Abstract
Gas foil bearing has been widely used in high-speed turbo machinery due to its oil-free, wide temperature range, low cost, high adaptability, high stability and environmental friendliness. In this paper, state-of-the-art investigations of gas foil bearings are reviewed, mainly on the development of the high-speed turbo machinery in China. After decades of development, progress has been achieved in the field of gas foil bearing in China. Small-scale applications of gas foil bearing have been realized in a variety of high-speed turbo machinery. The prospects and markets of high-speed turbo machinery are very broad. Various high-speed turbomachines with gas foil bearings have been developed. Due to the different application occasions, higher reliability requirements are imposed on the foil bearing technology. Therefore, its design principle, theory, and manufacturing technology should be adaptive to new application occasions before mass production. Thus, there are still a number of inherent challenges that must be addressed, for example, thermal management, rotor-dynamic stability and wear-resistant coatings.
Highlights
Gas foil bearing has the distinct advantages of cleanliness, low friction, low temperature rise, and cost effectiveness [1]
In view of above advantages, centrifugal blowers supported by gas foil bearings have become the first choice for energy-efficient blower
During the operation of the high-speed turbo machinery supported by gas foil bearings, high temperature failure caused by the accumulation of heat and the transient load in the complex environment will cause a sudden stuck of the rotor-bearing system
Summary
Gas foil bearing has the distinct advantages of cleanliness, low friction, low temperature rise, and cost effectiveness [1]. In the wire supporting foil bearing, a certain number of copper wires are fixed on the back of the foil, as shown in Figure 2c [11]. A series of theoretical and experimental research experiments on gas foil bearings has been conducted at Xi’an Jiaotong University [31], Hunan University [32,33], the Harbin Institute of Technology [34], Nanjing University of Aeronautics and Astronautics [35,36,37], the GREE company, and other institutions [38]. The progress of domestic gas foil bearings and their applications in high-speed turbo machinery are reviewed, which could provide a reference and guidance for further developments and applications of gas foil bearings
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