掌上透平弹性箔片动压气体轴承的试验研究  

Miniature Aerodynamic Elastic Foil Gas Bearing for Palm-Sized High Speed Turboexpander

作　　者：陈汝刚[1] 席光[1] 陈韬[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2014年第7期1-4,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51076129);中央高校基本科研业务费专项资金资助项目(SYSPZ2011030)

摘　　要：为了满足微小型高速透平稳定、可靠运转的要求,设计研制了一种以精密机加工制作为目的的微小型箔片气体轴承,提出了以弹性鼓泡支承的新型波箔结构,其中箔片元件由表面光滑的平箔和半球型鼓泡突起体的弹性底箔组成,鼓泡箔片可采用单层鼓泡或多层鼓泡,多层鼓泡的第一层鼓泡在第二层鼓泡的跨距中央。在一台主轴轴径为6mm的掌上高速透平上首次进行了振动特性及稳定性试验,结果表明:新型鼓泡箔片轴承具有良好的阻尼特性,对转子不稳定涡动的抑制能力较强;鼓泡自身变形具有调节刚度和阻尼的特点;在全动压条件下,试验透平稳定运转达到近36万r/min。To meet the operation requirement of miniature high speed turbo-machinery,a new type of compliant aerodynamic foil gas bearing manufactured by conventionally precise machining is developed,where the foil configuration is composed of smooth top foil and elastic bump foil with series of hemispherical convex dots.This kind of bump foil contains one layer or multilayer structure.For multilayer structure,the convex dots on the first layer are set on the middle of span of second layer convex dots.This foil bearing is firstly applied to a palm-sized high speed turboexpander with shaft diameter of 6 mm,and an experiment on a high speed gas bearing turboexpander test rig is conducted to examine the vibration characteristic and stability.It indicates that the proposed foil bearing is endowed with fine damping performance to restrain unstable whirling.The hemispherical convex dots on the foil are able to adjust foil stiffness and damping by the self-deformation.The maximum rotational speed of the tested palm-sized turboexpander reaches 360 000r/min.

关 键 词：高速透平 箔片轴承 弹性鼓泡支承 气体轴承 动压 

分 类 号：TH117[机械工程—机械设计及理论]