Experimental Investigation and Numerical Simulation of Gas Ejector in a Combustor With Combustion Gases Recirculation

2003 ◽  
Author(s):  
Kumpeng Zhang ◽  
Fei Xue ◽  
Weiming Pan ◽  
Zhihua Fan
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
High Pressure ◽  
Area Ratio ◽  
Gas Pressure ◽  
Pressure Condition ◽  
Combustion Gases ◽  
Ejection Coefficient ◽  
Pressure Changes ◽  
The Relationship

Sets of high-pressure ejection experiment were conducted to investigate the implementing of gases ejector with high-pressure condition. Numerical simulation was used to extend the study and overcome the limit of experiment facilities. Experiment shows that ejection coefficient of gases ejector was not sensitive to supply gas pressure changes. But which was affected greatly by backpressure in mixing cavity of ejector, as shown by simulation. The simulation result also implies that there are inherent relation between ejection coefficient, area ratio at inlet of mixing cavity and pressure different between supply gas pressure and the backpressure. And the relationship determines that in some range, the implementing of gas ejector was unstable.

scholarly journals Numerical Simulation of Borehole Parameters for Coal Seam Gas Pre-Drainage

2021 ◽  
Vol 39 (4) ◽  
pp. 1328-1334
Author(s):  
Xiaoyan Li ◽  
Jiyu Zheng ◽  
Jinpin Liu
Keyword(s):  
Numerical Simulation ◽  
Pressure Drop ◽  
Gas Pressure ◽  
Borehole Diameter ◽  
Gas Drainage ◽  
Drainage Time ◽  
Drainage Radius ◽  
Simulation Results ◽  
The Impact ◽  
The Relationship

Borehole parameters are quite important for gas drainage. This paper studies the impact of borehole diameter and time on gas drainage and performs numerical simulation on the distribution of gas pressure under the conditions of different borehole diameters and drainage times. The simulation results reveal that, as the borehole diameter increases, the gas drainage volume increases along with it and the gas pressure decreases, but such effect on gas drainage is limited. In terms of drainage time, the longer the drainage time, the greater the drainage impact scope. Taking a gas pressure drop of 51% as the indicator of the effective pre-drainage radius, the distance from the point with a gas pressure drop of 51% to the position of the borehole is the effective pre-drainage radius. When the pre-drainage reached the 30th, 45th, 60th, 75th, and 90th day, the effective pre-drainage radius was 1.04m, 1.29m, 1.51m, 1.68m, and 1.82m respectively. According to the numerical simulation results, the effective pre-drainage radius varies with the pre-drainage time, and the fitting analysis of the two indicates that the relationship between the two can be described by a power function.

Numerical Analysis of the Influences of Water Level on Seepage Stability of Tailing Dam

2014 ◽  
Vol 580-583 ◽  
pp. 1928-1931
Author(s):  
Fang Ding He ◽  
Xue Feng Cao ◽  
Xia Yang ◽  
Zhi Dong Zhou
Keyword(s):  
Numerical Simulation ◽  
Water Level ◽  
Pore Pressure ◽  
Simulation Software ◽  
Saturation Line ◽  
Tailing Dam ◽  
Pressure Changes ◽  
Relationship Of ◽  
The Relationship ◽  
Water Pore Pressure

Understanding the influences of water level on seepage stability of tailing bay is an important topics in hydraulic engineering design. The seepage stability of tailing bay under different water level was calculated with the numerical simulation software FLAC3D and the change laws of water pore pressure and saturation line in the dam was analyzed. The results show that the saturation line in the dam is a parabolic curve and the pore pressure changes in layers. With the increasing of water level, the saturation line in the heaping dam ups rather obviously while it is not obvious in the initial dam. The maximum pore pressure in the bottom of the dam increases with the relationship of water level up, the shallow of the saturation line is in the heaping dam heel.

scholarly journals Numerical simulation of high-pressure gas atomization of two-phase flow: Effect of gas pressure on droplet size distribution

2019 ◽  
Vol 30 (11) ◽  
pp. 2726-2732 ◽  
Author(s):  
Kalpana Hanthanan Arachchilage ◽  
Majid Haghshenas ◽  
Sharon Park ◽  
Le Zhou ◽  
Yongho Sohn ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Size Distribution ◽  
Droplet Size ◽  
Droplet Size Distribution ◽  
Gas Pressure ◽  
Phase Flow ◽  
Gas Atomization ◽  
Two Phase ◽  
Flow Effect

Experimental Investigation of the Shear Strength of Lubricants Subjected to High Pressure and Temperature

1986 ◽  
Vol 108 (4) ◽  
pp. 571-577 ◽  
Author(s):  
E. Ho¨glund ◽  
B. Jacobson
Keyword(s):  
Experimental Investigation ◽  
High Pressure ◽  
Shear Strength ◽  
High Pressure And Temperature ◽  
Mineral Oils ◽  
Wide Range ◽  
Experimental Apparatus ◽  
Synthetic Lubricants ◽  
The Relationship ◽  
Natural And Synthetic

In order to evaluate the relationship between limiting shear strength and pressure for a lubricant an experimental apparatus has been built. Pressures up to 2.2 GPa and temperatures up to 200°C are attainable simultaneously. Thus the limiting shear strength-pressure relationship has been surveyed in a wide range. Several types of natural and synthetic lubricants have been tested. The results show that all the mineral oils tested behave in quite a similar way. Synthetic lubricants do not show this behaviour, but the relationship between limiting shear strength and pressure depends strongly upon the chemical base of the synthetic lubricants. The behaviour of grease does not differ from that of liquid lubricants. The pressures at which the lubricants change from a liquid to a solid behaviour have also been measured.

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