Analysis of Fluid Flow in the Sealing Gap of Radial Shaft Seals and Elastic Deformation of the Sealing Surface

2021 ◽  
pp. 1-19
Author(s):  
Markus Schulz ◽  
Marius Hagmayer ◽  
Matthias Baumann ◽  
Frank Bauer
Keyword(s):  
Fluid Flow ◽  
Elastic Deformation ◽  
Research Methodology ◽  
Test Procedure ◽  
Shaft Seal ◽  
Rotation Direction ◽  
Testing Facility ◽  
Shaft Seals ◽  
Evaluation Matrix ◽  
Sealing Gap

Abstract The function of a radial shaft seal bases on interactions between the sealing edge and the shaft counterface. To better understand these mechanisms, a look inside the sealing contact was taken. The procedure and the testing facility are presented in this paper. In addition, a research methodology was developed, to systematically analyse the fluid flow and the distortion of the sealing surface of shaft seals. The results of the test procedure are documented in an evaluation matrix that allows the comparison of sealing systems with different worn sealing edges. For example, the tests show an influence of the rotation direction of the shaft during running-in on the formation of leakage channels or oil collecting chambers within the sealing contact.

Research on sealing performance of oil seals with micro-dimple texture on lips

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fuying Zhang ◽  
Yuanhao Zhang
Keyword(s):  
Peer Review ◽  
Surface Texture ◽  
Elastohydrodynamic Lubrication ◽  
Friction Torque ◽  
Pumping Rate ◽  
Content Type ◽  
Rotation Direction ◽  
Sealing Performance ◽  
Pumping Efficiency ◽  
Shaft Seals

Purpose The purpose of this paper is to study the pumping efficiency of oil seals with different surface textures at different speeds, and the influence of the rotation direction of triangular texture on the sealing performance was further analyzed. Design/methodology/approach Based on the theory of elastohydrodynamic lubrication and the pumping mechanism of rotary shaft seals, establishing a numerical model of mixed lubrication in oil seal sealing area. The model is coupled with the lip surface texture parameters and the two-dimensional average Reynolds equation considering the surface roughness. Findings The results show that the application of lip surface texture technology has obvious influence on the oil film thickness, friction torque and pumping rate of oil seal. The triangular texture has the most significant effect on the increase of pump suction rate. When the rotation direction of triangular texture is 315 degrees, the pumping rate of oil seal is the largest compared with the other seven directions. Originality/value The model has a comprehensive theoretical guidance for the design of new oil seal products, which provides a certain basis for the application of surface texture technology in the field of sealing in the future. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-06-2020-0198/

A Coupled Approach for Modelling Rolling Contact Fatigue Cracks Under Elastohydrodynamic Lubrication

2009 ◽  
Author(s):  
R. Balcombe ◽  
M. T. Fowell ◽  
A. V. Olver ◽  
D. Dini
Keyword(s):  
Fluid Flow ◽  
Elastic Deformation ◽  
Contact Area ◽  
Fatigue Cracks ◽  
Moving Load ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Elastohydrodynamic Lubrication ◽  
Rolling Contact ◽  
Fluid Solid Interaction

In this paper we present a coupled method for modelling fluid-solid interaction within a crack generated in rolling contact fatigue (RCF) in the presence of lubrication. The technique describes the fluid flow in the contact area and within the crack and explores how this affects the elastic deformation of the solid while the moving load traverses the cracked region. It is argued that this approach sheds light on the instantaneous response of the system, therefore providing a more physically-accurate description of the phenomenon under investigation.

scholarly journals A new efficient free-rolling tyre-testing procedure for the parameterisation of vehicle dynamics tyre models

2016 ◽  
Vol 231 (10) ◽  
pp. 1435-1448 ◽  
Author(s):  
Gregory Smith ◽  
Mike Blundell
Keyword(s):  
Vehicle Dynamics ◽  
Test Procedure ◽  
Testing Procedure ◽  
Measurement Procedure ◽  
Model Parameters ◽  
Tyre Model ◽  
Testing Facility ◽  
Measurement Protocol ◽  
The Usa ◽  
Logic Approach

This paper describes an efficient tyre test procedure that can be used to collect the data required to parameterise empirical tyre models used in the computer simulations of vehicle dynamics. The new GS2MF FreeRolling test procedure develops established methodologies, such as the time measurement procedure from the TIME project and the MICH2MF measurement protocol developed as alternatives to traditional square matrix testing. The new process is designed to reduce the number of expensive tyre tests without compromising the accuracy of the generated tyre model parameters. The process is demonstrated by a programme of tyre testing carried out using the Calspan TIRF tyre testing facility in the USA, and it is shown here how the GS2MF Flat-Trac® tyre test procedure can be used more efficiently to parameterise the pure lateral and self-aligning moment components for the well-known ‘magic formula’ tyre model. This is achieved using a ‘cruise’-type procedure which is more representative of conditions existing when driving a real vehicle. During the tests, a novel automated logic approach is also proposed to manage the temperature of the tyres. Finally, graph sweeps are introduced at the start and the end of the tests, allowing a judgement to be made as to the influence of the tyre wear on the data obtained throughout the tests. The development of accurate and representative tyre models remains a significant challenge as vehicle manufacturers target increased use of virtual prototypes and simulations. This work contributes to this challenge by improving the efficiency of the expensive testing process needed to parameterise the models.

