scholarly journals Research of the coal dust size range influence on low-temperature vortex combustion based on numerical simulation

2015 ◽  
Vol 23 ◽  
pp. 01044 ◽  
Author(s):  
Ksenia Y. Shcherbakova ◽  
Pavel S. Gergelizhiu ◽  
Boris V. Lebedev
Keyword(s):  
Numerical Simulation ◽  
Low Temperature ◽  
Size Range ◽  
Coal Dust ◽  
Vortex Combustion

scholarly journals Numerical Simulation of the Effects on Low Temperature Drainage from LNG on the Ocean Water Environment

2017 ◽  
Vol 05 (03) ◽  
pp. 71-80
Author(s):  
Mingyuan Sun ◽  
Yi Zhang ◽  
Longxi Han ◽  
Bo Chen ◽  
Tiantian Liu
Keyword(s):  
Numerical Simulation ◽  
Low Temperature ◽  
Water Environment ◽  
Ocean Water

scholarly journals Numerical simulation of combustion of a polydisperse suspension of coal dust in a spherical volume

2016 ◽  
Vol 8 (3) ◽  
pp. 531-539 ◽  
Author(s):  
Alexey Yurjevich Krainov ◽  
Kseniya Mikhailovna Moiseeva ◽  
Dmitrii Yurjevich Paleev
Keyword(s):  
Numerical Simulation ◽  
Coal Dust ◽  
Polydisperse Suspension ◽  
Spherical Volume

scholarly journals Experimental Research and Numerical Simulation of Ejector Precipitator in a Fully Mechanized Mining Face

2020 ◽  
Vol 45 (11) ◽  
pp. 9815-9833
Author(s):  
Guodong Zhai ◽  
Wentao Zhang ◽  
Yaozong Li ◽  
Xinghao Lu ◽  
Wenyuan Hu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Negative Pressure ◽  
Coal Dust ◽  
Structural Parameters ◽  
Dust Concentration ◽  
Dust Removal ◽  
Measuring Point ◽  
Mining Face ◽  
Supply Water

AbstractIn order to effectively reduce the coal dust concentration in a fully mechanized mining face, this research used laboratory experiment, numerical simulation, and field test to conduct an in-depth exploration of the ejector precipitator installed at the low-level caving coal hydraulic support. Firstly, through the experimental platform in the laboratory, the dust removal effect of the nozzle with different structural parameters was tested, and the 3D particle dynamic analyzer was adopted to verify its atomization characteristics; then, the structural parameters corresponding to the nozzle in the best test results were obtained. Secondly, by using Fluent, the negative pressure flow field in the ejector barrel was numerically simulated. The results indicated that when the pressure of supply water was 12 MPa, the negative pressure value formed in the flow field was the lowest and the inspiratory velocity was the largest, which was conducive to dust removal. Finally, the tests of liquid–gas ratio and dust removal ratio were carried out in a fully mechanized mining face. The results showed that when the nozzle specification recommended by the experiment and the pressure of supply water recommended by the numerical simulation were used, the removal ratios of the total coal dust and the respirable coal dust were 89.5% and 91.0%, respectively, at the measuring point of the highest coal dust concentration. It indicates that the ejector precipitator has a good application effect in reducing the coal dust concentration in a fully mechanized mining face and improving the work environment of coal mine workers.

The Primary Discussion of Blade Sections for Application of Helium Compressor

2008 ◽  
Author(s):  
Yu E. Liu ◽  
Yufeng Sun
Keyword(s):  
Numerical Simulation ◽  
Size Range ◽  
Simulation Models ◽  
Compressor Blade ◽  
Working Fluid ◽  
Numerical Studies ◽  
Cascade Flow ◽  
Compressor Design ◽  
Inlet Conditions ◽  
Similarity Relationships

The investigation of the airfoil is a key design issue in the development and deployment of helium compressor for High Temperature Gas Cooled Reactor. As the helium physical properties are different from the air’s, three flow cases are studied to find out the similarities between helium and air using Fluent in this paper. They are flow within the divergent nozzles, flow around cylinders and flow over cascades under same inlet conditions and geometry. The results indicated some similarity relationships between helium and air cascade flow. NACA 65-(12A10)10 compressor blade was used as sample blade for both air and helium cascades. To test the performance of the blades, calculations were carried out under the condition of kinematics similitude, but different working fluid. The numerical simulation results of air cascades are correlated with NACA experiment results of air subsonic cascades very well. The numerical simulation models for the air subsonic cascades were used to test the performance of similar helium cascades. The cascade performance for helium flows were compared with the air flows and the results are presented in this paper. The purpose of numerical studies is to use blades in the current air compressor as the blades for helium compressor, to develop scaling blades in NACA 65-(12A10)10 blade size range, and to identify practical limitations to the scaling of current conventional blades. The analysis and conclusions presented in this paper can be used as a reference to helium compressor design features and the experimental research works.

Modelling of Flow Behaviour of Magnesium Alloys

2016 ◽  
Vol 716 ◽  
pp. 360-367
Author(s):  
Carlo Bruni
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Low Temperature ◽  
Magnesium Alloys ◽  
Flow Curve ◽  
Flow Behaviour ◽  
Temperature Deformation ◽  
Flow Curves ◽  
High Deformation ◽  
Modelling Approach

The present investigation aims at studying the flow behaviour of magnesium alloys under different conditions in terms of temperature, deformation velocities and deformation. The modelling approach was based on a proposed equation to model the shape of each flow curve through different variables. The modelled flow curves were subsequently compared with those obtained with experiments. The models were validated on flow curves not used in the building stage. It was observed that, for low temperature values, high deformation velocities and deformations the final part of the flow curve has to be adapted in order to be adopted for the description of material in the numerical simulation. In other words it needs to be extrapolated. Also for the high temperature, the flow softening has to be limited in order to allow the extrapolation queue required for elevated deformations. The deformation value at which the extrapolation can start can be predicted with an other proposed equation detailed in the paper.

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