Simulation and experimental study on the influence of oil groove structure on the drag torque of the wet clutch

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Chengjun Wang ◽  
Wujian Ding ◽  
Xudong Zheng ◽  
Haiqiang Zhu ◽  
Zuzhi Tian ◽  
...  
Keyword(s):  
Heat Dissipation ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Reference Object ◽  
Drag Torque ◽  
Content Type ◽  
Oil Film ◽  
Wet Clutch ◽  
Groove Structure ◽  
Dimensional Simulation

Purpose This paper aims to design a single and double throat oil groove structure, which can reduce the drag torque of the wet clutch. Design/methodology/approach A three-dimensional simulation model was established herein using the computational fluid dynamics method. The influence of oil groove structure on the oil film flow field and the drag torque is obtained by a simulation. Findings Compared with the traditional radial oil groove, the results show that the single throat oil groove structure reduces the drag torque by about 24.59%; the double throat oil groove reduces the drag torque by about 47.27%. As the speed difference increases, the average temperature rise of the oil film of the double throat oil groove is 4°C lower than that of the single throat oil groove, indicating that it has good heat dissipation performance. The analysis results were verified by experimental results. Originality/value In this paper, the radial oil groove is taken as the reference object, and the structure of the oil groove is designed and improved. The simulation analysis and experiment verify the rule of the influence of the oil groove structure on the drag torque, which provides a new design idea for reducing the drag torque of wet clutch.

Model for the prediction of drag torque characteristics in wet clutch with radial grooves

2018 ◽  
Vol 233 (12) ◽  
pp. 3043-3056 ◽  
Author(s):  
Lin Zhang ◽  
Chao Wei ◽  
Ji Bin Hu
Keyword(s):  
Flow Rate ◽  
Rotational Speed ◽  
Heat Dissipation ◽  
Maximum Speed ◽  
Drag Torque ◽  
Cross Sectional ◽  
Oil Film ◽  
Oil Supply ◽  
Wet Clutch ◽  
Film Lubrication

Drag torque can cut down the efficiency of the vehicle transmission system. So it should be reduced on the premise of normal vehicle lubrication and heat dissipation. The purpose of this paper is to analyze the variation rule of drag torque in single-plate wet clutch from the perspective of flow rate, density, and viscosity. In the theoretical model of drag torque, the flow field is divided into oil film area and cavitation zone. Based on the mass flow conservation and viscosity–pressure equation, the equivalent density and viscosity of each node in each region are obtained. Then the total drag torque is calculated through the sum of each node’s torque. Finally, the curves of drag torque with rotational speed under different working conditions are obtained by numerical calculation, and they have been tested and verified. Through this research, the following conclusions can be reached: the rotational speed of the peak of drag torque is near the maximum speed where full oil film lubrication is realized. While temperature declines, it will lead to higher viscosity, then the speed of the lubricant along the radial direction will decrease, resulting in the increase in maximum speed of full oil film lubrication under the same oil supply; accordingly, the peak of drag torque will rise. If the flow rate of oil supply is increased, the maximum speed where full oil film lubrication is realized will be higher; consequently, the maximum drag torque will be improved. When clearance becomes wider, the cross-sectional area of the radial flow will be larger, then the maximum speed of full oil film lubrication under the same oil supply will be decreased, thus the peak of drag torque will decline.

scholarly journals Three‐dimensional simulation analysis of microdissection testicular sperm extraction for patients with non‐obstructive azoospermia

Andrology ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 1214-1221
Author(s):  
Kentaro Ichioka ◽  
Yoshiyuki Matsui ◽  
Naoki Terada ◽  
Hiromitsu Negoro ◽  
Takayuki Goto ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Three Dimensional ◽  
Testicular Sperm Extraction ◽  
Obstructive Azoospermia ◽  
Testicular Sperm ◽  
Dimensional Simulation

A novel quasi-3D thermodynamic model of oil film bearing with non-Newtonian and temperature-viscosity effects

2017 ◽  
Vol 69 (5) ◽  
pp. 638-644 ◽  
Author(s):  
Feng Liang ◽  
Quanyong Xu ◽  
Ming Zhou
Keyword(s):  
High Speed ◽  
Numerical Models ◽  
Thermal Analyses ◽  
Three Dimensional ◽  
High Rotational Speed ◽  
Content Type ◽  
Oil Film ◽  
Time Consumption ◽  
Simulation Speed ◽  
Viscosity Effects

Purpose The purpose of this paper is to propose a quasi-three-dimensional (3D) thermohydrodynamic (THD) model for oil film bearings with non-Newtonian and temperature-viscosity effects. Its performance factors, including precision and time consumption, are investigated. Design/methodology/approach Two-dimensional (2D), 3D and quasi-3D numerical models are built. The thermal and mechanical behaviors of two types of oil film bearings are simulated. All the results are compared with solutions of commercial ANSYS CFX. Findings The 2D THD model fails to predict the temperature and pressure field. The results of the quasi-3D THD model coincide well with those of the 3D THD model and CFX at any condition. Compared with the 3D THD model, the quasi-3D THD model can greatly reduce the CPU time consumption, especially at a high rotational speed. Originality/value This quasi-3D THD model is proposed in this paper for the first time. Transient mechanical and thermal analyses of high-speed rotor-bearing system are widely conducted using the traditional 3D THD model; however, the process is very time-consuming. The quasi-3D THD model can be an excellent alternative with high precision and fast simulation speed.

scholarly journals Using Poisson Disk Sampling to Render Oil Particles at Sea

2020 ◽  
Vol 27 (4) ◽  
pp. 31-46
Author(s):  
Vancuong Do ◽  
Hongxiang Ren
Keyword(s):  
Oil Spill ◽  
Oil Spills ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Fluid Simulation ◽  
Oil Film ◽  
Solid Objects ◽  
Marching Cube Algorithm ◽  
Dimensional Simulation ◽  
Oil Particles

Fluid simulation is one of the most complex tasks in three-dimensional simulation. Specifically, in the case of oil spills at sea, the oil film constantly interacts and is influenced by the environment, thus making its composition and properties change over time. In this paper, we tackle this problem by using both Lehr's spreading model and Hoult's drifting model to build the oil spill physical model. Unlike previous studies that only applied the Poisson disk algorithm to static and solid objects, we applied it in a three-dimensional space to divide the oil film into fluid particles. The track of oil particles under the influence of waves, wind, and currents is rendered by the Unity3D tool with C# programming language, which vividly and realistically simulates the collision of oil particles on the ocean scene with obstacles such as buoys and small islands. The result of this research can be used to predict oil spill direction, thus providing the solution to respond and minimize the damage caused by oil spills at sea. We also discuss some improvements to our model by using the Marching cube algorithm to render the Metaball model.

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