Propeller Blade Conspectives: The Basic Theory Of Blade Construction

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Blade Construction Blade construction had time to time improved in all aspects especially on design and manufacturing process. The varied demands of such a vast application range have given rise to an amazing number of mechanical variations in the design of all components, and especially in the construction details of the rotating blades.

Fortunately, when the discussion limited to the shape design factor, the variations in blade size, blade area ratio and the number of blades are manageable. Practically, most blades are produced using only four basic processes which are milling, grinding, roll forming and forging (George M Lucas, PhD, 2012).

2.1.1 Propeller Blade Geometry

Marine propellers comprise several parts -the propeller blades, …show more content…

Aerodynamics is the science and study of the physical laws of the behavior of objects in an air flow and the forces that are produced by air flows. The front and rear sides of a wind turbine rotor blade have a shape roughly similar to that of a long rectangle, with the edges bounded by the leading edge, the trailing edge, the blade tip and the blade root. The blade root is bolted to the hub. The radius of the blade is the distance from the rotor shaft to the outer edge of the blade tip. Some wind turbine blades have moveable blade tips as air brakes, and one can often see the distinct line separating the blade tip component from the blade itself. If a blade were sawn in half, one would see that the cross section has a streamlined asymmetrical shape, with the flattest side facing the oncoming air flow or wind. This shape is called the blade's aerodynamic profile. The shape of the aerodynamic profile is decisive for blade performance. Therefore a blade designer does not merely sit down and outline the shape when designing a new blade. The shape must be chosen with great care on the basis of past experience. For this reason blade profiles were previously chosen from a widely used catalogue of airfoil profiles developed in wind tunnel research by NACA (The United States National Advisory Committee for Aeronautics).

2.2 Blade

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