scholarly journals Tribological Behavior of Friction Pairs in a High-Pressure Vane Pump under Variable Working Conditions

2021 ◽  
Vol 16 (3) ◽  
pp. 159-169
Author(s):  
Shaonian Li ◽  
Hao Liu ◽  
Yi Li ◽  
Shangling Bao ◽  
Pan Yang
Keyword(s):  
High Pressure ◽  
Working Conditions ◽  
Tribological Behavior ◽  
Vane Pump

scholarly journals INFLUENCE OF ROUGHNESS ON THE TRIBOLOGICAL BEHAVIOR OF A STEEL-STEEL COUPLE LUBRICATED WITH THREAD COMPOUND

2019 ◽  
Vol 49 (3) ◽  
pp. 193-200
Author(s):  
N. A. ZABALA ◽  
P. CASTRO ◽  
Walter TUCKART
Keyword(s):  
Surface Roughness ◽  
High Pressure ◽  
Tribological Behavior ◽  
Normal Load ◽  
Roughness Parameter ◽  
Small Scale ◽  
Contact Conditions ◽  
Threaded Joints ◽  
Copper Zinc ◽  
Wear Damage

The purpose of this study is to determinate the influence of surface roughness on the tribological behavior of a lubricated steel against steel tribosystem. Tests were carried out at high pressure and slow sliding speed, in order to simulate at small scale, the contact conditions found in the seal of the threaded joints used in oil & gas casing and tubing strings. Tests were carried out with a simplified block-onring test, varying the surface roughness of rings between 1.3 to 3 m Ra values. A thread compound lubricant containing lead, copper, zinc and graphite was used. During each cycle of test, the normal load was varied linearly between 250 N and 7000 N. An exponential correlation between Ra and Rt roughness values with the wear damage was found and the wear damage of the blocks decreases about 40 percent with the increasing of initial Ra roughness parameter in the movil surface.

scholarly journals Electromagnetic phenomena analysis in brushless DC motor with speed control using PWM method

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 907-912
Author(s):  
Marek Pawel Ciurys
Keyword(s):  
High Pressure ◽  
Single Phase ◽  
Speed Control ◽  
Dc Motor ◽  
Circuit Model ◽  
Brushless Dc Motor ◽  
Bldc Motor ◽  
Vane Pump ◽  
Brushless Dc

AbstractField-circuit model of a brushless DC motor with speed control using PWM method was developed. Waveforms of electrical and mechanical quantities of the designed motor with a high pressure vane pump built in a rotor of the motor were computed. Analysis of electromagnetic phenomena in the system: single phase AC network – converter - BLDC motor was carried out.

Part Load Conditions of Complex Cycle Power Plants With Intercooled Gas Turbine

1996 ◽  
Author(s):  
A. Peretto
Keyword(s):  
High Pressure ◽  
Gas Turbine ◽  
Working Conditions ◽  
Power Plants ◽  
Pressure Level ◽  
Combined Cycle ◽  
Brayton Cycle ◽  
Part Load ◽  
High Pressure Compressor ◽  
Pressure Compressor

The present paper evaluates the behavior, in design and part load working conditions, of a complex gas turbine cycle with multiple intercooled compression, and the optional preheating of the air at the high pressure compressor outlet by means of the gas turbine outlet hot gas. The results are then compared with those obtained by a Brayton cycle gas turbine, with or without preheating of the air at the high pressure compressor outlet. Subsequently, the performance of complex combined cycles, with intercooled gas turbine as topper and one, two or three pressure level steam cycle as bottomer, in design and part load working conditions is also evaluated. The performance of these complex combined plants is then compared with that obtained by a Brayton cycle gas turbine as topper and one, two or three pressure level steam cycle as bottomer. Part load working conditions are realized by varying either the inlet guide vane angle of the first compressor nozzles or the maximum temperature at the combustor outlet. The study shows that in part load working conditions obtained by varying IGV, the complex cycles, in the examined gas turbine or in the combined cycle power plants, give conversion efficiencies decidedly greater than those obtainable by varying combustor exit temperature. Furthermore it is found that these complex power plant efficiencies, in part load working conditions, are far greater than those obtained by the Brayton cycle gas turbine, or by combined cycle with Brayton cycle gas turbine as topper, if IGV adjustment is adopted. If power variation is obtained with combustor outlet temperature adjustment, the efficiencies of the combined power plants with complex or Brayton cycle gas turbines, are substantially the same, for the same relative power variation.

