Article
Thermodynamics
Yuan Chen, Qinggang Wang, Xudong Peng, Yuntang Li, Bingqing Wang, Jie Jin
Summary: Based on the theory of gas lubrication and elastic mechanics, this study presents a theoretical model of gas-elastic coupling lubrication for compliant foil face gas seals (CFFGS). The correlation between film pressure and thickness of CFFGS and their effects on the flow field are investigated, and the differential effect of pressure conditions on the flow field and sealing performance is analyzed. The influence of operating and structural parameters on sealing performance is also explored. Results show that CFFGS have stable and excellent leakage control performance, and the pressure forms have a differential effect on the coordination mechanism of film pressure-deformation-film thickness and sealing performance. Moreover, compliant foil structure has a positive impact on the end-face adaptive capability and leakage control performance of the seal.
ADVANCES IN MECHANICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Jie Xu, Shurong Yu, Xuexing Ding, Haitao Jiang, Lu Li
Summary: This paper investigates the effect of different textures on the sealing performance of compliant foil gas film seals. The results show that the gas volume accommodated by the texture has a greater impact on the sealing performance, and a convergent texture can effectively control the leakage rate. When the texture depth exceeds a certain value, the sealing system may become unstable. The compliant foil seal is well suited to higher-speed service conditions, and the inverted triangular texture shows the best comprehensive sealing performance.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Chemical
Xueliang Wang, Meihong Liu
Summary: This paper analyzes the dynamic performance of compliant foil gas seal with different structure parameters, and obtains the influence rules of parameters such as seal diameter, seal length and gas film thickness on the sealing performance. The results show that suitable structure parameters can improve the stability and dynamic characteristics of compliant foil gas seal.
Article
Engineering, Mechanical
Yuan Chen, Kai Chen, Xudong Peng, Yuntang Li, Xiaolu Li, Bingqing Wang, Jie Jin
Summary: This paper presents the transient elasto-aerodynamically coupling behavior and adaptive mechanism of a bump-type compliant foil face gas seal (BCFFGS) considering the disturbance of film thickness. A numerical solution for the elasto-aerodynamically coupling model of BCFFGS is obtained using the finite difference method based on gas lubrication and elasticity theories. The influence of axial and angular film thickness disturbances on transient sealing performance is analyzed. The results show that the compliant support structure effectively enhances the anti-disturbance capability of the gas film and suppresses large fluctuations of the opening force.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Yuan Chen, Cong Xiong, Yuntang Li, Xiang Li, Xiaofeng Xue, Bingqing Wang, Yuan Gan
Summary: This study focuses on the floating seal dam compliant foil face gas seal (FSD-CFFGS) and compares its dynamic performance with the rigid surface face gas seal (RSFGS) using the coupling method. By solving the seal dynamics equation, transient Reynolds equation, and foil deformation equation, the researchers found that the dynamic performance of FSD-CFFGS is significantly improved compared to RSFGS. They also found that optimizing parameters such as the supporting foil compliance coefficient and spring stiffness can further enhance the dynamic performance.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Yuan Chen, Qinggang Wang, Yuntang Li, Xiaolu Li, Bingqing Wang, Jie Jin
Summary: To investigate the influence of hypervelocity gas effects on gas lubrication performance, a modified gas-elastic coupling lubrication theory model is used, taking into account choked flow and inertia effect. The analysis reveals that choked flow significantly increases sealing outlet pressure and reduces flow velocity. The increase in medium pressure and balance film thickness worsens the choking effect and leads to an increase in opening force and a decrease in leakage rate. The inertia effect causes radial flow velocity reduction and wide pressure distribution, especially under high rotational speed and pressure, resulting in a decrease in opening force and leakage rate.
