Numerical Simulation of Swirling Burner in Cold State

2013 ◽  
Vol 712-715 ◽  
pp. 1376-1379
Author(s):  
Min Li ◽  
Chun Yu Wang ◽  
Li Ming Ren ◽  
Bu Ting Zhang ◽  
Lu Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Cone Angle ◽  
Return Flow ◽  
Flow Zone ◽  
Design Modification ◽  
Cold State ◽  
Outlet Flow ◽  
Secondary Air ◽  
Computer Numerical Simulation

The computer numerical simulation of swirling burner in cold state was taken in this paper. The swirling intensity and the expansion cone angle of the secondary air were the main simulation content. The outlet flow field and form of the combustor were got through the simulation, and the comparison of the airflow diffusion angle and the return flow zone were analyzed, and then the guidance suggestions on the design modification and operation adjustment of the existing swirl burner were proposed.

Numerical Simulation Investigations of DRB-4Z Type Dual Channel Swirl Burner Outlet Flow Field

2012 ◽  
Vol 614-615 ◽  
pp. 315-320
Author(s):  
Cui Li Mi ◽  
Xiao Hua Fan ◽  
Gang Wei ◽  
Yong Sheng Zhang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Combustion Stability ◽  
Blade Angle ◽  
Air Velocity ◽  
Swirl Burner ◽  
Dual Channel ◽  
Outlet Flow ◽  
Recirculation Zones ◽  
Secondary Air

Numerical simulation was used to analyze and calculate the outlet flow field of DRB-4Z type dual channel swirl burner. The results indicate that the recirculation zones become shorter, the diameter of the recirculation zones and the flow divergent angle decrease with the rising of the primary air velocity. Too lower primary air velocity causes the mixing of primary air and secondary air become weaker, which goes against the stable ignition of pulverized coal. With the increase of the outer secondary air blade angle, the flame length increases obviously. The mixing of primary air and outer secondary air is delayed, which decreases the combustion stability. Too small angle of the outer secondary air causes the generation of recirculation zone in the center of flame tail, which has adverse effect on the combustion stability. The attenuation of the highest axial velocity and tangential velocity become faster with decreasing of outer secondary air blade angle.

Simulation and Experimental Analysis of the Effect of Channel Width on Flow Field in Laser Cutting

2009 ◽  
Vol 626-627 ◽  
pp. 171-176 ◽  
Author(s):  
X.J. Sheng ◽  
Jun Hu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Laser Cutting ◽  
Cone Angle ◽  
Three Dimensional ◽  
Channel Width ◽  
Gas Jet ◽  
Channel Surface ◽  
Symmetrical Model ◽  
Cutting Experiment

A three-dimensional axial symmetrical model of laser cutting is established by adopting N-S equation in the paper, and numerical simulation is put up to analyze the flow field of assist gas in cutting channel. The investigation reveals the law about how channel width affects the dynamic characteristic of gas jet in the cutting process, and the distributions of pressure and velocity of gas jet with different channel widths are shown in the study. The study shows that the intensity of compressed wave and expanded wave in cutting channel declines remarkably with channel width increasing, and the kinetic energy at channel surface drops while the cutting quality is deteriorated. A taper nozzle with cone angle of 30°and a convergence nozzle comprised a parabola equation of are designed for the laser cutting experiment. The experimental results are given at the end of the paper.

Numerical Simulation and Experiment on Assemble Nozzles’ Flow Field in Laser Cutting

2010 ◽  
Vol 663-665 ◽  
pp. 1302-1305
Author(s):  
Jun Hu ◽  
Qian Qian Cao ◽  
Jing Wen Luo
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Laser Cutting ◽  
Cone Angle ◽  
Three Dimensional ◽  
Conical Nozzle ◽  
Convergent Nozzle ◽  
Free Jet ◽  
Symmetrical Model ◽  
Simulation And Experiment

Based on a convergent nozzle and a conical nozzle, the simulation of the free jet of assemble nozzles by adopting a three-dimensional axial symmetrical model is presented in the paper. The study reveals the effect of cone angle of conical nozzle and the parabola equation of convergent nozzle on flow field by adjusting nozzles’ interior figure parameters. The distribution of pressure and velocity of gas jet are shown in the investigation. A conical nozzle with cone angle of 30° and a convergent nozzle described by the parabola equation of y=0.207x2 are designed and produced for the laser cutting experiment. Numerical simulation and experimental results are given at the end of the paper.

