Article
Engineering, Mechanical
Duan Yang, He Liu, Jianfeng Zhong, Xiang Zhu, Yu Dai
Summary: This paper investigates the impact of nozzle layouts on the lubrication and cooling performance of spur gears under oil jet lubrication conditions. A heat-flow coupled analysis method is introduced to predict the temperature field of the tooth surface with different nozzle layouts. The numerical results show that the heat-flow coupled model provides accurate temperature prediction and the nozzle layouts significantly influence the lubrication and cooling performance. Additionally, the study reveals that the lubrication performance is relatively superior when the nozzle approaches the side of the pinion.
Article
Engineering, Multidisciplinary
Bin Ouyang, Feiyue Ma, Yu Dai, Yanyang Zhang
Summary: This study investigates the influence of nozzle layouts on the lubrication performance of face gears with oil-jet lubrication. The results show that nozzle layouts significantly affect lubrication performance, with better lubrication performance observed for lateral layout parameters near the middle point of the tooth width.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2021)
Article
Engineering, Mechanical
X. Zhu, Y. Dai, F. Ma, B. Ouyang
Summary: In the aeroengine industry, the oil jet layout plays a significant role in lubrication of high-speed transmission gears. Through the establishment of a mathematical model and computational fluid dynamic simulations, the effectiveness and reliability of oil jet lubrication can be validated, providing valuable design methods and technical guidance for optimization of oil jet lubrication for various practical gears.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Jianfeng Zhong, Yu Dai, Chongyu Liang, Xiang Zhu, Lanjin Xu
Summary: In aero-engines applications, nozzle geometric parameters significantly affect the accurate lubrication of target components. Computational fluid dynamics (CFD) technique combined with the volume of fluid (VOF) method and SST k-omega turbulence model is used to investigate the flow characteristics of the nozzle. The results demonstrate that adjusting the nozzle geometry can lead to higher jet velocity and smaller jet deviation. Experimental tests validate the consistency between numerical and actual results.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Mechanical
Yu Dai, Chongyu Liang, Xi Chen, Xiang Zhu
Summary: Understanding the behavior of oil jet lubrication is critical for determining energy consumption in aeronautical transmission systems. This study presents theoretical models and numerical investigations to analyze the impact of oil jet on gear flank. The results show good agreement with theoretical calculations, providing methods and foundations for further research on oil jet lubrication.
Article
Chemistry, Multidisciplinary
Jiansong Zhang, Yongsheng Liu, Xing Qin, Zijun Dou, Xiaonan Xu, Jianguo Lv
Summary: This study investigates a nozzle structure design method based on bionic non-smooth theory. By optimizing the structural parameters of the nozzle, a bionic straight cone nozzle with superior hydraulic performance was designed, and its performance was simulated using CFD. The research results provide scientific and valuable references for borehole hydraulic mining of high-pressure water jets in oil shale drilling.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Multidisciplinary
Lukasz Jedlinski, Arkadiusz Syta, Jakub Gajewski, Jozef Jonak
Summary: This study conducted linear and nonlinear analyses on a commonly used cylindrical gear to detect the extent of tooth damage. Due to vibrations and disturbances in the test equipment, traditional vibration signal analysis methods failed to provide conclusive and satisfactory results. Therefore, nonlinear recurrence analysis was adopted to address the issue of determining the level of gear tooth damage.
Article
Mechanics
Xingbao Huang, Weijun Wang, Lichao Ding, Bintang Yang
Summary: Ferrofluids, favored for their unique properties, exhibit superior lubrication performance in enhancing anti-wear and prolonging service life of gear pairs, with factors such as magnetic field intensity, ferromagnetic particle size, and bulk concentration significantly affecting their tribological properties and film stiffness in oil-based ferrofluids.
Article
Engineering, Aerospace
Wutekuer Nuermaimaiti, Xuewu Liu, Pengze Yan, Zongrui Wang, Dapen Hu
Summary: Based on active flow control technology, this paper investigates the output characteristics of wall jets and the performance of a disc-type jet oscillator. Through experiments and simulations, it is found that the disc jet oscillator with a double-bend inlet and a multi-pipe outlet structure exhibits satisfactory oscillation performance.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Article
Engineering, Mechanical
Thibaut Torres, Christophe Changenet, Thomas Touret, Berengere Guilbert
Summary: The purpose of this study is to analyze the heat transfer between an oil jet flow and a rotating gear using experimental data. The study found that the rotational speed does not always have a positive correlation with heat transfer.
Article
Engineering, Mechanical
Jiang Zhao, Lei Hou, Zhengminqing Li, Hong Zhang, Rupeng Zhu
Summary: The presence of root cracks in gears significantly impacts their dynamic performance by altering meshing stiffness and tribological characteristics, leading to changes in load distribution ratios and vibration.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
Saeed Aamer, Farshid Sadeghi, Andreas Meinel
Summary: The investigation aims to analyze the impact of cage pocket conformality on lubrication in a cylindrical roller bearing. A custom Bearing Cage Friction Test Rig was used to simulate a lubricant bath environment and observe lubricant flow. By developing a two-phase computational fluid dynamics model and conducting experiments, it was found that the conformality of the pocket design affects both the friction and lubricant distribution in the cage, with the least conformal design experiencing minimum friction but facing challenges in lubricant retention and air entrapment.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Roman Mykhailyshyn, Frantisek Duchon, Ivan Virgala, Peter Jan Sincak, Ann Majewicz Fey
Summary: The article presents a numerical simulation model for airflow dynamics in the nozzle and radial gap of a Bernoulli gripping device. The optimal parameters of the device and the influence of nozzle geometry on pressure distribution and lifting force are determined. The C-Factor is used to determine the optimal gap height between the device and the manipulated object, enabling efficient operation of Bernoulli gripping devices in automated handling operations.
Article
Engineering, Mechanical
Jongin Yang, M. M. Khonsari, Alan Palazzolo
Summary: This study introduces an advanced theoretical modeling methodology and simulation procedure to evaluate granular lubrication performance, using a computational approach based on the Euler-Eulerian multiphase flow model. The predictions of the model are verified by experimental data, and a parametric study is conducted to assess the influence of critical input parameters, providing valuable information for suitable and efficient granular lubricating system design.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Jiang Zhao, Wei Sheng, Zhengminqing Li, Hong Zhang, Rupeng Zhu
Summary: Considering tooth surface micro-morphology, a coupling analysis model for wear characteristics of involute gear under mixed lubrication was established. The mixture of squalane base oil and polyisoprene showed higher film thickness and lower coefficient of friction compared to polyalphaolefin oil and mineral oil. Increasing lubricant viscosity was found to reduce direct rough contact area and load ratios, thereby reducing wear.
TRIBOLOGY INTERNATIONAL
(2022)
