Leakage and rotordynamic analysis of a high pressure floating ring seal in the turbo pump unit of a liquid rocket engine

Ha, Tae-Woong; Lee, Yongbok; Kim, Chang‐Ho

doi:10.1016/s0301-679x(01)00110-4

Cited by 39 publications

(18 citation statements)

References 4 publications

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“…When the rotor whirling is neglected, the lock-up area boundary (0.658) almost equals the prediction of lock-up position (0.678) in the Ha et al. 18 However, with rotor whirling radius increasing, the boundary gradually shrinks. When the whirling radius increases to one fifth of seal clearance, the lock-up area (<0.399) is much smaller than that under no whirling condition (<0.658).…”

Section: Resultsmentioning

confidence: 59%

“…To simplify the problem, it is reasonable to neglect the gravity that is much smaller than the hydrodynamic force and the friction, as it was in Arghir et al. 21 For a typical floating ring seal, 18 the ring weight (0.5 N) is only three orders of magnitude less than the friction force (548 N).…”

Section: Analytical Modelmentioning

confidence: 99%

“…Actually, the condition was paradoxical for separating the force equilibrium of friction, film force and gravity when the floating ring locked up. In the study of Ha et al., 18 floating ring seals were regarded as journal bearings, and the initial position for zero speed was placed at the maximum eccentricity where floating rings were in contact with rotor surface due to gravity. With the increase in the rotating speed, the floating rings moved toward rotor geometric center and finally locked up.…”

Section: Introductionmentioning

confidence: 99%

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Lock-up characteristics of floating ring seals considering rotor whirling motion

Xia

Liu

Yan

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents a lock-up condition with rotor whirling motion to predict the lock-up area for floating ring seals in liquid turbopumps. To calculate the hydrodynamic forces with arbitrary rotor motion, bulk flow model is modified with explicitly considering the squeeze velocity and temporal inertia. Finite element method is implemented to solve the transient nonlinear model. The effect of lock-up position on leakage and rotordynamic coefficients of floating ring seals is studied and shows insensitivity to eccentricity within moderate eccentric area (<0.5), which indicates that predicting lock-up area with the lock-up condition is feasible for application. With circular trajectory of rotors, the effects of rotor whirling radius and friction force on lock-up area are investigated. The results show that the lock-up area shrinks toward rotor whirling center, with the increase in the rotor whirling radius and decrease in the friction force. Further, a coupled method of rotor trajectory and floating ring seal lock-up area is presented to consider the interaction between rotors and floating ring seals. The results show that the effect of the interaction on the lock-up area is almost negligible, as lock-up position of floating ring seals has little effect on rotor trajectory. In addition, the effect of the seal configuration on the lock-up area is studied.

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Section: Resultsmentioning

confidence: 59%

Section: Analytical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lock-up characteristics of floating ring seals considering rotor whirling motion

Xia

Liu

Yan

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…(1)-(4)과 같다 (3) . 여기서 Pot는 펌프 출구전압, Pit는 입구전 압, Ut2는 임펠러 끝단 속도, Ps는 측정 위치에서의 정압, FA 는 축추력 측정값(입구 유동 방향이 양의 값), rt2는 임펠러 끝단 반지름, h는 베인의 높이이다.…”

Section: 시험 분석에 사용한 주요 무차원 변수와 그 정의는 식unclassified

Axial Thrust Control of High-speed Centrifugal Pump with Cavity Vanes

Kim¹,

Choi²,

Noh³

et al. 2012

Journal of Fluid Machinery

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A high-speed centrifugal pump requires more attention to the control of its axial thrust due to the high discharge pressure than a conventional industrial pump. Vanes employed toward the rear cavity of the impeller can be an effective device to control the axial thrust of the pump. The vanes disturb circumferential flow of the cavity and it can modify the axial force acting on the impeller. In this paper, three types of vanes are installed in the high-speed centrifugal pump for liquid rocket engines and the thrust of the pump is measured with an additional thrust measurement unit. According to the results, shapes of cavity vanes have effects on the axial thrust of the pump. As the height of vanes increases, the outlet pressure of the rear floating ring seal decreases which results in a decrease of the thrust. On the other hand, head of the pump is almost same regardless of cavity vanes. Also, the pressure drop of the bypass pipeline increases when vanes are removed. † 서 론

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“…Given the uncertainty surrounding both the expected leakage and rotordynamic performance of the floating bushing seals, a number of other seal technologies were also explored for their viable use with the GEL bearing test rig. These seals included lip seals [122,123], labyrinth seals [124][125][126][127][128][129][130][131][132][133][134], a variety of annular seals including bushing, ring, honeycomb, and hole pattern seals [135][136][137][138][139][140][141][142][143][144][145][146], centrifugal motion seals [47,147,148], and mechanical seals [149][150][151][152][153][154][155][156][157][158][159][160][161][162][163]. However, these sealing technologies also faced a number of technical hurdles to being implemented in GEL environments including Hence, after considering the uncertainty surrounding the cu...…”

Section: Bearing Sealsmentioning

confidence: 99%

Gas-Expanded Lubricants for Increased Energy Efficiency and Control in Rotating Machinery

Weaver¹

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Leakage and rotordynamic analysis of a high pressure floating ring seal in the turbo pump unit of a liquid rocket engine

Cited by 39 publications

References 4 publications

Lock-up characteristics of floating ring seals considering rotor whirling motion

Lock-up characteristics of floating ring seals considering rotor whirling motion

Axial Thrust Control of High-speed Centrifugal Pump with Cavity Vanes

Gas-Expanded Lubricants for Increased Energy Efficiency and Control in Rotating Machinery

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