基于流体域仿真的高速风机气浮箔片轴承动静特性研究
Research on Dynamic and Static Characteristics of Air Floating Foil Bearing of High Speed Fan Based on Fluid Domain Simulation
张晨 1许亮 2孙丹 2李雨薇 2高飞 3荆建平1
作者信息
- 1. 上海交通大学机械系统与振动国家重点实验室,上海 200240
- 2. 中国船舶集团有限公司第七○三研究所,黑龙江哈尔滨 150078
- 3. 新乡航空工业(集团)有限公司,河南新乡 453000
- 折叠
摘要
气浮轴承特性对高速风机转子稳定性有显著影响,气浮轴承的静特性与动特性计算是准确获得转子系统失稳转速的基础.通过建立气浮轴承物理模型,以及对应的流体域模型,设定气浮轴承工作状况下的参数,模拟其在工作状况下的流体域分布情况,调整轴心位置,找到标准工作状况下的轴心位置,实现气浮轴承的静特性计算.在静特性计算的结果的基础上,赋予轴颈同频的扰动,模拟流体域分布情况,得到在给定扰动情况下轴颈的受力情况,根据力的变化求解得到气浮轴承对应的刚度系数与阻尼系数,实现气浮轴承动特性的计算.结果表明:随着转速的不断提升,稳定时的轴心位置会逐渐向气浮箔片轴承的圆心靠近;在一定的工作转速范围内,轴承的直接刚度系数随着转速的提升而下降,直接阻尼系数则在工作转速范围内下降到达低值后上升.分析气浮轴承的特性系数与转速之间的变化规律,可为开展转子系统动力学研究提供理论基础.
Abstract
The characteristics of air bearing have a significant impact on the stability of high-speed fan rotors,and the calculation of static and dynamic characteristics of air bearing is the basis for accurately obtaining the unstable speed of the rotor system.A physical model of air bearing and corresponding fluid domain model was established,by setting the parame-ters of air bearing under working conditions,the distribution of fluid domain of air bearing under working conditions was simulated.By adjusting the axis position,the axis position under standard working conditions was found,and the static char-acteristic calculation of air bearing was achieved.On the basis of the results of static characteristics calculation,the journal was subjected to disturbances of the same frequency,and the fluid domain distribution was simulated to obtain the force distribution of the journal under the given disturbance.The stiffness and damping coefficients corresponding to the air bear-ing were solved based on the changes in force,and the calculation of the dynamic characteristics of the air bearing was achieved.The results indicate that as the rotational speed continues to increase,the stable axis position will gradually ap-proach the center of the air floating foil bearing.With the increase of speed within a certain operating speed range,the di-rect stiffness coefficient of the bearing decreases,while the direct damping coefficient increases after reaching a low value within the operating speed range.This provides a theoretical basis for conducting research on rotor subsystem dynamics by analyzing the variation between the characteristic coefficient of the air bearing and the speed.
关键词
流体域仿真/气浮轴承/轴承特性计算/静特性/动特性Key words
fluid domain simulation/air bearing/bearing characteristic calculation/static characteristic/dynamic char-acteristic引用本文复制引用
基金项目
国家自然科学基金项目(1207219)
国家重大科技专项(779608000000200007)
出版年
2024
NETL
NSTL
万方数据