A spar cap connection method for lengthening wind turbine blades

Abstract

The invention relates to the method of beam cap connection for lengthening wind turbine generator blades. The method is particularly adopted for connecting beam caps of the blades in the lengthening and improving process of existing wind turbine generator blades. Each reinforced beam cap is manufactured in a beam cap reserved zone between one existing beam cap of one blade and the corresponding beam cap of one blade tip lengthening section, so that the problem of connection of every two existing beam caps is solved. The blades which are lengthened and improved through the method for connecting the beam caps of the wind turbine generator blades are safe and reliable in structure.

Description

technical field [0001] The invention relates to a manufacturing technology of wind power generator blades, in particular to a spar cap connection method for lengthening existing wind power generator blades. Background technique [0002] At least some known wind power generators are composed of wind rotor blades, drive shafts, generators, towers and related control systems. The wind rotor blades have specific aerodynamic airfoils, which form rotation at a certain speed after absorbing wind energy energy, and then the rotational energy is converted into electrical energy by a generator. [0003] The selection of wind turbines is crucial to the development of a wind farm project, and it is directly related to the economic benefits of the wind farm project. As a general principle, for unit selection, try to select units whose design level is equal to that of the wind farm. Of course, units with a higher design level can be used in lower-level wind farms. From a technical point...

AI Technical Summary

Problems solved by technology

However, for the blade lengthened and transformed by this method, the existing blade spar cap and the blade tip extension spar cap are all UD glass fiber laminates, the thickness and width of the laminate have not changed, and the two spar caps are only bonded by structural adhesives. , there are two problems in this modified structure: First, the two sections of beam caps are bonded by structural glue, which means that the stress transfer between the two sections of beam caps UD glass fibers is completed through structural glue, resulting in discontinuous structure , and under the influence of negative factors such as uneven thickness of structural glue or local lack of glue, local bubbles, etc., it is easy to cause stress concentration at the bonding interface, and it is easy to cause fatigue damage under the action of alternating loads, and eventually cause the blade spar cap Second, the distribution of the stiffness of the blade itself is the same as that of the existing blade without modification. When the length of the blade increases, the deformation of the lengthened blade will increase, which reduces the clearance value between the blade and the tower, and increases the blade's impact on the tower. risk

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