涡轮缘板阻尼块摩擦接触特性研究

摘要

为了研究航空发动机涡轮缘板阻尼块的摩擦接触特性,减小涡轮叶片的振动,采用带圆角的平板接触理论模型进行数值模拟,推导接触面正压力及切向力的分布,研究接触模型的几何参数对迟滞曲线、切向刚度和能量耗散的影响规律.结果表明:接触面率为0时,存在最大能耗曲线和最大能耗点,并且随着接触面率的增大,迟滞曲线所围面积逐渐变小,每周期能量耗散逐渐减小;其他参数不变时,接触刚度随法向力的增大呈非线性增大.%In order to investigate the frictional contact characteristics of aeroengine turbine edge plate damping blocks and reduce the vibration of turbine blades, the numerical simulation was carried out by using the theoretical model of the plate contact with flat. The distribution law of the positive pressure and the tangential force on the contact surface was deduced. The influence of the geometrical parameters of the contact model on the hysteresis curve, the tangential stiffness and the energy dissipation were investigated. The results show that there exist a maximum energy consumption curve and a maximum energy consumption point when the contact rate is zero,and the area of the hysteresis curve and the energy dissipation decrease gradually with the increase of the contact rate.When the other parameters are constant,the contact stiffness increases nonlinearly with the increase of the normal force.