Device and method for aerodynamic efficiency of wind turbine array in wind tunnel experiment

Abstract

The invention discloses a device and method for aerodynamic efficiency of a wind turbine array for a wind tunnel experiment. The method comprises the following steps of (1) modeling the device by three-dimensional modeling software; (2) drawing up the shaft power output efficiency of a miniature direct-current motor in the rotating state of a generator; (3) constructing the device for the aerodynamic efficiency of the wind turbine array for the wind tunnel experiment; (4) checking the safety of the equipment; (5) acquiring a set wind speed; (6) collecting thrust and output current of a reference first wind turbine at different rotating speeds; (7) constructing the wind turbine array; 8) completing a pneumatic data curve of the first wind turbine in the wind turbine array; (9) completing pneumatic data curves of all the wind turbines in the wind turbine array; and (10) processing data. The device comprises a supporting bottom plate, a six-component balance arranged on the supporting bottom plate and a wind turbine fixed on the six-component balance. According to the device and the method, the power data and dynamic load change conditions of the wind turbines at different positions in the wind driven generator array under various wind speeds can be accurately acquired, and the aerodynamic characteristic curve of the wind turbines can be accurately fitted.

Description

technical field [0001] The invention relates to the field of wind tunnel test and aerodynamic characteristic test of wind turbine array, in particular to a device and method for aerodynamic efficiency of wind turbine array used in wind tunnel experiment. Background technique [0002] In recent years, the installed capacity of wind power has been continuously increasing, accounting for almost half of all power growth in the past five years. At present, my country's new installed capacity is nearly 30 million kilowatts. The operating flow conditions of wind turbines under various working conditions are characterized by long-term high turbulence. The actual wind turbine flow is generally high turbulence and the wake of the previous wind turbine rotation. In order to understand the distribution of this flow structure And dynamics are critical for the quantitative analysis of unsteady loads and power output fluctuations. [0003] In order to achieve this goal, a wind farm consis...

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Problems solved by technology

At present, there are still some problems to be solved. In the wind tunnel experiment, there is an inevitable difference between the Reynolds number and the real environment, and the model wind generator is generally made of a micro DC motor. The electromechanical conversion efficiency of this type of motor The performance is usually poor, so it is necessary to accurately test the performance of the small wind turbine before the wind tunnel experiment. The existing research generally uses the electric power of the motor that is relatively easy to obtain to characterize the performance of the wind turbine.

However, due to the mechanical and electrical losses of the generator, the value of the electrical power will obviously be less than the shaft power output by the wind rotor, and since the output electrical power is affected by the characteristics of the modeled generator, it will get wrong information about the wind performance, while some other The research uses the known DC generator equations to estimate, but this method requires too many motor characteristic parameters, and it is not clear whether this method can reliably estimate the mechanical power of the wind turbine

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