Double-impeller horizontal shaft wind turbine design optimization method

Abstract

The invention provides a double-impeller horizontal shaft wind turbine design optimization method. The method comprises the following steps: establishing a design optimization model of a DRWT; solvingthe design optimization model of the DRWT; predicting the aerodynamic performance of the DRWT in the process of solving the design optimization model of the DRWT by coupling AL theory and CFD. With the DRWT pitch angle combination, the interval between two stages of impellers, the size of the two stages of impellers and the rotation speed of the two stages of impellers as design variables, the method optimizes the design target with the maximum output power of the DRWT as the optimization design target, and the tower load as the constraint, the AL theory and CFD coupling numerical simulationmethod is proposed for the DRWT model to solve the detailed flow field between the two stage of impellers, so that it is convenient to optimize the design variables; and the method can forecast and evaluate the aerodynamic performance of a double-impeller wind turbine, and can improve the accuracy and velocity of the DRWT aerodynamic performance prediction substantially, thus improving the DRWT design efficiency and laying a foundation for the DRWT engineering design and engineering application.

Description

technical field [0001] The invention relates to a design optimization method, in particular to a design optimization method of a double impeller horizontal axis wind turbine, belonging to the technical field of wind turbines. Background technique [0002] The horizontal axis wind turbine (Horizontal Axis Wind Turbine, HAWT) can be divided into two types: lift type and drag type. For wind power generation, lift-type horizontal axis wind turbines are mostly used. Most horizontal axis wind turbines have a wind-facing device (also known as a yaw system), which can rotate with the change of the wind direction. When the direction of the wind speed vector changes, it can quickly and smoothly align with the wind direction so that the wind rotor can obtain the maximum wind energy; For large wind turbines, the transmission device composed of wind direction sensing elements and servo motors is used, which also constitutes a component of the wind turbine nacelle. [0003] Traditional ...

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Problems solved by technology

The model test research mainly studies the influence of two-stage impeller spacing, two-stage impeller speed matching, and two-stage impeller size on the overall output power of the wind turbine. However, the Reynolds number corresponding to the characteristic size of the wind tunnel test model is very different from the actual wind turbine. The reflected laws are not necessarily applicable to the prototype DRWT, and can only be used as a reference for the design of the prototype DRWT, and there is currently no design method for the prototype DRWT

Aerodynamic performance prediction is the key to wind turbine design. BEMT method (Blade Element Momentum Theory) is mainly used in engineering applications, and the calculation speed is fast, but the second-stage impeller of the actual DRWT cannot work when the first-stage impeller is fully developed. In the wake, BEMT cannot predict the aerodynamic performance of the second-stage impeller of this patent; while the traditional CFD method (Computational Fluid Dynamics, Computational Fluid Dynamics) has a large amount of calculation and low efficiency

In addition, since DRWT is a whole with two-stage impellers coupled to each other, traditional engineering methods cannot realize the engineering optimization design function for the overall coupled design

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