Titlebook: General Momentum Theory for Horizontal Axis Wind Turbines; Jens N?rk?r S?rensen Book 2016 Springer International Publishing Switzerland 20

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Basic Definitions,The basic tool for understanding wind turbine aerodynamics is the momentum theory in which the flow is assumed to be steady, inviscid, incompressible and axisymmetric. The momentum theory basically consists of control volume integrals for conservation of mass, axial and angular momentum balances, and energy conservation.

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The Tip Correction,In this chapter, the tip correction is discussed in detail, and it is shown that the ‘traditional’ Prandtl/Glauert tip correction contains an inherent inconsistency in the vicinity of the tip when using tabulated airfoil data. In fact, the solution becomes singular if the lift coefficient is not directly proportional to the tip correction.

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https://doi.org/10.1007/978-1-349-86101-9lly and by comparison to additional CFD computations and some recent experiments. It is found that the model only attains a well-defined optimum for tip speed ratios larger than 0.93, but that other inherent features of the equations by themselves will limit the power performance at smaller tip speed ratios.

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,“Making the Lazy Nigger Work”,e manufacturers is based on the blade-element/momentum (BEM) theory by Glauert (Aerodynamic theory. Springer, Berlin, pp. 169–360, .. A basic assumption in the BEM theory is that the flow takes place in independent stream tubes and that the loading is determined from two-dimensional sectional airfoil characteristics.

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One-Dimensional Axial Momentum Theory,cally a one-dimensional approach on a differential form, are assessed. It is shown that an actuator disc with constant axial loading does not result in a constant axial velocity in the rotor plane. Hence, one-dimensional momentum theory is only valid for averaged quantities.

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Detailed Analysis of the Joukowsky Model,lly and by comparison to additional CFD computations and some recent experiments. It is found that the model only attains a well-defined optimum for tip speed ratios larger than 0.93, but that other inherent features of the equations by themselves will limit the power performance at smaller tip speed ratios.

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Blade-Element/Momentum Theory,e manufacturers is based on the blade-element/momentum (BEM) theory by Glauert (Aerodynamic theory. Springer, Berlin, pp. 169–360, .. A basic assumption in the BEM theory is that the flow takes place in independent stream tubes and that the loading is determined from two-dimensional sectional airfoil characteristics.

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978-3-319-36933-4Springer International Publishing Switzerland 2016