摘要
基于有限差分法和Newton-Raphson迭代法求解止推轴承间隙的润滑气膜压力,根据气膜压力分布特征对常规型双层鼓泡箔片的鼓泡分布进行改进,并采用有限元法求解支承结构各层箔片的弹性变形和应力分布情况。结果表明,随着支承结构轴向均匀柔性系数的增大,气膜压力不断减小,平台区压力分布的均匀性不断增强。平箔片相比于鼓泡箔片具有较大的弹性变形和应力集中,使其更易磨损,第一层鼓泡箔片的弹性支承作用较第二层更显著。改进后的新型支承结构各层箔片的变形量和变形区域均远小于常规型,且在平台区变形均匀,可有效抑制箔片磨损,提高透平膨胀机止推轴承的承载力和稳定性。
Based on the finite difference method and Newton-Raphson iterative method,the lubrication gas film pressure in the thrust bearing clearance was solved.According to the charac-teristics of the film pressure distribution,the protuberant distribution of conventional double-layer protuberant foil was optimized.The elastic deformation and stress distribution of each layer of foil in the support structure were solved by finite element method.The results show that with the in-crease of the uniform flexibility coefficient of the supporting structure in the axial direction,the film pressure decreases,and the uniformity of the film pressure distribution in the platform area in-creases.Compared with the protuberant foil,the flat foil has larger elastic deformation and concen-trated stress,which makes it easier to wear.The elastic supporting effect of the first layer of protu-berant foil is more significant than that of the second layer.The deformation of foil and the area of deformation area in each layer of foil in the improved new support structure are far less than those of the conventional one,and the deformation of platform area is uniform,which can effectively reduce the foil wear and improve the capacity and stability of the thrust bearing in the turbo-expander.
作者
卢攀
强萌
Lu Pan;Qiang Meng(School of Energy and Architecture,Xi’an Aeronautical University,Xi’an 710077,Chin;School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《低温工程》
CAS
CSCD
北大核心
2021年第4期23-27,共5页
Cryogenics
基金
国家自然科学基金项目(51406157)资助项目。
关键词
鼓泡箔片
透平膨胀机
弹性变形
动压止推轴承
protuberant foil
turbo-expander
elastic deformation
aerodynamic thrust bearing
