Feasibility investigation of a compressor rotor supported by gas foil bearings with inhomogeneous bump foils

Li, Hao; Geng, Haipeng; Wang, Bo; Zheng, Wei

doi:10.1177/13506501211004668

Cited by 7 publications

(7 citation statements)

References 22 publications

(27 reference statements)

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“…(2) the bump foil is equivalent to spring support, and the foil structural stiffness k b per unit area is calculated using Heshmat's formula, 20 see Eq. (6). Besides, the stiffness of the top foil is neglected.…”

Section: Expression Of Film Thickness Considering Foil Deformation An...mentioning

confidence: 99%

“…It is generally accepted that a better design of foil structure 3 might be the solution to this technical hurdle. Thus, GFBs supported by novel foil structures, such as three-pad structure, 4 bump-type shim foil, 5 inhomogeneous bump foil, 6 etc, were presented. Meanwhile, much literature was trying to take account of the nonlinear characteristics, such as kinetic dry friction, 7 etc.…”

Section: Introductionmentioning

confidence: 99%

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Performance of textured foil journal bearing considering the influence of relative texture depth

Zhang

Han

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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Both foil structure and surface texturing have been widely used to improve bearing performance. However, there is little research on their combination, namely, textured gas foil bearing. This paper adopts the Reynolds equation as the pressure governing equation of bump-type foil journal bearing to study the influence of textures located on the top foil. The Newton-Raphson iterative method and the perturbation method are employed to obtain static and dynamic characteristics, respectively. Thereafter, based on three texture distribution types, further analysis about the effect of the relative texture depth and the textured portion is carried out. The results indicate that an appropriate arrangement of textures could improve the performance of gas foil bearing. For #1 texture distribution, the maximum increment of load capacity could exceed 10% when ω = 1.4 × 105 r/min, ε = 0.2.

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Section: Expression Of Film Thickness Considering Foil Deformation An...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of textured foil journal bearing considering the influence of relative texture depth

Zhang

Han

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…In the design of the elastic unit, in addition to the conventional bump foil, the protuberant foil proposed by Lai (2018) and the mental mesh foil designed by Feng et al (2016) were also used in the turbo machine. Meanwhile, the system integration of foil bearings was more and more mature, such as a 90,000 rpm synchronous motor (Cheng et al, 2019) and a vehicle compressor (Li et al, 2021) with foil bearings are experimental tested.…”

Section: Introductionmentioning

confidence: 99%

“…In the previous exploration, Li et al (2021) has successfully applied the inhomogeneous foil bearing in a vehicle compressor. However, the bearing performance with rotor misalignment has not been systematically analyzed.…”

Section: Introductionmentioning

confidence: 99%

Thermo-elastohydrodynamic analysis of the inhomogeneous foil bearing with misalignment

Geng

Lin

2021

ILT

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Purpose The misalignment is generally inevitable in the process of machining and assembly of rotor systems with gas foil bearings, but the exploration on this phenomenon is relatively less. Therefore, the purpose of this paper is to carry out the thermo-elastohydrodynamic analysis of the foil bearing with misalignment, especially the inhomogeneous foil bearing. Design/methodology/approach The rotor is allowed to misalign in two non-rotating directions. Then the static and dynamic performance of the inhomogeneous foil bearing is studied. The thermal-elastohydrodynamic analysis is realized by combining the Reynolds equation, foil deformation equation and energy equation. The small perturbation method is used to calculate the dynamic coefficients, then the critical whirl ratio is obtained. Findings The gas pressure, film thickness and temperature distribution distort when the misalignment appears. The rotor misalignment can improve the loading capacity but rise the gas temperature at the same time. Furthermore, the rotor misalignment can affect the critical whirl ratio which demonstrates that it is necessary to analyze the misalignment before the rotordynamic design. Originality/value The value of this paper is the exploration of the thermo-elastohydrodynamic performance of the inhomogeneous foil bearing with misalignment, the analysis procedure and the corresponding results are valuable for the design of turbo system with gas foil bearings.

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“…Cheng et al 16 designed a 90,000 rpm permanent magnet synchronous motor based on the three-pad foil bearing. Li et al 17 proved that the foil bearing is unstable in large clearance through experiments, and designed a high-speed compressor based on this phenomenon. The application of foil bearings in rotating machinery, 18,19 especially in high temperature conditions, 20 has proved its potential in engineering.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental verification of the vehicle compressor rotor system with inhomogeneous foil bearings

Geng

2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this paper, the design and experimental verification of the rotor system with gas foil bearings are carried out with a vehicle compressor developed in our laboratory. The designed rotating speed 100,000 rpm with 50 g/s mass flow and 1.8 pressure ratio. The journal foil bearing with inhomogeneous bump foil is designed and tested by a push-pull device to evaluate the structure stiffness of bump foil. The result shows that the stiffness curves of two bearings with the same manufacturing process are not consistent, which indicates the uncertainly in the manufacture of foil bearings and it is necessary to obtain the foil stiffness data by experiment. A multi-disc model is established to simulate the impeller in the finite element model (FEM) for the vehicle compressor is too short to ignore the impeller width. The stiffness and damping coefficients of foil bearings are used to proceed rotordynamic analysis. The vibration experiments indicate that with the operating speed enhancement, the center orbit falls smaller. When the rotating speed increases to about 60,000 rpm, two sub-synchronous frequency occur and remain at 150 and 307 Hz finally. Two radial acceleration peaks appear at 9736 and 25,828 rpm respectively, which are close to the critical speed of damped Campbell diagram. The compressor performance map shows that the pressure ratio of the compressor is slightly lower than the design value due to the eccentricity of the foil bearing, which can be solved by increasing the operating speed. This paper provides some reference value for the design and experiment of vehicle compressor supported by the foil bearings.

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Feasibility investigation of a compressor rotor supported by gas foil bearings with inhomogeneous bump foils

Cited by 7 publications

References 22 publications

Performance of textured foil journal bearing considering the influence of relative texture depth

Performance of textured foil journal bearing considering the influence of relative texture depth

Thermo-elastohydrodynamic analysis of the inhomogeneous foil bearing with misalignment

Design and experimental verification of the vehicle compressor rotor system with inhomogeneous foil bearings

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