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

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

In situ pressure calibration for piston cylinder cells via ruby fluorescence with fiber optics

2007 ◽  
Vol 78 (6) ◽  
pp. 066109 ◽  
Author(s):  
Kazuko Koyama-Nakazawa ◽  
Masahito Koeda ◽  
Masato Hedo ◽  
Yoshiya Uwatoko
Keyword(s):  
Fiber Optics ◽  
Piston Cylinder ◽  
Pressure Calibration

Thermo-elastohydrodynamic simulation of the piston-cylinder contact in high-pressure pumps at 3000 bar

2019 ◽  
Vol 71 (5) ◽  
pp. 702-705
Author(s):  
Ömer Özdemir ◽  
Felix Fischer ◽  
Adrian Rienäcker ◽  
Katharina Schmitz
Keyword(s):  
High Pressure ◽  
Thermal Stresses ◽  
Test Bench ◽  
High Pressures ◽  
Elastohydrodynamic Lubrication ◽  
Simulation Method ◽  
Pressure Effects ◽  
High Pressure Pump ◽  
Content Type ◽  
Piston Cylinder

Purpose The purpose of this paper is to show these effects in an abstracted micro gap test bench. Because of stronger emission laws, the ambition to raise the rail pressure in common-rail systems from the current 2500 bar to 3000 bar is a given. The pressure increase will allow fine atomization of fuel and therefore more efficient combustion. But within the technical system of the high-pressure pump, stronger thermal stresses of the piston–cylinder contact are expected. A pressure drop from such a high level causes high temperature gradients due to energy dissipation. Design/methodology/approach For a detailed examination, the critical piston–cylinder contact has been investigated in an abstracted test bench with a flat parallel gap and an equivalent thermo-elastohydrodynamic simulation model. Findings The simulation results show good accordance to the measurements of pressures, temperatures and leakages for pressures up to 3000 bar. Comparison with elastohydrodynamic lubrication results outlines the need to consider temperature and pressure effects viscosity and solid deformation for the simulation and design of tribological contacts at high pressures. Originality/value This paper describes a simulation method with high accuracy to investigate tribological contacts considering temperature effects on solid structures and the fluid film. The thermo-elastohydrodynamic lubrication simulation method is valid not only for piston–cylinder contacts in high-pressure pumps but also for journal bearings in combustion engines.

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