ALFRED Steam Generator Assessment: Design and Pre-Test Analysis of HERO Experiment

2018 ◽  
Author(s):  
Pierdomenico Lorusso ◽  
Alessio Pesetti ◽  
Mariano Tarantino
Keyword(s):  
High Pressure ◽  
Steam Generator ◽  
Working Conditions ◽  
Test Section ◽  
Tube Bundle ◽  
Secondary System ◽  
Test Analysis ◽  
Pressurized Water ◽  
Pressure Tests ◽  
Secondary Loop

In the framework of the ALFRED design (Advanced Lead Fast Reactor European Demonstrator) for DEMO-LFR, a new concept of steam generator (SG) has been proposed consisting in a double wall bayonet tube bundle which improves the plant safety reducing the possibility of water-lead interaction thanks to a double physical separation between them, and allowing an easier control of eventual leakages from the coolant by pressurizing the separation region with inert gas. In order to support the development of this innovative SG configuration, the ENEA has designed and realized the HERO (Heavy liquid mEtal pRessurized water cOoled tubes) test section, a mock-up (1:1 in length) which represents the ALFRED SG. This test section, implemented in the CIRCE pool facility, aims to investigate on the thermal-hydraulic features of the system, providing a database for STH codes validation. The experimental campaign consists of high pressure tests at about 180 bar carried out in the framework of the HORIZON2020 SESAME project (Simulations and Experiments for the Safety Assessment of MEtal cooled reactors). The secondary loop has been realized for the HERO SG feeding, consisting in an open loop circuit fed by demineralized water. The system is equipped with a volumetric pump and a heater in order to reach the water nominal working conditions of 335°C at the SG inlet and about 180 bar at the outlet. A preliminary test analysis is carried out by RELAP5-3D© thermal-hydraulic system code. A numerical 1-D model of the HERO SG and the secondary loop has been realized in order to test the loop layout and to characterize the main components from a thermal-hydraulic point of view, defining the start-up procedures for the achievement of the working conditions of the water for the high pressure tests. Furthermore, several simulations are carried out to investigate on the secondary system behavior both for steady states and transients.

scholarly journals Research On Calculation Method of Serpentine Pipe Bend

2021 ◽  
Vol 245 ◽  
pp. 01043
Author(s):  
Xuchen Zhu ◽  
Yannan Du ◽  
Bin Ren ◽  
Xiaoying Tang ◽  
Zhigang Yang ◽  
...  
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Working Conditions ◽  
Calculation Method ◽  
Optimization Design ◽  
Structural Characteristics ◽  
Design Methods ◽  
Finite Element Simulations ◽  
Pipe Bend ◽  
The Future

Because of its structural characteristics, the serpentine high-pressure heater has thinner tubesheet compared with the traditional U-tube high-pressure heater, which solves the bottleneck of tubesheet manufacturing and becomes an important auxiliary machine for millions of secondary reheating units in the future. In this paper, the typical working conditions are selected, and the bending design methods of domestic and foreign serpentine tubes are adopted respectively. The results show that compared with Chinese standards, the bending can be thinned. Subsequent tests and finite element simulations verify the reliability of foreign methods and explore the optimization design methods of domestic serpentine tubes.

Effects of Nickel and Chromium Additions on Microstructure of P/M 316L Stainless Steels

2017 ◽  
Vol 891 ◽  
pp. 452-457
Author(s):  
Seksak Asavavisithchai ◽  
Panyawat Wangyao ◽  
Fonthip Tangmon ◽  
Pipat Tangsatapornpad
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Oxidation Resistance ◽  
Working Conditions ◽  
Stainless Steels ◽  
Sintering Temperature ◽  
Optical Microscope ◽  
Hydrogen Atmosphere ◽  
Microstructural Development ◽  
Σ Phase

The present study aims to investigate the effects of Ni and Cr additions on microstructure of P/M 316L stainless steels. The optimum content of both elements to maximize the oxidation resistance of the stainless steel with minimum σ phase formation and microstructural development in various sintering times are also examined. The 316L samples were produced by homogeneously mixing Ni and Cr powders in various contents, followed by cold compaction at high pressure for 30 s. The solutioning process was performed at 1300°C for 45 s under hydrogen atmosphere. The sintering temperature was at 800°C and the sintering times were selected at 200, 400 and 600 hrs, in order to simulate working conditions. The development of microstructure was examined through optical microscope. It is found that the addition of Ni and Cr resulted in the formation of different porosity contents. The porosity increases when the content of the powders increases.

Effect of the Content of Air Bubble in Oil on Forces of Vane in High Pressure Vane Pump

2011 ◽  
Vol 65 ◽  
pp. 17-20
Author(s):  
Shao Nian Li ◽  
Lie Jiang Wei ◽  
Zheng Rong Wang ◽  
Hong Ji
Keyword(s):  
Computer Simulation ◽  
High Pressure ◽  
Elasticity Modulus ◽  
Vane Pump ◽  
Air Bubble ◽  
Variation Curve

The content of air bubble in oil will effect on the value of volume elasticity modulus and the pressure of oil in working cavity of vane pump, and effect on the force of vane. The model between the air bubble content and the oil pressure in sealed working cavity is built when vane moving from big arc area to outlet area. And the equations of vane force in outlet area of vane pump are listed, and the variation curves are obtained by computer simulation when the content of air is given different value. The curve indicated the content of air bubble only effect on the value of vane force in pressure rising area of vane pump. The value of force reduced and the gradient of variation curve increased with the value of the air bubble content increasing.

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