No-Contact Hydraulic Dynamic Seal Characteristic Study Base on CFD

2013 ◽  
Vol 274 ◽  
pp. 612-615 ◽  
Author(s):  
G.B. Yu ◽  
B. Dai ◽  
L. Huang ◽  
J.F. Nie ◽  
Y. Zhao
Keyword(s):  
Engineering Design ◽  
Surface Quality ◽  
Pressure Difference ◽  
Hydraulic Systems ◽  
Cfd Model ◽  
Eccentricity Ratio ◽  
Sealing Performance ◽  
Small Clearance ◽  
Dynamic Seal ◽  
Study Base

Non-contact hydraulic seal (clearance seal) reduce the leakage by the small clearance between the seal. Non-contact hydraulic seal is the simplest form of a seal. The sealing effect depends on the size of the clearance and pressure difference, the length and parts of the sealing surface quality. Among them, the clearance size of the greatest impact on the sealing performance. The hydraulic systems sealing mathematical and CFD model are built in this paper. Studies have shown that eccentricity ratio, seal clearance and pressure are has impact to hydraulic force and leakage. It should be considered in the engineering design.

scholarly journals Design and seal performance analysis of bionic sealing ring for dynamic seal

Mechanika ◽  
2020 ◽  
Vol 26 (4) ◽  
pp. 338-345
Author(s):  
Yang HU ◽  
Jie ZHANG ◽  
Li Ming CHEN
Keyword(s):  
Friction Coefficient ◽  
Smooth Surface ◽  
Fluid Pressure ◽  
Rotating Machinery ◽  
Two Dimensional ◽  
Hydraulic Systems ◽  
Sealing Performance ◽  
Sealing Ring ◽  
Dynamic Seal ◽  
Better Than

In this paper, the non-smooth surface technology is applied to the surface structure of the rectangular sealing ring, and a bionic sealing ring is designed. Two-dimensional axisymmetric models of rectangular and bionic sealing rings were established. Effects of pre-compression amount, fluid pressure, friction coefficient and reciprocating velocity on the static and dynamic sealing performance of two sealing rings were studied. The results show that the seal performance of the bionic sealing ring is greater than that of rectangular. The static seal performance increases with the increasing of fluid pressure and compression amount. Dynamic sealing performance in outward stroke is better than it in the inward stroke. Friction coefficient has a smaller effect on the bionic sealing ring’s sealing performance than rectangular sealing ring. Therefore, using the bionic sealing ring can improve the static and dynamic seal performances and prolong its service life in hydraulic systems, rotating machinery and reciprocating machinery.

scholarly journals Structural Design and Sealing Performance Analysis of Biomimetic Sealing Ring

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Chuanjun Han ◽  
Han Zhang ◽  
Jie Zhang
Keyword(s):  
Friction Coefficient ◽  
Contact Stress ◽  
Von Mises Stress ◽  
Stress Increase ◽  
Medium Pressure ◽  
Sealing Performance ◽  
Sealing Ring ◽  
Hardness Increase ◽  
Dynamic Seal ◽  
Von Mises

In order to reduce the failure probability of rubber sealing rings in reciprocating dynamic seal, a new structure of sealing ring based on bionics was designed. The biomimetic ring has three concave ridges and convex bulges on each side which are very similar to earthworms. Bulges were circularly designed and sealing performances of the biomimetic ring in both static seal and dynamic seal were simulated by FEM. In addition, effects of precompression, medium pressure, speed, friction coefficient, and material parameters on sealing performances were discussed. The results show that von Mises stress of the biomimetic sealing ring distributed symmetrically in no-pressure static sealing. The maximum von Mises stress appears on the second bulge of the inner side. High contact stress concentrates on left bulges. Von Mises stress distribution becomes uneven under medium pressure. Both von Mises stress and contact stress increase when precompression, medium pressure, and rubber hardness increase in static sealing. Biomimetic ring can avoid rolling and distortion in reciprocating dynamic seal, and its working life is much longer than O-ring and rectangular ring. The maximum von Mises stress and contact stress increase with the precompression, medium pressure, rubber hardness, and friction coefficient in reciprocating dynamic seal.

