Experimental study on gas lubricated hydrodynamic bump type foil bearing

被引：1

作者：

Ma, Bin ^{[1
]}

Sun, Wan ^{[1
]}

Lai, Tianwei ^{[1
]}

Zheng, Yueqing ^{[1
,2
]}

Chen, Shuangtao ^{[1
]}

Hou, Yu ^{[1
]}

机构：

[1] School of Energy and Power Engineering, Xi'an Jiaotong University

[2] Institute of Mechanical Manufacturing Technology, China Academy of Engineering Physics, Mianyang

来源：

Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2014年 / 48卷 / 01期

关键词：

Experimental study; Foil; Gas bearing; Turboexpander;

D O I：

10.7652/xjtuxb201401020

中图分类号：

学科分类号：

摘要：

A bump type gas foil bearing was designed to meet the requirements of reliability and stability of high speed turbomachinery employed in engineering and an experimental investigation into the bump type gas foil bearing was carried out on a gas bearing high speed turbo-expander rotor test rig. The bump type gas foil bearing mainly consists of compliant top plate foil and bottom bump foil layers. In the experiment, the turbo-expander rotor was driven by compressed air with the pressure of 0.1-1.15 MPa and a volume flow rate of up to 600 m3/h (under standard conditions) from a 75 kW Atlas scroll compressor. Two bump type gas foil bearings having the foil 0.05 mm and 0.07 mm in thickness were applied in an industrial 150 m3/h (under standard conditions) oxygen high speed turbo-expander in which the diameter of the rotor is 25 mm. The vibration characteristics and the stability were examined. The results show that stiffness was one of the most important factors in bearing performance. The good stiffness characteristic of the 0.05 mm foil promoted effectively the vibration performance of the bearing, and the maximum rotational speed reached 93 366 r/min. In comparison, the larger stiffness of 0.07 mm foil caused the instable rotation of the rotor at 93 161 r/min. When the maximum rotating speed of the turboexpander rotor was 93 000 r/min, the present bump type gas foil bearing had good stiffness and damping performance. In addition, the maximum vibration amplitudes were smaller than 20 μm, thus effectively inhibiting the rotor whir in the high speed turbo-expander.

引用

页码：118 / 122

页数：4

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