High Pressure Control in Synthetic Experimental System of Gas Hydrates Simulation

2009 ◽  
Author(s):  
Fulong Ning ◽  
Ling Zhang ◽  
Guosheng Jiang ◽  
Bing Li ◽  
Jian'an Guan
Keyword(s):  
High Pressure ◽  
Gas Hydrates ◽  
Experimental System ◽  
Pressure Control

Experimental Simulation of Piston Leakage in an Axial Piston Pump

2005 ◽  
Author(s):  
Zeliang Li ◽  
Richard Burton ◽  
Peter Nikiforuk
Keyword(s):  
High Pressure ◽  
Experimental System ◽  
Pressure Control ◽  
Piston Pump ◽  
Experimental Simulation ◽  
Axial Piston Pump ◽  
Very High Frequency ◽  
High Frequency Response ◽  
Pressure Discharge ◽  
Axial Piston

A method used to introduce “artificial leakage” into an axial piston pump to simulate leakage from a worn piston is described in this paper. A pressure control servo valve with a very high frequency response was employed to divert flow from the pump outlet in a prescribed waveform directly to tank. The purpose was to simulate piston leakage from the high pressure discharge chamber to the pump case drain chamber as the “simulated worn piston” made contact with the high pressure chamber. The system and associated control algorithms mimiced the action of a single worn piston at various degrees of wear. The experimental results indicated that the experimental system could successfully introduce artificial leakage into the pump which was consistent with a unit with a “real” worn piston. Comparisons of the pressure ripples from an actual faulty pump (with one worn piston) and the artificial faulty pump (with one simulated worn piston) are presented.

The Experimental Investigation of Steam Condensation With Non-Condensable Gas Under Natural Convection

2018 ◽  
Author(s):  
Xizhen Ma ◽  
Wen Fu ◽  
Haijun Jia ◽  
Peiyue Li ◽  
Jun Li
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
High Pressure ◽  
Natural Convection ◽  
Heat And Mass Transfer ◽  
Vertical Wall ◽  
Experimental System ◽  
Steam Condensation ◽  
Transfer Coefficients ◽  
Calculation Results

The non-condensable gas is used to keep the pressure stable in the steam-gas pressurizer. The processes of heat and mass transfer during steam condensation in the presence of non-condensable gas play an important role and the thermal hydraulic characteristics in the pressurizer is particularly complicated due to the non-condensable gas. The effects of non-condensable gas on the process of heat and mass transfer during steam condensation were experimental investigated. A steam condensation experimental system under high pressure and natural convection was built and nitrogen was chosen in the experiments. The steam and nitrogen were considered in thermal equilibrium and shared the same temperature in the vessel under natural convection. In the experiments, the factors, for instance, pressure, mass fraction of nitrogen, subcooling of wall and the distribution of nitrogen in the steam, had been taken into account. The rate of heat transfer of steam condensation on the vertical wall with nitrogen was obtained and the heat transfer coefficients were also calculated. The characteristics curve of heat and mass transfer during steam condensation with non-condensable gas under high pressure were obtained and an empirical correlation was introduced to calculated to heat transfer coefficient of steam condensation with nitrogen which the calculation results showed great agreement with the experimental data.

Fully predictive Common Rail fuel injection apparatus model and its application to global system dynamics analyses

2016 ◽  
Vol 18 (3) ◽  
pp. 273-290 ◽  
Author(s):  
Alessandro Ferrari ◽  
Pietro Pizzo
Keyword(s):  
High Pressure ◽  
Control System ◽  
Fuel Injection ◽  
Time History ◽  
Pressure Control ◽  
Rail Pressure ◽  
High Pressure Pump ◽  
Pressure Time ◽  
Pressure Control System ◽  
Injection Apparatus

A fully predictive model of a Common Rail fuel injection apparatus, which includes a detailed simulation of rail, pump, piping system, injectors and rail pressure control system, is presented and discussed. The high-pressure pump and injector sub-models have been validated separately and then coupled to the rail and pressure control system sub-models. The complete predictive model has been validated and applied to investigate the effects of the dynamics of each component of the injection apparatus on the rail pressure time history. Variable timing of the high-pressure pump delivery phases has also been considered, and the influence of this parameter on the injection performance has been analysed for both single- and multiple-injection events. Furthermore, the injection system dynamics during the transients between steady-state working conditions has been investigated in order to highlight the role played by the dynamic response of the pressure control system on the rail pressure time history.

Experimental Research of Impinging Spray with Basic Impinging Scheme

2013 ◽  
Vol 281 ◽  
pp. 351-354
Author(s):  
Lei Chen ◽  
Peng Song ◽  
Guo Kai Xu ◽  
Bao Guo Du ◽  
Wu Qiang Long
Keyword(s):  
High Pressure ◽  
Control System ◽  
Experimental System ◽  
Supply System ◽  
Distribution Area ◽  
Light Path ◽  
Path System ◽  
Visualization Experiments ◽  
And Control ◽  
Image Collection

Visualization experimental system of impinging spray including high-pressure vessel, oil supply system, light path system, image collection and treatment system and control system was designed, and the visualization experiments of basic impinging schemes of flat wall was carried out under existing conditions without laser. The effect of impinging distance on rebounding distance and diffusing area of dripping was analyzed. The results show that both of diffusing distance along the wall and distribution area linearly increased within a certain time under the same impinging distance. Both of diffusing distance along the wall and rebounding distance decreased with the increase in impinging distance.

Design and analysis of a high pressure and high temperature sulfuric acid experimental system

2012 ◽  
Vol 251 ◽  
pp. 157-163 ◽  
Author(s):  
Sung-Deok Hong ◽  
Chan-Soo Kim ◽  
Yong-Wan Kim ◽  
Dong-Un Seo ◽  
Goon-Cherl Park
Keyword(s):  
High Pressure ◽  
Sulfuric Acid ◽  
High Temperature ◽  
Experimental System

Experimental Study of the Processes of Gas-Steam Pressurizer Insurge Transients

2020 ◽  
Author(s):  
Wang Bolong ◽  
Li Weihua ◽  
Jia Haijun ◽  
Li Jun ◽  
Hao Wentao
Keyword(s):  
Water Vapor ◽  
Liquid Phase ◽  
Nuclear Reactor ◽  
Influence Factors ◽  
Temperature Response ◽  
Experimental System ◽  
Pressure Control ◽  
Phase Region ◽  
Pressure Response ◽  
System Pressure

Abstract Small reactors have received more and more attention for their high safety, reliability, low power density, and short construction period. And the gas-steam pressurizer is widely used in small reactors due to its characteristics of simple structure, saves the heating and spray equipment, and prevents the coolant from boiling. The gas-steam pressurizer is a pressure control equipment for the reactor coolant system, and its characteristic of transient response is an important factor that affect operation stability of nuclear reactor systems. An experimental system was established to study the effect of pressure response for an insurge transient and influence factors were analyzed quantitatively. Experimental investigation shows that for the gas-steam pressurizer, the increase of coolant loading capacity (insurge) can cause system pressure rising. And the change of system pressure has much consistency with the change of liquid level and gas space temperature. The liquid phase exists temperature fluctuations and overall shows a downward trend during the insurge transient. And there exists a temperature gradient from bottom to top in the pressurizer liquid phase region during the insurge transient. The change of water vapor quantity curve is the oscillating curve during the transient and water vapor quantity is in a decreasing trend overall during the insurge transient. What’s more, the experiments also analyzed the pressure response and temperature response during the insurge transient.

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