scholarly journals Multi-stage magnetic-fluid seals for operating in water – life test procedure, test stand and research results

2013 ◽  
Vol 20 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Leszek Matuszewski
Keyword(s):  
Magnetic Fluid ◽  
Test Procedure ◽  
Limited Range ◽  
Motion Velocity ◽  
Rotating Shaft ◽  
Limited Range Of Motion ◽  
Multi Stage ◽  
Additional Control ◽  
Shaft Seals ◽  
Repeated Test

AbstractThe edge criteria for magnetic-fluid seals durability research were described in previous article [24] and now the tests results are presented. The tests were made with three magnetic fluids using various magnets quantity in magnetic assemblies. If values obtained in the repeated test deviated by more than 10 % from results of the first test an additional control test was made for final characteristics. The characteristics are: critical pressure, critical motion velocity and working life of the seal. The test stands were prepared for particular seals dimensions and results of tests are presented in the form of tables, cross section draws and diagrams. In conclusion one can see that multi-stage magnetic-fluid seals could be efficiently used in water for rotating shaft seals in a limited range of motion velocity and cycles quantity. Nevertheless a particular applications can be provided by magnetic-fluid seals only.

Advanced Screw Pumps for Heavy Fuel Oil Conditioning Systems

2003 ◽  
Author(s):  
Christoph K. Schneider ◽  
Hans-J. Naucke ◽  
Ju¨rgen M. Wolf
Keyword(s):  
State Of The Art ◽  
Magnetic Coupling ◽  
Systematic Investigation ◽  
Fuel Oil ◽  
Shaft Seal ◽  
Heavy Fuel Oil ◽  
Marine Fuel ◽  
Counter Measures ◽  
Current State ◽  
Shaft Seals

Failures of screw pumps in marine fuel oil conditioning systems are some of the most frequent incidents affecting a ship’s availability. In order to identify the possible reasons a systematic investigation was initiated. The result makes obvious that most of the defects are related to shaft seal failures. The respective scenarios of seal defects are discussed in detail as well as possible counter measures. However, the results finally have revealed that pump designs with mechanical shaft seals will always incur a distinct risk of breakdown. A decisive step forward in solving this problem is to completely avoid the shaft seal. The alternative technology of hermetically sealed pumps with magnetic coupling will be presented in its current state of the art.

Fluid Flow and Heat Transfer Prediction of a Rotating Tapered Inclined Channel

2008 ◽  
Author(s):  
Mehaboob Basha ◽  
Luai M. Al-Hadhrami
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Fluid Flow ◽  
Density Ratio ◽  
Three Dimensional ◽  
Temperature Fields ◽  
Inclined Channel ◽  
Rotation Direction ◽  
Flow And Heat Transfer ◽  
Density Ratios

Fluid flow and heat transfer prediction were conducted to study the three dimensional turbulent flow and heat transfer in rotating tapered inclined channel. Channel orientation is 135° from the rotation direction. Three rotation numbers Ro = 0, 0.1, 0.2 & 0.4 and two inlet coolant-to-wall density ratios 0.1 and 0.40 were investigated, respectively, while keeping Reynolds number constant at 10000. The normalized velocity and temperature fields are presented at two axial locations. The local normalized Nusselt number and spanwise averaged Nusselt number values were reported for three walls; leading, trailing, and top walls. The results show considerable span-wise local Nusselt number variation across the leading, trailing and top walls as the rotation number and density ratio increases.

scholarly journals EFFECT OF ELASTIC DEFORMATION ON NANO-SECOND GRADE FLUID FLOW OVER A STRETCHING SURFACE

2018 ◽  
Vol 10 ◽  
Author(s):  
A.K. Abdul Hakeem ◽  
R. Kalaivanan ◽  
B. Ganga ◽  
N. Vishnu Ganesh
Keyword(s):  
Fluid Flow ◽  
Elastic Deformation ◽  
Second Grade ◽  
Second Grade Fluid ◽  
Stretching Surface ◽  
Grade Fluid

An Analysis of Self-Energized Hydrostatic Shaft Seals

1969 ◽  
Vol 91 (4) ◽  
pp. 658-667 ◽  
Author(s):  
M. L. Adams ◽  
R. J. Colsher
Keyword(s):  
Incompressible Fluid ◽  
Laminar Regime ◽  
Sample Problem ◽  
Shaft Seal ◽  
Maximum Stiffness ◽  
Shaft Seals ◽  
Orifice Size

An analysis of a self-energized hydrostatic shaft seal operating with incompressible fluid in the laminar regime is presented. Dimensionless results are optimized for maximum stiffness. Comparisons are made between full annulus and sectored annulus recess configurations. It is shown that translational and torsional stiffnesses are critically dependent upon orifice size. A sample problem is included to demonstrate use of equations, design curves and criteria developed.

Sign in / Sign up

Export Citation Format

Share Document