Determination of the Dynamic Characteristics of a Hydraulic Reservoir for its Air Release Efficiency Using Multiphase CFD Model

2018 ◽  
Author(s):  
Rahelehsadat Mostafavi ◽  
Dominic Tiffin ◽  
Katharina Schmitz
Keyword(s):  
Hydraulic Systems ◽  
Cfd Model ◽  
Lagrangian Particle Tracking ◽  
Flow Conditions ◽  
Lagrangian Particle ◽  
Air Content ◽  
Oil Flow ◽  
Key Variables ◽  
Multiphase Cfd

Undissolved air in oil causes various problems for hydraulic systems and strongly decreases the efficiency of the system. In this respect, the hydraulic reservoir as the only component that performs the function of releasing the accumulated air from the system is relevant. In recent years, the air release efficiency in hydraulic reservoirs has been studied both experimentally and in simulation. However, in none of the according studies dynamically changing flow conditions have been considered. In this paper, the air release behaviour of a hydraulic reservoir is investigated through simulation, considering the dynamics of the system. The developed multiphase CFD model utilizes the open-source CFD tool, OpenFOAM®, based on a Lagrangian Particle Tracking (LPT) within an Eulerian phase. The simulations have been conducted varying the key variables such as oil flow rate and air load at the inlet of the reservoir and yield the air content at the outlet.

Sealing Performance Analysis of Cap Seal Rings in the Stirling Engine Piston Rod

2014 ◽  
Vol 697 ◽  
pp. 206-209
Author(s):  
Jun Chang
Keyword(s):  
High Speed ◽  
Friction And Wear ◽  
Stirling Engine ◽  
Reciprocating Motion ◽  
Working Environments ◽  
Engine Piston ◽  
Sealing Performance ◽  
Working Medium ◽  
Sealing Ring ◽  
Dynamic Seal

When the Stirling engine piston rod for reciprocating motion at a high speed under dry friction conditions, the temperature fall or pressure drop is mainly caused by uneven sealing ring deformation, increased wear and sealing performance fall. This article is introduced a cap seal rings of Stirling engine piston, study for friction and wear in theory under dynamic seal condition, and establish a rod seal test equipment to analysis the cap seal structure distortion and gauge wear in different working environments by experimental methods. Finally, come to the conclusion that when working medium pressure at 7 mpa, the cap seal performance is best.Keywords: Rod seal; cap seal structure; stress analysis

Analysis of Vane Hydraulic Damp Dynamic Seal Mechanism and Performance Influencing Factors

2012 ◽  
Vol 530 ◽  
pp. 130-133 ◽  
Author(s):  
Wen Rui Wang ◽  
Xiao Qiang Yan ◽  
Zhi Hui Sun ◽  
Qi Jiang
Keyword(s):  
Design Optimization ◽  
Nonlinear Material ◽  
Performance Study ◽  
Element Analysis ◽  
Theoretical Simulation ◽  
Seal Design ◽  
Sealing Performance ◽  
Dynamic Seal ◽  
And Performance ◽  
Optimization And Performance

In this paper, the force, deformation and other factors of vane hydraulic damp dynamic seal are researched, which is used of theoretical, simulation about the lip seals sealing damping performance factors. In order to improve sealing performance vane hydraulic damp life, dynamic lip seal design, optimization and performance study is to provide the basis for the theory and engineering applications. The factors influencing sealing performance are considered, such as initial compressibility, sealing sping stiffness. The finite element analysis method can be effectively used to solve nonlinear material and sealing failure problem for the seal design, optimization and performance analysis, which provide a new approach and theoretical guidance to the rubber seal research.

Prediction of the Fluid Induced Instability Force of an Axial Compressor

2006 ◽  
Author(s):  
Young-Seok Kang ◽  
Shin-Hyoung Kang
Keyword(s):  
High Pressure ◽  
Pressure Difference ◽  
Pressure Field ◽  
Axial Compressor ◽  
Tip Clearance ◽  
Flow Coefficient ◽  
Dominant Term ◽  
Blade Loading ◽  
Small Clearance ◽  
Upstream Pressure

Numerical calculations of a rotor row of a low speed axial compressor with an asymmetric tip clearance distribution were carried out. Asymmetric tip clearance induces blade loading and downstream pressure redistribution along the circumferential direction while upstream pressure field is maintained. At small flow coefficients, blade loading redistribution patterns are highly affected by upper 50% blade span region. High pressure difference at the small clearance region causes high blade loading at the small clearance region. On the other hand, at a high flow coefficient, blade loading redistribution is almost coincident with the asymmetric tip clearance distribution. In contrast to lower flow coefficients, the contribution of the lower 50% blade span region increases. A higher axial velocity induces a higher axial momentum, which delivers the upstream pressure field downstream without any circumferential redistribution. Blade loading redistribution due to increased axial momentum overcomes the redistribution caused by local tip clearance performance due to high pressure difference at the small clearance and becomes the dominant term of blade loading redistribution. As a result, the redistributed blade loading synchronizes with the tip clearance distribution and the strength of the blade loading redistribution increases as the flow coefficient increases.

