Failure Analysis of Ball-Bearing of Turbo-Pump Used in Liquid Rocket Engine

Venkateswarlu, Vartha; Kumar, M Suresh; Mathew, Saxon; Bejoy, John; Thomas, Tharian K.; Shajimon, A. Cheriang

doi:10.4028/www.scientific.net/msf.830-831.709

Cited by 4 publications

(1 citation statement)

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“…The concomitant overheating and mechanical wear may even lead to the sudden failure of REBs. In rocket turbopumps, another common failure mode of REBs is the breakdown of the rollers and retainer caused by the impact load [23]. Especially at the start-up stage, the sudden increase in loads makes that REBs easily present such failure.…”

Section: The Role Of Rebsmentioning

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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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: The Role Of Rebsmentioning

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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Study of temperature fields in a ball bearings bodies under boundary conditions of the third kind

Popov

Iglin

Gubareva

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The reliability of the rolling bearing body directly affects the continuity and duration of operation of industrial equipment. Ball bearings are often used in centrifugal pumps of thermal power plants and water supply systems. Overheating and subsequent failure of such bearings lead to failure of pumping equipment. To avoid such breakdowns, it is necessary to study the thermal processes inside the rolling elements, which can lead to their deformation and destruction. In this paper, the problems of non-stationary heat transfer inside rolling bodies (spherical bodies) are considered. An analytical solution of the problem in dimensionless values of temperatures and coordinates is obtained on the basis of Fourier and Bubnov-Galerkin methods under boundary conditions of the third kind. The solution of such a problem requires the use of an extensive mathematical apparatus, so special software tools such as Mathcad and MatLab were used in the work. So solving the problem analytically in dimensionless quantities is convenient because it allows you to scale the results to all such objects without reference to a specific rolling body. As a result, the solution is obtained in the form of a power polynomial that does not contain special functions.

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Root Cause Failure Analysis of Deep-Groove Ball Bearing Used in a Governor

Hou

Liu²,

Li³

et al. 2022

Applied Sciences

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Premature failure of a deep-groove ball bearing used in an aeroengine governor took place during service. In this paper, the failure mode and root cause of the bearing were studied by macroscopic and microscopic examination, metallographic analysis, hardness test, calculations of contact stress and L10 life, flatness measurement and comparative experiment. The results show that the failure modes of the inner ring raceway and steel balls are contact fatigue spalling, the failure modes of the outer ring raceway are wear and contact fatigue spalling, and the failure mode of the cage is fatigue fracture. The root cause and direct cause of the bearing failure were the unqualified machining process of the spring end face and the high unbalanced axial load, respectively. The unqualified machining process induced high points of the spring end face, which caused misalignment of the outer ring and inner ring and thereby resulted in the high unbalanced axial load. The characteristic damages induced by high axial load were climbing with the morphology of metal extrusion and accumulation at the border of the raceway for the inner and outer ring, and multiple fatigue fractures with the characteristic of multi origins for the cage. The unqualified machining process can be prevented by adopting the refined grinding process and adding detection requirements of flatness.

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Failure Analysis of Ball-Bearing of Turbo-Pump Used in Liquid Rocket Engine

Cited by 4 publications

References 0 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

Study of temperature fields in a ball bearings bodies under boundary conditions of the third kind

Root Cause Failure Analysis of Deep-Groove Ball Bearing Used in a Governor

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