摘要:
以缩比后的翼型前缘曲面为研究对象,对压电振动除冰的方法进行了理论和实验研究。针对翼型曲面的特殊性,以有限元模型导出的翼型截面离散点为基础,设计了针对翼型曲面和不同压电元件尺寸下的压电元件可贴区域的求解算法,并通过五点共圆法和四点共圆法的理论思想得出翼型曲面各点切法向矢量的求解算法。针对翼型曲面研究了压电元件的布局规律。结果表明,翼型曲面结构下,压电元件的激励效果随着间距的增大而减弱,压电元件布置在振型波峰位置附近有最佳的激励效果。在粘贴接触面积一定的前提下,激励效果随着相对贴片数量的增加而减弱,而压电元件的贴片集中度越高,激励效果越好。实验得到了较好的除冰效果,验证了布局方式的可行性,同时除冰功率最大为69.77W·m-2,低于电热除冰系统所需功耗。
关键词:
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翼型曲面 /
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压电 /
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振动 /
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除冰 /
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布局方式
Abstract:
This paper presents the theoretical and experimental research on a de-icing method with the piezoelectric transducer as the actuator.The work is conducted on an airfoil surface.Based on the planar point data of the airfoil finite element model,a method for calculating the suitable area on which the piezoelectric actuators can paste is presented,and an algorithm for calculating the normal vec-tors and tangent vectors of a point on the airfoil surface using a combination of five-point formula and four-point formula is designed.The placement of piezoelectric actuators is studied.The re-sults show that on the airfoil surface,the excitation of the piezoelectric actuators decreases with the increase of the distance between two actuators,and the maximum excitation takes place when the actuators are placed near the position of the vibration wave crest.Under the premise of the constant paste contact area,the excitation of the actuators is weakened with the increase of the relative actuator number.Meanwhile,the higher the concentration of the piezoelectric actuator is,the better the excitation is.The de-icing experiments got good results,and the power con-sumption was about 69.77W·m-2 ,which is lower than that of electro-thermal de-icing method.
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