Investigation of Static and Dynamic Seal Performances of a Rubber O-Ring

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Jie Zhang ◽  
Jingxuan Xie
Keyword(s):  
Friction Coefficient ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Failure Modes ◽  
Fluid Pressure ◽  
Friction Torque ◽  
Reciprocating Motion ◽  
Sealing Performance ◽  
Dynamic Seal ◽  
Better Than

Rubber O-rings are widely applied in the static and dynamic seals of machinery, energy, chemical, aviation, and other fields. Mechanical behavior and sealing performance of the O-ring were investigated in this paper. Effects of precompression amount, fluid pressure, friction coefficient on the static and dynamic sealing performances of the O-ring were studied. The results show that the maximum stress appears on the inside but not surface of the O-ring. The static sealing performance increases with the increasing of fluid pressure and compression amount. Reciprocating dynamic sealing performance of the rubber O-ring is different with its static sealing performance; the stress distribution and deformation are changing in reciprocating motion. Sealing performance in outward stroke is better than it in the inward stroke. Overturn of the O-ring occurs when the friction torque is greater than the torque that caused by fluid pressure in the inward stroke. Distortion, bitten, and fatigue failure are the main failure modes of the O-ring in the dynamic seal. Those results can be used in design, installation, and operation of rubber O-rings in static and dynamic seals.

The Variable Cross-Section Rotary Dynamic Seal and its Application

2015 ◽  
Vol 741 ◽  
pp. 95-98
Author(s):  
Long Qing Zou ◽  
Xiao Jing Yuan ◽  
Xue Xin Chen
Keyword(s):  
High Pressure ◽  
Research And Development ◽  
Cross Section ◽  
Simple Structure ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Sealing Performance ◽  
Mechanism Research ◽  
Sealing Mechanism ◽  
Dynamic Seal

This paper mainly introduces the variable cross-section rotary dynamic seal, sealing mechanism, research and development, listing examples of variable cross-section rotary dynamic seal applied in the petroleum machinery. Due to its simple structure, reliable sealing performance, it is widely applied to the occasions such as high pressure, in suffering much, shock vibration.

Numerical and Experimental Study on Combined Seals With the Consideration of Stretching Effects

2020 ◽  
Vol 143 (6) ◽  
Author(s):  
Chao Peng ◽  
Xiaoping Ouyang ◽  
Katharina Schmitz ◽  
Shengrong Guo ◽  
Huayong Yang
Keyword(s):  
Experimental Data ◽  
Hydraulic Systems ◽  
Interference Fit ◽  
Sealing Performance ◽  
Standard Geometry ◽  
Sealing Zone ◽  
Axisymmetric Modeling ◽  
Stretching Ratio ◽  
First Time ◽  
Sealing Elements

Abstract Combined seals, as a kind of reciprocating seals, are widely used in hydraulic systems. The combined seal usually contains two or more elements to achieve the sealing function. Not only the interference fit between the seal and the rod/groove should be considered, but the assembling parameters between the inner sealing elements are also essential to be investigated. Stretching ratio, as an indicator for the interference fit, usually exerts a significant influence on the sealing performance. However, in the studies of stretching effects on combined seals, the traditional axisymmetric modeling method will introduce the overstretching problems, resulting in large errors. To overcome this problem, this paper proposed a putter-movement method, where an extra putter is introduced into the model, and a mixed-lubrication theory was employed to study macro and micro characteristics among the sealing zone. As a typical kind of combined seals, the VL seal is utilized as the research object, and the material’s plastic effects are included in the reciprocating-seal modeling for the first time. The numerical results are compared with the experimental data, and good agreements are obtained. The proposed method is then employed to discuss the sealing characteristics under different interference-fit conditions systematically. The results indicate that the stretching mainly affects the contact pressure on the cavity side. Compared to the performance of the seal with the standard geometry, in the extra-stretching condition, the leakage is increased, but the friction is decreased.

Sign in / Sign up

Export Citation Format

Share Document