Development of Friction Properties Experimental Device of Mechanical Seal Material in Vacuum Working Condition

2013 ◽  
Vol 572 ◽  
pp. 371-374
Author(s):  
Feng Zhang ◽  
Bao Yu Song ◽  
Jia Peng Sun ◽  
Song Zhang
Keyword(s):  
Atmospheric Pressure ◽  
Working Condition ◽  
Space Exploration ◽  
High Vacuum ◽  
Experimental System ◽  
Mechanical Seal ◽  
Test Rig ◽  
Environment Temperature ◽  
Friction Performance ◽  
Materials Used

Mechanical seal plays a very important role in rotating machinery for space exploration, but it is very difficult to estimate its friction performance by simulative experiment. In this paper, a experimental system for measuring friction properties of mechanical seal materials used in spacecraft is developed. It is able to provide some adjustable parameters in the experiment, such as environment temperature -60°C~60°C, load 100N~300N, rotational speed of 30r/min~110r/min and atmospheric pressure and high vacuum. Friction coefficients of babbitt graphite M120B and hard alloy YG6 are obtained by the test rig and the experimental results testify that the device can conduct simulative experiment effectively.

Development of a Heavy Duty GT Syngas Burner for IGCC Power Plant in Order to Enlarge the GT Operating Conditions

2006 ◽  
Author(s):  
Federico Bonzani ◽  
Paolo Gobbo
Keyword(s):  
Atmospheric Pressure ◽  
Coal Gasification ◽  
Working Condition ◽  
Operating Conditions ◽  
Test Results ◽  
Customer Requirements ◽  
Test Rig ◽  
Gasification Process ◽  
Fuel Flexibility ◽  
Current Design

In order to increase the fuel flexibility of the current design of the SynGas burner [4,5,6], Ansaldo Energia, since the growing requests of the market, performed a R&D financed project to use the SynGas fuel available as the unique fuel to feed the gas turbine. Therefore the new working condition to be fulfilled by the modified SynGas burner are the following: a) ignition; b) acceleration; c) loading at part load; d) change over from diffusion line to main SynGas line. To fulfill with new requirements, the standard V94.2K burners have been modified in order to operate from ignition up to the change over point with a SynGas mixture provided by the coal gasification process of a typical IGCC plant [7]. After the design phase, a experimental test campaign on the new design burner has been performed at atmospheric pressure. In order to validate the test results carried out at actual engine working conditions a further test campaign has been performed at the high pressure consistent with the test rig technical limitations [2.3]. The paper show the results carried out that are really promising to meet the customer requirements.

scholarly journals The influence of pressure on the boiling points of metals

1910 ◽  
Vol 83 (565) ◽  
pp. 483-491 ◽  
Keyword(s):  
Atmospheric Pressure ◽  
Boiling Point ◽  
High Vacuum ◽  
Similar Type ◽  
Exact Relation ◽  
Reduced Pressure ◽  
Boiling Points ◽  
Experimental Values ◽  
Low Pressures ◽  
Very High

Part I. — Pressures below 760 mm . In a previous communication (‘Proc.’, A, vol. 82, 1909, p. 396) the approximate boiling points of a number of metals were determined at atmospheric pressure. Apart from the question of finding the exact relation between the boiling point and pressure, it is an important criterion of any method for fixing the temperatures of ebullition to demonstrate that the experimental values obtained are dependent on the pressure. It is specially desirable when dealing with substances boiling at temperatures above 2000° to have some evidence that the points indicated are true boiling points. Previous work on the vaporisation of metals at different pressures has been confined to experiments in a very high vacuum except for metals like bismuth, cadmium, and zinc, which boil at relatively low temperatures under atmospheric pressure. The observations were limited to very low pressures on account of the difficulty of obtaining any material capable of withstanding a vacuum at temperatures over 1400° and the consequent necessity for keeping the boiling point below this limit by using very low pressures. Moreover in the case of the majority of the metals, e. g. , copper, tin, ebullition under reduced pressure has never been observed. The difficulties indicated above were avoided by using a similar type of apparatus to that previously described, and arranging the whole furnace inside a vacuum enclosure, thus permitting of the use of graphite crucibles to contain the metal.

Effect of pin generatrix on the elastohydrodynamic lubrication performance of pin-bush pair in industrial roller chains

2021 ◽  
pp. 135065012110659
Author(s):  
Ansheng Zhang ◽  
Jing Wang ◽  
Yiming Han ◽  
Jianjun Zhang ◽  
Yi Liu
Keyword(s):  
Film Thickness ◽  
Working Condition ◽  
Elastohydrodynamic Lubrication ◽  
Test Rig ◽  
Stroke Length ◽  
Oil Supply ◽  
Supply Condition ◽  
Lubrication Performance ◽  
Custom Made ◽  
Disk Test

For industrial roller or bush chains, the bush swings relative to the pin at working condition. If proper lubrication is maintained, an elastohydrodynamic lubrication contact is formed between the pin and the bush. In this study, a custom-made pin was used to replace the steel ball of a ball-disk test rig and optical interferometric experiments were carried out to study the effect of pin generatrix on the lubrication performance. The effects of generatrix shape, stroke length and oil supply condition on the lubrication state were explored. It is found that the change of the generatrix has an important influence on the oil film thickness, especially under rare oil supply condition.

