【作者】 李宁； 胡俊辉； 黄卫清； 朱春玲； 赵淳生；

【Author】 Ning LI,Jun-hui HU,Wei-qing HUANG,Chun-ling ZHU,Chun-sheng ZHAO Precision Driving Laboratory,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

【机构】 南京航空航天大学精密驱动研究所；

【摘要】 由于飞行条件(低空、高湿度)的原因,直升机主旋翼比其它固定翼飞行器更有结冰的危险。为满足直升机全天候飞行的要求,必须对桨叶采取防/除冰措施,现有的桨叶除冰方法很多,优缺点参差不齐,其中电热除冰是较为应用广泛的一种,但是其功率损耗性较大,近些年来,随着压电技术的发展,振动剪切力除冰因其理论低功率损耗,微纳米级振动不会改变翼型(较气动除冰)等诸多优点,越来越受到人们的关注。本文针对OA212翼型的直升机桨叶,采用压电陶瓷逆压电效应在桨叶前缘包层上的冰层中产生受迫振动,使冰与包层间剪切应力大于冰的黏附应力,从而达到防/除冰目的。在本研究工作中,首先应用ANSYS研究了压电陶瓷厚度长度对旋翼冰层交界面剪应力的影响,然后分析剪切应力与频率的关系。在上述工作的基础上,得到了单个压电陶瓷驱动条件机翼覆冰层表面应力分布情况。更多还原

【Abstract】 For the reason of flight conditions(altitude,high humidity),the helicopter is more susceptible to icing conditions than other fixed-wing aircraft.To meet the requirements of the helicopter flying in all weather, deicing measures must be taken for the blade.There are lots of existing blade deicing methods, electro-thermal is widely used,but the loss of power is very great.With the development of piezoelectric technology,shear vibration deicing is more and more concerned by people for their low power consumption, micro and nano-level vibration and many other advantages.In this paper,the OA212 airfoil helicopter blades are studied,and shear stress between blade and ice is generated by the forced vibration which is driven by piezoelectric ceramic.It achieves the deicing purpose when the shear stress at the interface between the blade and ice is greater than the adhesion stress.In this study,we first study the effect of shear stress for different thickness and length of piezoelectric ceramic,and then analyze the relationship between the shear stress and frequency.Based on the above work,we get the distribution of shear stress on the surface of blade which is driven by a single piezoelectric ceramic.更多还原