Intense vibration mechanism analysis and vibration control technology for the combustion chamber of a liquid rocket engine

Du, Dahua; He, Enhui; Huang, Daoqiong; Wang, Guangxu

doi:10.1016/j.jsv.2018.08.023

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…Given the complexity of real structures, the computational time cost is high. To ensure the characteristics of the original model, the principle of mass stiffness equivalence was used to simplify the model swing device (Du et al , 2018). The armoured structure of the outer layer of the bellows in the swing device was omitted; eight layers of the bellows were simplified to one layer, and the friction coefficient between the structures in the swing device was set to 0.03.…”

Section: Simulation Scheme and Model Simplificationmentioning

confidence: 99%

“…Zhang et al (2020; Jiang et al , 2007; Li and Zhang, 2023) used the fluid–solid coupling numerical method to examine flow-induced vibration characteristics in rotating machinery. Du et al (2018) analysed the structural vibration of the combustion chamber of a high-thrust liquid rocket engine and identified the coupling characteristics of the combustion chamber sound pressure and vibration signal. The acoustic-vibration coupling mechanism of the combustion chamber was decoupled by increasing the stiffness of the combustion chamber construction, and the vibration acceleration during thermal testing decreased by 2/3.…”

Section: Introductionmentioning

confidence: 99%

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Research on vibration characteristics of rocket engine flow pipeline

Yong,

Wu-Qi

2024

AEAT

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Purpose Abnormal vibrations often occur in the liquid oxygen kerosene transmission pipelines of rocket engines, which seriously threaten their safety. Improper handling can result in failed rocket launches and significant economic losses. Therefore, this paper aims to examine vibrations in transmission pipelines. Design/methodology/approach In this study, a three-dimensional high-pressure pipeline model composed of corrugated pipes, multi-section bent pipes, and other auxiliary structures was established. The fluid–solid coupling method was used to analyse vibration characteristics of the pipeline under various external excitations. The simulation results were visualised using MATLAB, and their validity was verified via a thermal test. Findings In this study, the vibration mechanism of a complex high-pressure pipeline was examined via a visualisation method. The results showed that the low-frequency vibration of the pipe was caused by fluid self-excited pressure pulsation, whereas the vibration of the engine system caused a high-frequency vibration of the pipeline. The excitation of external pressure pulses did not significantly affect the vibrations of the pipelines. The visualisation results indicated that the severe vibration position of the pipeline thermal test is mainly concentrated between the inlet and outlet and between the two bellows. Practical implications The results of this study aid in understanding the causes of abnormal vibrations in rocket engine pipelines. Originality/value The causes of different vibration frequencies in the complex pipelines of rocket engines and the propagation characteristics of external vibration excitation were obtained.

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Section: Simulation Scheme and Model Simplificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on vibration characteristics of rocket engine flow pipeline

Yong,

Wu-Qi

2024

AEAT

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“…With the increasing performance requirements of combustion chambers and increasingly stringent emission regulations [1][2][3][4], gas turbine combustion chambers are required to operate at high temperature and high pressure [5][6][7][8][9], which usually leads to the occurrence of combustion instability [10][11][12][13][14][15][16][17]. The combustion instability phenomenon will be accompanied by pressure pulsation and exothermic pulsation in the flow field inside the combustion chamber [18][19][20][21], which leads to vibration of the combustion chamber components and affects the safe operation of the engine [22][23][24]. In order to solve the adverse effects of combustion instability on the combustion chamber, it is necessary to study the combustion instability phenomenon to prevent the combustion instability phenomenon from leading to a decrease in the combustion chamber's stable operation time.…”

Section: Introductionmentioning

confidence: 99%

Impact of Oxygen Content on Flame Dynamics in a Non-Premixed Gas Turbine Model Combustor

Chen,

Huang,

Wang

et al. 2024

JMSE

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In this study, large eddy simulation (LES) was used to investigate the dynamic characteristics of diffusion flames in a swirl combustion chamber at an oxygen content of 11–23 wt% and temperature of 770 K. The proper orthogonal decomposition (POD) method was employed to obtain flame dynamic modes. The results indicate that oxygen content has a significant impact on the downstream flow and flame combustion characteristics of the swirl combustion chamber. With oxygen content increasing, the size of the recirculation zone is reduced, and the flame field fluctuations are intensified. The pressure and heat release fluctuations under different oxygen contents were analyzed using frequency spectrum analysis. Finally, the flame modes were analyzed using the POD method, and it was found that the coherent structures are asymmetric relative to the local coordinate system. At an oxygen content of 11 wt%, they exhibit larger coherent structures, while at an oxygen content of 23 wt%, they exhibit numerous turbulent structures.

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Bionic Vibration Isolator Inspired by Goat Hind Limb

Shi

Chen

et al. 2023

J Bionic Eng

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Intense vibration mechanism analysis and vibration control technology for the combustion chamber of a liquid rocket engine

Cited by 6 publications

References 8 publications

Research on vibration characteristics of rocket engine flow pipeline

Research on vibration characteristics of rocket engine flow pipeline

Impact of Oxygen Content on Flame Dynamics in a Non-Premixed Gas Turbine Model Combustor

Bionic Vibration Isolator Inspired by Goat Hind Limb

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