foil is a solid object with a shape such that when placed in a moving fluid at a suitable angle of attack the lift (force generated perpendicular to the fluid flow) is substantially larger than the drag (force generated parallel to the fluid flow).