Study of Pressure Calibration and Pressure Distribution in a Piston‐Cylinder High Pressure Press

1967 ◽  
Vol 38 (8) ◽  
pp. 1009-1018 ◽  
Author(s):  
Masaaki Tamayama ◽  
Henry Eyring
Keyword(s):  
High Pressure ◽  
Pressure Distribution ◽  
Piston Cylinder ◽  
Pressure Calibration

Influence of pressure distribution in the gap of piston-cylinder unit and properties of working fluid PES-3 on characteristics of high pressure piston-cylinder unit

2020 ◽  
pp. 38-42
Author(s):  
A. E. Aslanyan
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Pressure Distribution ◽  
Pressure Range ◽  
Pressure Change ◽  
Working Fluid ◽  
Research Results ◽  
Piston Cylinder ◽  
Pressure Distributions ◽  
The Mathematical Model

A simulation of the use of PES-3 liquid in a high-pressure piston-cylinder units was performed, and the parameters of the piston-cylinder units were determined in the article. The equations of the mathematical model describing the pressure change in the gap between the piston and the cylinder are given. As a result of the calculations, the pressure distributions in the gap between the piston and the cylinder are determined at under piston pressures less than 1.6 GPa. The profiles of the gaps between the deformed piston and cylinder at different under piston pressures are calculated. The dependences of the speed of lowering the piston and the effective gap on the under piston pressure at different gaps of the undeformed piston-cylinder unit are obtained. The research results can be used in the design of piston cylinder units operating on PES-3 liquid in the pressure range of 0.01–1.6 GPa.

Unsymmetrical Friction and Pressure Calibration in Internally‐Heated Piston‐Cylinder Type High‐Pressure Devices

1967 ◽  
Vol 38 (12) ◽  
pp. 1741-1743 ◽  
Author(s):  
Carl W. F. T. Pistorius ◽  
Eliezer Rapoport ◽  
J. B. Clark
Keyword(s):  
High Pressure ◽  
Piston Cylinder ◽  
Pressure Calibration

Research on Sealing Performance in High Pressure Oil-Free Miniature Air Compressor

2017 ◽  
Author(s):  
Yipan Deng ◽  
Yinshui Liu ◽  
Fan Li ◽  
Pengyun Tian ◽  
Na Miao
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Pressure Distribution ◽  
Research Work ◽  
Piston Rings ◽  
Premature Failure ◽  
Air Compressor ◽  
Sealing Performance ◽  
Rotary Speed ◽  
Discharge Pressure

High pressure oil-free miniature air compressor has an irreplaceable role in some high demand areas such as cooling, scuba diving and pneumatic catapult due to its remarkable advantages such as compacted size, lightened weight and clean output gas. As the important sealing component in the high pressure oil-free miniature air compressor, piston rings hold the properties such as tiny diameter (less than 10mm), high sealing pressure (up to 410 bar) and high surrounding temperature (up to 500K), which make them distinctive from conventional piston rings. A mathematical model was established to simulate the pressure distribution of the compressor chamber, as well as the gap between the sealing rings. Sensitive parameters were considered to investigate their effects on the sealing performance such as the number and the cut size of the piston rings, the suction and discharge pressure and the rotary speed. The mathematical model was verified by comparing to published experimental research work. These work help to reveal the severe non-uniformity of the pressure distribution of different chambers, which were suggested be the primary cause of the premature failure of the sealing rings, thus improving the sealing performance and the service life of the air compressor.

Tribological study of piston–cylinder interface of radial piston pump in high-pressure common rail system considering surface topography effect

2019 ◽  
Vol 234 (9) ◽  
pp. 1381-1395 ◽  
Author(s):  
Bo Qi ◽  
Zhang Yong
Keyword(s):  
High Pressure ◽  
Surface Topography ◽  
Tribological Properties ◽  
Reynolds Equation ◽  
Energy Equation ◽  
Common Rail ◽  
Piston Pump ◽  
Common Rail System ◽  
Topography Effect ◽  
Piston Cylinder

Based on the theory of thermal fluid dynamic lubrication, the Reynolds equation and energy equation of the average flow of a piston–cylinder interface of a radial piston pump in a high-pressure common rail system are established, considering the surface topography effect. The tribological properties of the piston–cylinder interface are calculated by solving the Reynolds equation and energy equation. A surface wear model is established and the wear distribution and trend of the piston–cylinder interface are studied. The wear characteristics of the piston–cylinder interface are verified through experiment, and the wear lubrication of the piston–cylinder interface is discussed. The surface topography effect has a considerable influence on the characteristics of the piston–cylinder interface film. Different surface morphologies change the film characteristics of the piston–cylinder interface, yielding different wear behaviors on the mating surface. The wear of the piston–cylinder interface first decreases along the film outlet to the inlet and then rises. The cylinder surface mainly exhibits abrasive, cavitation, and micro-convex scratch wear, whereas the piston surface mainly shows cavitation wear. The results obtained in this study are of considerable significance as they reveal the tribological properties of the piston–cylinder interface under the surface topography effect.

Paper 20: Measurement of Sliding Friction and Wear in High-Temperature High-Pressure Water Environments

1965 ◽  
Vol 180 (11) ◽  
pp. 37-48
Author(s):  
W. H. Roberts
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Piston Cylinder ◽  
Force Transducers ◽  
Nimonic 80A ◽  
New Apparatus ◽  
Pressure Water ◽  
Lubrication Conditions

A new apparatus is described which enables continuous measurement to be made of the friction coefficient between surfaces sliding under boundary lubrication conditions in high-pressure (2700 lb/in2), high-temperature (up to 350°C) water environments. One specimen is held stationary under load against a moving specimen which may be either continuously rotated or reciprocated, linear rubbing speeds being low (of the order of a few centimetres per second). The design of the test section is such that any one of three geometrical configurations of specimen can be selected: piston-cylinder, journal-sleeve, or crossed-cylinders. The friction force transducers which have been developed for this work are described. Friction and wear results are presented for stainless steel (En 58E) sliding against itself, Inconel X, Nimonic 80A, chromium-plate and Deloro SF40, in the temperature range 20°-325°C.

Construction of the new gas meter high pressure calibration facility – Technical and metrological problems

2018 ◽  
Vol 60 ◽  
pp. 57-66 ◽  
Author(s):  
Mateusz Turkowski ◽  
Eliza Dyakowska ◽  
Paweł Szufleński ◽  
Tomasz Jakubiak
Keyword(s):  
High Pressure ◽  
Pressure Calibration ◽  
Calibration Facility
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