scholarly journals Numerical Simulation and Experimental Study on Flow of Polymer Aqueous Solution in Porous Jet Nozzle

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Minghui Wei ◽  
Chenghuai Wu ◽  
Yanxi Zhou
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Pure Water ◽  
Jet Flow ◽  
Rock Breaking ◽  
Water Jet ◽  
Drilling Process ◽  
Polymer Additive ◽  
Convergent Nozzle ◽  
Jet Nozzle

The addition of a polymer to the jet medium enhances its ability to break rock, and the structure of the nozzle plays a vital role in the full utilization of energy. In this paper, a self-propelled porous jet bit with a support plate is designed, which can prevent the drill bit from jamming due to the jet nozzle against the bottom of the well during the drilling process. And the structural design of the cone-converging nozzle is applied to the forward center nozzle. The polymer additive jet flow field and the pure water jet flow field were compared by numerical simulation and experimental investigation. The results show that the polymer additive jet has a longer isokinetic core, and the rock-breaking volume of the polymer additive jet is much larger than that of the pure water jet, and the optimal spray distance is increased. The forward central jet with the conical convergent nozzle structure has more efficient rock-breaking ability.

Flow-Field and Hydromechanics Analysis of High Pressure Water-Jet Single Nozzle in Radial Horizontal Drilling

2014 ◽  
Vol 952 ◽  
pp. 186-189
Author(s):  
Xian Zhong Yi ◽  
Song Lin Yi ◽  
Hui Shu ◽  
Yuan Qiang Ji ◽  
Sheng Zong Jiang
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Flow Fields ◽  
Rock Breaking ◽  
External Flow ◽  
Water Jet ◽  
Pressure Water ◽  
Jet Nozzle ◽  
High Pressure Water Jet ◽  
Radial Drilling

The technology of high pressure water jet in radial drilling has currently been used widely at home and abroad. A numerical simulation and analysis of the internal and external flow fields of jet nozzle will 1ay the foundation for the further study of high pressure water jet rock breaking. The physical and mathematical models of axial-symmetrical submerged jet rock breaking with single nozzle were established. And a numerical simulation of the internal and external flow fields of high pressure water jet nozzle in radial drilling was conducted with the Fluent software. The 1aws of the internal and external flow fields were analyzed in different jet distances and inlet flow rates.

scholarly journals Experimental Study of the Jet Engine Exhaust Flow Field of Aircraft and Blast Fences

2015 ◽  
Vol 27 (2) ◽  
pp. 181-190 ◽  
Author(s):  
Haifu Wang ◽  
Liangcai Cai ◽  
Xiaolei Chong ◽  
Hao Geng
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Wind Velocity ◽  
Maximum Rate ◽  
Dynamic Pressure ◽  
Jet Flow ◽  
Engine Exhaust ◽  
Jet Engine ◽  
Jet Nozzle

A combined blast fence is introduced in this paper to improve the solid blast fences and louvered ones. Experiments of the jet engine exhaust flow (hereinafter jet flow for short) field and tests of three kinds of blast fences in two positions were carried out. The results show that the pressure and temperature at the centre of the jet flow decrease gradually as the flow moves farther away from the nozzle. The pressure falls fast with the maximum rate of 41.7%. The dynamic pressure 150 m away from the nozzle could reach 58.8 Pa, with a corresponding wind velocity of 10 m/s. The temperature affected range of 40°C is 113.5×20 m. The combined blast fence not only reduces the pressure of the flow in front of it but also solves the problems that the turbulence is too strong behind the solid blast fences and the pressure is too high behind the louvered blast fences. And the pressure behind combined blast fence is less than 10 Pa. The height of the fence is related to the distance from the jet nozzle. The nearer the fence is to the nozzle, the higher it is. When it is farther from the nozzle, its height can be lowered.

Revolving Jet Nozzle Design on Eliminate Surface Soil of Shallow Submersion

2012 ◽  
Vol 591-593 ◽  
pp. 30-33
Author(s):  
Dong Su Zhang ◽  
Gan Lin Cheng ◽  
Zhao Long Liu
Keyword(s):  
External Factor ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Jet Flow ◽  
Water Jet ◽  
Technology Research ◽  
Internal Factors ◽  
Land Mine ◽  
Test Platform ◽  
Jet Nozzle

The revolving jet is a technique method of using the water to eliminate shallow submersion land mine surface, it can be also used in the clearance of mine, the unique characteristic is the main use of shear broken, erosion crushing, stretch broken cyclone grinding effect on the topsoil which is on shallow mines. this technology research and the application. Based on the revolving water jet flow theory and soil mechanics theory, by means of the action of the jet flow to the soil body surface and the mechanism of the revolving jet flow breaking ground analysis, and the thoughts of which the action pressure of jetting is basic external factor of the soil body destruction, but the soil body critical destructive power to soil body is determined by its internal factors that physical and mechanical properties of the soil, only then, when the jet flow action is greater than the soil body the critical destructive power, the soil body only then possibly has the destruction. This technology research and the application not only raise efficiency of the mine clearance, but also further expand application scope of the water Jet. Based on water jet test platform of the laboratory, in order to make the revolving jet produce the greatest ground-breaking efficiency. the swirling jet nozzle and rotating components are optimized for it.

scholarly journals Numerical simulation of the flow rate effect on the evolution of a negatively buoyant water jet

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Oumaima Eleuch ◽  
Zied Driss
Keyword(s):  
Numerical Simulation ◽  
Stokes Equations ◽  
Fluid Model ◽  
Salt Water ◽  
Pure Water ◽  
Water Jet ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Vof Model ◽  
Negative Buoyancy

A numerical simulation study was done on a penetrating pure water jet injected into another surrounding salt water miscible with negative buoyancy conditions. For the incompressible filtered Navier-Stokes equations and the sum of the fluid model volume, we used a transient Computational Fluid Dynamics (CFD) solver (VOF model). A finite volume discretization method using Open Source code given in Open Foam 2.3.0. was used to solve these equations. The flow has a significant impact in the laminar system on the evolution of the jet in terms of subsequent permanent phase as well as the transient regime.

scholarly journals Optimization of Abrasive Water Jet Nozzle Based on Numerical Simulation

2021 ◽  
Vol 1985 (1) ◽  
pp. 012014
Author(s):  
Jiangsheng Deng ◽  
Yuefeng Yuan ◽  
Deran Li ◽  
Hai Cheng ◽  
Cheng Dai ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Jet Nozzle
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