Article
Engineering, Mechanical
Wang Wei, Hao Liu, Chenhao Guo, Haoyi Jiang, Xiaoping Ouyang
Summary: In this paper, a vibration model of the reciprocating seal is established for the first time, and the effects of vibration on sealing performance are revealed. The study shows that vibration affects sealing performance, with maximum leakage rate at the resonance point and decreasing as the vibration frequency moves away from the resonance frequency. Increasing the vibration amplitude increases the net leakage rate.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Acoustics
Signe T. Heinemann, Janus W. Jensen, Sebastian von Osmanski, Ilmar F. Santos
Summary: There is no consensus on the best practice for modelling the compliant foil structure of Gas Foil Bearings (GFBs) in the literature. This paper focuses on the modelling of the top foil and compares four different top foil models (with and without gas injection) in terms of steady state analysis efficiency and accuracy. The results show that the model using Euler-Bernoulli beam elements is both computationally efficient and accurate for steady state analysis compared to the model using non-curved shell elements.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Aerospace
Zeyu Wu, Xiang Luo, Jianqin Zhu, Hang Chen, Jiahua Liu
Summary: The study focused on the windage loss caused by protrusion in a rotor-stator cavity, revealing that the protrusion shape can impact sealing efficiency, a factor often overlooked in previous researches. Experimental investigation of several typical protrusion shapes showed varying degrees of improvement in total pressure and sealing efficiency, with drop shape demonstrating the best overall performance among the eight models tested.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Chemistry, Physical
Filip Wasilczuk, Pawel Flaszynski, Lukasz Pyclik, Krzysztof Marugi
Summary: This paper analyzes the methods for manufacturing turbine blades, highlighting the potential of manufacturing slots in the shroud region to control shroud leakage flow. A parametric study on bypass slot dimensions is conducted using numerical simulations, showing the most effective dimensions and explaining why they are effective. An interesting finding is that a slot not covering the entire span of the fin is more effective than one that does, due to the creation of additional streamwise vortices.
Article
Engineering, Chemical
Bingjun Gao, Han Gao, Junhua Dong, Yongming An, Chuanzhi Wang
Summary: This paper investigates the sealing performance of B-ring sealing structures, finding that B-rings with high yield stress can meet the sealing requirements but experience plastic deformation, while B-rings with low yield stress exhibit significant plastic deformation during startup and leakage during shutdown. However, minimizing interference and adjusting the wave radius moderately can reduce the leakage parameters.
Article
Engineering, Mechanical
Kuo Liu, Lingsheng Han, Yongqing Wang, Haibo Liu, Di Zhao, Xu Li, Shaowei Jiang
Summary: This study focuses on theoretically modeling the cryogenic labyrinth seal in the spindle, presenting new leakage equations for quantitative calculation and revealing the effects of deformation and cavitation on sealing capacity. Experimental data validations indicate that seal structural parameters and fluid physical variables heavily influence sealing effectiveness, with deformation leading to leakage increase and cavitation causing leakage decrease. It is found that cavitation has a greater impact on leakage than deformation when below the critical supercooling, and factors like low inlet pressure, low supercooling, and seal material with low thermal expansion coefficient can promote sealing capability.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Chemistry, Inorganic & Nuclear
Hujun Wang, Zhongquan Gao, Xinzhi He, Zhenkun Li, Jinqiu Zhao, Zhuo Luo, Yaqun Wei
Summary: When sealing liquids with magnetic fluid, the interaction between the magnetic fluid and the sealed liquid affects the interfacial stability and results in poor sealing performance. To overcome this, a combined magnetic fluid and back blade seal is designed and tested. The results show that the combined seal has better performance at higher shaft speeds, with the back blade seal playing a main role and the magnetic fluid seal preventing leakage.
Article
Engineering, Electrical & Electronic
Hujun Wang, Zhongquan Gao, Yuan Meng, Yan Li, Qiang Zhang
Summary: When the ferrofluid is used to seal liquid, the relative movement between the ferrofluid and the sealed liquid causes poor sealing performance and stability issues. To improve this, a ferrofluid-spiral labyrinth combined seal structure was designed and tested. The experimental results showed that this combined seal had better sealing performance compared to the ferrofluid-spiral combined seal. It can effectively solve the failure and leakage problems of ferrofluid and spiral seals at different speeds.
INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
(2023)
Article
Engineering, Aerospace
Yizhen Zhao, Chunhua Wang
Summary: Research on reducing gas leakage through shape optimization of a straight labyrinth seal, using a chaotic optimization algorithm and least square support vector machine to determine the optimal seal design parameters, has achieved promising results.