Numerical Simulation and Improved Design of Inner Flow Field on Single Function Shower

2012 ◽  
Vol 246-247 ◽  
pp. 423-427
Author(s):  
Jing Huang ◽  
Jun Zhang ◽  
Hong Zhou He ◽  
Ming Fang Lu ◽  
Xiao Liu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Flow Speed ◽  
Single Function ◽  
Working Medium ◽  
Water Region ◽  
Outlet Flow ◽  
Improved Design

To reveal the variation of the inner flow field on a single function shower, numerical simulation was conducted for single-phase flow using water as the working medium. The standard k-ε turbulence model is employed to simulate inner flow characteristics. To improve the uniformity of outlet flow, according to the simulation results of the old shower, the mold structural have been modified. The results show that, the outlet shape and different size will affect the internal flow field. According to the old shower analysis of the flow, speed of the outlet fluctuations are more obvious, while the improved shower flow rate of the outlet distribution is more uniform and old shower exists of vortex in the two shares of water region, but improved shower vortex is smaller and the distribution of flow is also better than the former.

Simulation and Analysis the Internal Flow Field of Control Valve Bonnet Leakage

2013 ◽  
Vol 423-426 ◽  
pp. 2078-2081 ◽  
Author(s):  
Yan Tao An ◽  
Ru Jian Ma ◽  
Yong Wang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Flow Direction ◽  
Control Valve ◽  
Internal Flow ◽  
Surrounding Area ◽  
Valve Body ◽  
Outlet Flow ◽  
Cfd Numerical Simulation

Apply the CFD numerical simulation the internal flow field and noise when the control valve is bonnet leakage and trouble-free. Research shows that bonnet leaking has almost no effect on valve inlet and outlet flow field. It is an impact on valve body flow field and the greatest impact on balance cavity. It changes the flow direction of the balance cavity and produces right vortex, in balance cavity where originally without noise, the tremendous noise appeares and improves the noise of the surrounding area.

scholarly journals Numerical Simulation of Characteristics of Spray Flow Field on the Conical Surface

2020 ◽  
Vol 1670 ◽  
pp. 012030
Author(s):  
Shiming Chen ◽  
GuichunYang ◽  
Shuang Zhou ◽  
Wenzhuo Chen ◽  
Jinfa Guan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Conical Surface

scholarly journals Influence of Vortex Finder Structure on Separation Performance of Double-Overflow Three-Product Hydrocyclones

Separations ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 79
Author(s):  
Yuekan Zhang ◽  
Jiangbo Ge ◽  
Lanyue Jiang ◽  
Hui Wang ◽  
Junru Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Experimental Research ◽  
Separation Efficiency ◽  
Structural Parameters ◽  
Separation Performance ◽  
Insertion Depth ◽  
Flow Field Characteristics ◽  
Vortex Finder ◽  
Fine Classification

In view of the difficulty of traditional hydrocyclones to meet the requirements of fine classification, a double-overflow three-product (internal overflow, external overflow and underflow) hydrocyclone was designed in this study. Numerical simulation and experimental research methods were used to investigate the effects of double-overflow flow field characteristics and structural parameters (i.e., internal vortex finder diameter and insertion depth) on separation performance. The research results showed that the larger the diameter of the internal vortex finder, the greater the overflow yield and the larger the cut size. The finest internal overflow product can be obtained when the internal vortex finder is 30 mm longer than the external vortex finder. The separation efficiency is highest when the internal vortex finder is 30 mm shorter than the external vortex finder.

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