Experimental Investigations of Novel Compound Bearing of Superconducting Magnetic Field and Hydrodynamic Fluid Field

Xu, Jimin; Zhang, Cuiping; Wang, Jianlei; Wang, Wei

doi:10.1109/tasc.2019.2934443

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…However, they all have remarkable advantages under certain working conditions. Therefore, our team proposed a novel superconducting compound bearing to combine the advantages of SMBs and fluid-film bearings [58][59][60][61]. Figure 13 displays the structural diagram of axial-type and radial-type superconducting compound bearings.…”

Section: Superconducting Compound Bearings Proposed By Our Teammentioning

confidence: 99%

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An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

Miao

et al. 2020

Chin. J. Mech. Eng.

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There is a consensus in the aerospace field that the development of reusable liquid rockets can effectively reduce the launch expense. The pursuit of a long service life and reutilization highly depends on the bearing components. However, the rolling element bearings (REBs) used in the existing rocket turbopumps present obvious and increasing limitations due to their mechanical contacting mode. For REBs, high rotational speed and long service life are two performance indexes that mutually restrict each other. To go beyond the DN value (the product of the bearing bore and rotational speed) limit of REBs, the major space powers have conducted substantial explorations on the use of new types of bearings to replace the REB. This review discusses, first, the crucial role of bearings in rocket turbopumps and the related structural improvements of REBs. Then, with the prospect of application to the next generation of reusable liquid rocket turbopumps, the bearing candidates investigated by major space powers are summarized comprehensively. These promising alternatives to REBs include fluid-film, foil, and magnetic bearings, together with the novel superconducting compound bearings recently proposed by our team. Our more than ten years of relevant research on fluid-film and magnetic bearings are also introduced. This review is meaningful for the development of long-life and highly reliable bearings to be used in future reusable rocket turbopumps.

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Section: Superconducting Compound Bearings Proposed By Our Teammentioning

confidence: 99%

“…Superconducting magnetic force of an axial-type SMB[58] Vibration amplitude of the superconducting compound bearing[59] …”

mentioning

confidence: 99%

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

Miao

et al. 2020

Chin. J. Mech. Eng.

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“…However, due to the longduration complicated maintenance of the liquid rocket turbopumps, the actual cost of space shuttle per launch is as high as 500 million dollars [4]. Till now, all the launched liquid-propellant rocket turbopumps have utilized rolling element bearings to support their high-speed shaft systems, which transmit external loads by point or line contacting form [5,6]. Due to the limitation of wear resistance, it is challenging to realize a long service life for the rolling bearings under high rotational speed.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Evaluation on Lubrication Performance of Thrust-Type Foil Bearings in Liquid Nitrogen

Dou,

Jiang,

et al. 2024

Preprint

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The development requirements for reusable liquid rocket engines have set higher standards for the reliability design of turbopump structures. To address the issue of bearing failure in turbopumps under harsh conditions such as low temperature, high speed, heavy load, and repeated start-stop cycles, this paper proposes replacing ball bearings with thrust foil bearings. We used liquid nitrogen instead of liquid hydrogen and liquid oxygen to simulate the ultralow temperature and low viscosity operating environment of turbopumps, evaluating the potential feasibility of using thrust foil bearings in this context. The numerical calculations primarily include the formulation of the foil deformation equations based on the link-spring model for the wavy foil and the thin plate finite element model for the top foil. These equations are solved by coupling the Reynolds lubrication equation, the fluid film thickness equation, and the foil deformation equations using the finite difference method, Newton-Raphson method, and finite element method. A detailed analysis is conducted on the effects of rotational speed, fluid film thickness, thrust disk inclination angle, and wavy foil interface friction coefficient on the static and dynamic characteristics of thrust foil bearings. The research findings provide guidance for the application of thrust foil bearings in liquid rocket turbopumps.

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“…However, further extension of superconducting technologies is hindered by the complicity and cost of the refrigeration unit used for cooling the SCs. Actually, these obstacles can be overcome to some extent when the superconducting technologies are applied in CLPs [9,10]. The cryogenic fluid medium of CLPs can provide an inherent cooling environment for SCs, so as to eliminate the use of dedicated refrigeration systems.…”

Section: Introductionmentioning

confidence: 99%

Analysis and testing of a superconducting maglev submersible cryogenic liquid pump

Zhang

et al. 2022

IET Electric Power Appl

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This paper studies a superconducting maglev submersible cryogenic liquid pump (CLP) using superconducting magnetic bearing (SMB). A new structure is proposed for the self‐stability of high‐temperature superconducting magnetic levitation, and the compact structure of disk motor‐pump. The rotor of the axial‐flux disk motor is connected with a centrifugal impeller to form an impeller‐rotor of the proposed superconducting CLP. Supported by a SMB system, the impeller‐rotor rotates frictionlessly with self‐stabilisation as a suspension rotor. The SMB system includes a radial‐type SMB, an auxiliary permanent magnet bearing, and an electromagnetic bearing composed of the stator and the rotor of disk motor. Theoretical calculations and experimental measurements are performed to examine the axial and radial levitation force behaviours of the SMB system. Then, a kinetic model of the suspension rotor is established and analysed to assure force balance and stable levitation. Finally, a prototype pump is fabricated and an experimental setup for liquid nitrogen transmission is constructed for validation purposes. The experimental tests on the pump head and the flow rate are carried out, which demonstrate the effectiveness of the proposed superconducting maglev submersible CLP.

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Experimental Investigations of Novel Compound Bearing of Superconducting Magnetic Field and Hydrodynamic Fluid Field

Cited by 9 publications

References 28 publications

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

Theoretical Evaluation on Lubrication Performance of Thrust-Type Foil Bearings in Liquid Nitrogen

Analysis and testing of a superconducting maglev submersible cryogenic liquid pump

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