Effect of Alternating Pressure of Seawater on Protective Properties of Organic Coating on Steel Substrate

2009 ◽  
Vol 79-82 ◽  
pp. 985-988 ◽  
Author(s):  
Jie Liu ◽  
Xiang Bo Li ◽  
Jia Wang
Keyword(s):  
Atmospheric Pressure ◽  
Synergistic Effects ◽  
Steel Substrate ◽  
Degradation Process ◽  
Organic Coating ◽  
Natural Seawater ◽  
Protective Properties ◽  
Coating Degradation ◽  
Environment Temperature ◽  
Chlorine Ion

In natural seawater environment, temperature and chlorine ion are important factors for organic coating degradation. The alternating pressure of seawater can also affect the lifetime in deep-sea environment and probably is conducive to synergistic effects with other ageing factors. The present work is to investigate the effect of alternating pressure of seawater on protective properties of epoxy organic coating on 907A steel substrate, and evaluates the organic coating degradation process after pressure tests at atmospheric pressure. EIS was used to study the degradation process of the organic coating in natural seawater. The results demonstrated that the impedance of coating under alternating pressure of seawater conditions decreased faster than that at atmospheric pressure. With the increase of alternating pressure cycles, the entire degradation process of organic coating was accelerated. It is concluded that alternating pressure of seawater has to be considered as an aggressive factor like temperature or chlorine ion.

Chemical Reactions at the in Vacuo Au/Inp Interface

1986 ◽  
Vol 83 ◽  
Author(s):  
R. Stanley Williams ◽  
C. Thomas Tsai ◽  
Eun-Hee Cirlin
Keyword(s):  
Intermetallic Compound ◽  
Atmospheric Pressure ◽  
High Vacuum ◽  
Thermodynamic System ◽  
External Pressure ◽  
Ultra High Vacuum ◽  
Reaction Products ◽  
Inp Substrate ◽  
Major Reaction ◽  
Closed Thermodynamic System

ABSTRACTThe reaction between a Au film and an Inp substrate occurs much more readily in vacuo than under an external pressure of an inert ga. At atmospheric pressure, the compounds Au2P3 and the γ intermetallic compound (at times designated Au7In3, Au9In4, or Au2In) are formed at 450 °C and remain fairly stable even when annealed at 500°C for hours. Under ultra-high vacuum conditions, phosphorous readily escapes from the film when a sample is annealed at 300°C for 15 minutes, and the major reaction products are the ψ phase (Au3In2) and another intermetallic compound that is probably AuIn. The presence of an inert gas creates a kinetic barrier for the escape of phosphorous from the surface, and thus Au/InP behaves more like a closed thermodynamic system under pressure than in a vacuum.

Researches on Friction Performance of Water-Lubricated Polymer Composite Journal Bearings Based on Experiments

2014 ◽  
Vol 711 ◽  
pp. 57-60
Author(s):  
Geng Yuan Gao ◽  
Zhong Wei Yin ◽  
Dan Jiang ◽  
Xiu Li Zhang
Keyword(s):  
Carbon Fiber ◽  
Polymer Composite ◽  
Journal Bearing ◽  
Hydrodynamic Lubrication ◽  
Journal Bearings ◽  
Test Rig ◽  
Friction Performance ◽  
Steel Sleeve ◽  
Almost All ◽  
The Given

A composite which is PTFE as a matrix with PEEK and carbon fiber as fillers is developed to fabricate the bush of water-lubricated journal bearings. The bush is fabricated with a new structure that a relatively large straight groove is opened in its upper part. A water-lubricated journal bearing made up of the bush and a steel sleeve is studied using purposed-built test rig. It is shown that the test bearing operates under hydrodynamic lubrication for almost all of the given conditions. The composite developed in the work is a promising material for water-lubricated journal bearings, and the new structure can be well used in water-lubricated journal bearings.

Physical Modeling and Data Analysis of the Dynamic Response of a Flexibly Mounted Rotor Mechanical Seal

1995 ◽  
Vol 117 (1) ◽  
pp. 130-135 ◽  
Author(s):  
An Sung Lee ◽  
Itzhak Green
Keyword(s):  
Data Analysis ◽  
Dynamic Behavior ◽  
Theoretical Work ◽  
Experimental Investigations ◽  
Mechanical Seal ◽  
Test Rig ◽  
The Past ◽  
Recent Theoretical Work ◽  
Face Seals ◽  
Stiffness And Damping

The dynamic behavior of mechanical face seals has been an active area of research over the past three decades. Analytical and experimental investigations have exclusively been devoted to the flexibly mounted stator (FMS) seal. Recent theoretical work on the dynamics of the noncontacting flexibly mounted rotor (FMR) seal has proven that it excels in every aspect of dynamic behavior compared to the FMS seal. The advantages of the FMR seal, however, have to be experimentally verified. This work introduces a physical model (i.e., test rig) for an experimental investigation of the dynamic behavior of a noncontacting FMR seal. Features of the test rig, a new method of modeling and measuring the stiffness and damping of elastomeric O-ring secondary seals, and data analysis procedures will be introduced. Finally, experimental results will be compared with theory.

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