Rotordynamic Analysis of a Turbopump with the Casing Structural Flexibility

Jeon, Seong Min; Kwak, Hyun-Duck; Yoon, Suk Hwan; Kim, Jinhan

doi:10.2514/1.33551

Cited by 22 publications

(4 citation statements)

References 2 publications

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“…터보펌프는 엔진에 산화제와 연료를 공급하는 역할 을 담당하는데, 지금까지 국내에서는 30톤급 저추력 액 체로켓엔진에 적용가능한 실험용 터보펌프를 개발하여 국외 실매질 시험을 진행해 오고 있다 [1,2]. 저추력급 엔 진용 터보펌프는 회전체동역학 [3], 베어링 [4], 실 [5,6] 등 국산화 개발을 위한 심층적인 연구들이 수행되어 왔다. 한편 자력 발사용 국산화 엔진은 실험용 저추력급 엔 진보다 요구되는 추력이 증가된 75톤급 고추력 엔진 개 발을 필요로 하게 되어 관련된 핵심요소의 설계 및 시 험이 진행 중에 있다 [7][8][9].…”

Section: 서 론unclassified

Evaluation of Friction Torque for a Turbopump Ball Bearing

Jeon

Kwak²,

Kim³

2011

Journal of the Korean Society of Tribologists and Lubrication E

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Rolling contact ball bearings are utilized almost exclusively for liquid propellant rocket engine turbopump. Turbopump ball bearings are required to endure high speed and high load for a poor lubricated condition in cryogenic environment. To evaluate bearing heat generation performance, friction torque is investigated as a function of rotation speed, bearing load and cooling flow rate through an experimental study using water coolants. Radial and axial loads are simultaneously applied to the test bearing by gas pressurized cylinder rod. Endurance performance of bearing has been also verified under the bearing required load for operating condition during total accumulated test time 2,100 sec.

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Section: 서 론unclassified

Evaluation of Friction Torque for a Turbopump Ball Bearing

Jeon

Kwak²,

Kim³

2011

Journal of the Korean Society of Tribologists and Lubrication E

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“…The turbopump becomes the main component of liquid rocket engines, which operate at high speeds and high power densities. It causes significant vibration of the rotor [1][2][3]. Service performance will deteriorate and even lead to severe failure of the rocket engine [4,5].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Rotordynamic Characteristics of Turbopumps with Angular Contact Ball Bearings

Su,

Xu,

Gao

et al. 2023

Vibration

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The support stiffness of the turbopump rotor system with angular contact ball bearing varies with the rotational speed, which leads to the inaccurate prediction of the dynamics of the turbopump rotor system. The model of the rotor bearing system was constructed based on the theoretical model of angular contact ball bearing stiffness, and the dynamics characteristics of the turbopump system were calculated. To verify the accuracy of the stiffness and the dynamics model, a test system of the turbopump rotor with angular contact ball bearings was designed. Since the bearing stiffness cannot be measured directly, a stiffness identification model was introduced, and an unbalanced response test was conducted to verify the dynamics model. It was found that the turbopump bearing stiffness increased dynamically with speed and reduced the unbalance response of the rotor. The results show that the angular contact ball bearing stiffness model and the dynamics model of the rotor support system are accurate and provide support for the dynamics design of the turbopump rotor system with angular contact ball bearings.

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“…They found out that the rear bearing stiffness was the most important parameter for the critical speed and instability, because the first vibration mode of the rotor was turbine side shaft bending mode. Jeon et al [13] used 1D and three-dimensional finite element methods to perform critical speed analysis of a 30-ton thrust turbo pump while considering the casing structural flexibility. They also analyzed the effect of loads on the bearings on the dynamic behavior of the rotor.…”

Section: Introductionmentioning

confidence: 99%

On The Finite Element Modeling Of Turbo Machinery Rotors In Rotor Dynamic Analysis

Jalali¹,

Nouri²,

Ziaei-Rad³

2018

Progress in Canadian Mechanical Engineering

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In this study, a program based on finite element method is developed for rotor dynamic analysis of gas turbine rotors. In the FE model of the rotors, various minor and major parts of the rotor are modeled using the cylindrical and tapered Timoshenko beam elements and the lateral vibration behavior of the rotor is evaluated. In the paper, the lateral vibration behavior of a certain gas turbine rotor is analyzed using the developed finite element program and coupled lateral-torsional vibration behavior of the rotor is analyzed using 3D finite element model. A good agreement exists between the results obtained from two FE models. Two design models are used for the rotor one of which has 2 bearings and the other one has 4 bearings with specific locations. The effects of the number of the bearings on the critical speeds, operational deflection shapes and unbalance response of the rotor is investigated. It is found that the number of the bearings has significant effect on the first critical speed but slight effect on the second and third critical speeds. It is demonstrated that the number of the bearings can be used as one of the system design parameters.

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Rotordynamic Analysis of a Turbopump with the Casing Structural Flexibility

Cited by 22 publications

References 2 publications

Evaluation of Friction Torque for a Turbopump Ball Bearing

Evaluation of Friction Torque for a Turbopump Ball Bearing

Investigation on the Rotordynamic Characteristics of Turbopumps with Angular Contact Ball Bearings

On The Finite Element Modeling Of Turbo Machinery Rotors In Rotor Dynamic Analysis

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