Concurrent theoretical, experimental and numerical analyses of mixed-flow turbopump design

Apollonio, Alessandro; Anderlini, Alessandro; Valentini, Dario; Pace, Giovanni; Pasini, Angelo; Salvetti, Maria Vittoria; d’Agostino, Luca

doi:10.1016/j.ast.2022.107459

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…Due to the urgent requirement for delivering cryogenic medium (such as LOX and LCH4) over a wide flow range, the pump performance under off-design condition has been researched widely. Experimental test and numerical simulation are the two main methods that provide an in-depth understanding on this issue [10,11]. Currently, due to the high cost of experimental test and improved accuracy of numerical simulation, the research strategy of preliminary simulation analysis and final experimental verification is generally adopted [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Rotating Speeds and Thermodynamic Effects on LOX Turbopump Performance

Fu²,

Cong

et al. 2023

International Journal of Aerospace Engineering

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As a key factor of a reusable turbopump, axial thrust directly determines the reliability of the bears and seals, especially considering the influence of rotational speeds and thermodynamic effects. In this study, numerical simulations and experimental tests were conducted to explore the impact of rotational speeds and the divergences of the turbopump performance with/without the thermodynamic effects. The experimental data obtained at 15000 r/min are in good agreement with the numerical results, illustrating the validity of the numerical model. The results show that the head deviations based on the affinity laws are relatively smaller, only 0.1% difference at normal condition, yet the efficiency increases from 72.5% to 73.8%, which need to be modified through the formula correction. Notably, the axial thrusts acting on impeller are significantly affected by the rotational speeds, and the values at rated flowrate decrease 17.6% after increasing the operating condition to rated speed. The affinity laws are not applicable for obtaining the turbopump axial thrusts under different speeds. Furthermore, due to the changes of the local physical properties, the values of head coefficient and efficiency decrease 2.8% and 1.3% at rated flowrate, respectively, when the thermodynamic effects of liquid oxygen are considered. Meanwhile, the relative variations of axial thrust are between 1.46% and 3.74% within the whole flow range. Finally, an in-depth analysis of the internal flow was conducted through the velocity field and vorticity method. In conclusion, both the rotational speeds and thermodynamic effects significantly affect the performance of a cryogenic turbopump, especially the axial thrust, and the unsteady results of the rotor-stator cavity leakage flow need to be analyzed in the future.

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Section: Introductionmentioning

confidence: 99%

Influence of Rotating Speeds and Thermodynamic Effects on LOX Turbopump Performance

Fu²,

Cong

et al. 2023

International Journal of Aerospace Engineering

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“…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]. At the same time, stiffness was an important factor affecting the dynamic characteristics [6,7].…”

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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Subdomain adaptation joint attention network enabled two-stage strategy towards few-shot fault diagnosis of LRE turbopump

Zhao,

Liu,

Miao

et al. 2024

Advanced Engineering Informatics

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Concurrent theoretical, experimental and numerical analyses of mixed-flow turbopump design

Cited by 5 publications

References 13 publications

Influence of Rotating Speeds and Thermodynamic Effects on LOX Turbopump Performance

Influence of Rotating Speeds and Thermodynamic Effects on LOX Turbopump Performance

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

Subdomain adaptation joint attention network enabled two-stage strategy towards few-shot fault diagnosis of LRE turbopump

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