风电叶片电加热模具导热特性影响因素及优化研究

RESEARCH ON INFLUENCE FACTORS AND OPTIMIZATION OF THERMAL CONDUCTIVITY OF ELECTRIC HEATING MOLD OF WIND TURBINE BLADES

为使叶片电加热模具工作时的表面温度场分布更均匀,首先对叶片模具工作时的传热过程进行分析并确定初始条件;其次建立采用混合型电加热丝排布方式的叶片模具模型,将第一结构层厚度作为设计变量,对叶片模具进行结构优化,分别模拟不同模型工作时的温度场分布情况;最后制作优化后的叶片模具进行现场验证。结果表明,电加热叶片模具采用混合电加热丝排布方式,第一结构层厚度为8.5 mm时,表面最低温度较目前的电加热模具提高约1.13℃,表面层温差减小约47.2%,效果较明显,可为后续叶片新型模具的温度均布研究提供详实的试验数据。

To make the surface temperature field distribution more even during the electric heating mold working,firstly,the heat transfer process of the mold is analyzed and the initial conditions are determined;Secondly,a blade mold model with mixed electric heating wire arrangement was established.The thickness of the first structure layer was taken as the design variable to optimize the structure of the blade mold.The temperature field distribution of different models was simulated respectively.Finally,the optimized blade mold was made for field verification.The results shown that the electric heating blade mold adopts the method of mixed electric heating wire arrangement.When the thickness of the first structure layer is 8.5 mm,the minimum surface temperature increases by about1.13℃compared with the current electric heating mold,and the surface layer temperature difference decreases by about 47.2%.The effect is obvious,which provides detailed test data for the subsequent research on the uniform temperature distribution of the new type of blade mold.