scholarly journals On Simulation and Experiment of Flow Field of Combustion Coal Fallout Detection Instrument Based on CFD

2021 ◽  
Vol 2097 (1) ◽  
pp. 012010
Author(s):  
Yaoshuo Sang ◽  
Qiunan Yan ◽  
Yong Liu ◽  
Long Zhang ◽  
Zhigang Li ◽  
...  
Keyword(s):  
Flow Field ◽  
Flow Velocity ◽  
Wind Velocity ◽  
Three Dimensional ◽  
Exhaust System ◽  
Detection Accuracy ◽  
Average Wind ◽  
Study Characteristics ◽  
Simulation And Experiment ◽  
Detection Instrument

Abstract In order to further improve accuracy and stability of detection of combustion coal fallout propensity of cigarettes, author of the paper adopted computational fluid dynamics (CFD) technology for a three-dimensional numerical simulation of exhaust system of detection instrument, aiming to study characteristics of flow field near cigarettes. Moreover, a simulation model of eight-channel exhaust enclosure was established, obtaining vector diagram for flow velocity of flow field, velocity contour diagram, and pressure distribution cloud diagram. According to findings, flow field of eight channels is evenly distributed, with slow flow velocity around the instrument but furious inside channels. The wind velocity of cigarette monitoring channel is stable at about 200mm/s specified as per standard. However, there is significant change in pressure and flow velocity at the corners of channels, causing local turbulence. In experiments, average wind velocity of 8 monitoring channels was measured, and simulation results were compared with experiment data. Eventually, a conclusion is drawn that simulation result at cigarette monitoring channels changes consistently with the experimental data, with small errors as a whole. Therefore, the designed exhaust system complies with regulations on wind velocity stipulated by YC/T558-2018 Cigarettes—Determination of Combustion Coal Fallout Propensity of Burning Cigarettes. In a word, this paper is hoped to provide technical support for analogue simulation of exhaust system of cigarette detection instrument, and improve detection accuracy.

scholarly journals Study on Flow Field Characteristics of the 90° Rectangular Elbow in the Exhaust Hood of a Uniform Push–Pull Ventilation Device

2018 ◽  
Vol 15 (12) ◽  
pp. 2884 ◽  
Author(s):  
Xiang Wu ◽  
Lindong Liu ◽  
Xiaowei Luo ◽  
Jianwu Chen ◽  
Jingwen Dai
Keyword(s):  
Flow Field ◽  
Wind Velocity ◽  
Cfd Simulation ◽  
Distribution Patterns ◽  
Wind Pressure ◽  
Radius Of Curvature ◽  
Control Effect ◽  
Material Loss ◽  
Average Wind ◽  
Flow Field Characteristics

A uniform push–pull ventilation device can effectively improve indoor air quality (IAQ). The 90° rectangular elbow is an important part of the push–pull ventilation device. This paper analyzes the flow field characteristics of the 90° rectangular elbows under different working conditions. This was done by using computational fluid dynamics (CFD) simulation (Fluent). The flow lines, velocity and pressure distribution patterns of the elbow flow field are revealed in detail. The wind velocity non-uniformity and wind pressure non-uniformity of the 90° rectangular elbows with different coefficients of radius curvature R and rectangular section height h are also compared. The results show that when R ≥ 2.5 h, the wind flow traces inside the elbow are basically parallel lines. At the same time, the average wind velocity and the average wind pressure are stable. Also, the wind velocity non-uniformity and wind pressure non-uniformity decrease with the increase of R. Therefore, considering the space and material loss caused by an increase in radius of curvature, the elbow with R = 2.5 h can be used as the best design structure for the 90° rectangular elbow, which is of great significance for improving the control effect of dust and toxic pollutants in a uniform push–pull ventilation device.

Simulation of Simplified Three-Dimensional Space Flow Velocity Field in Reservoir on the Condition of Unsteady Flow and its Application

2012 ◽  
Vol 203 ◽  
pp. 514-518
Author(s):  
Shi Ping Fan ◽  
Jian Ming Yang ◽  
Min Quan Feng ◽  
Bang Min Zheng
Keyword(s):  
Numerical Calculation ◽  
Velocity Field ◽  
Flow Field ◽  
Unsteady Flow ◽  
Flow Velocity ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Flow Velocity Field ◽  
Flood Period ◽  
Three Dimensional Space

In view of the complexity of the conventional simulation calculation method of three-dimensional flow field for the reservoir, and to analysis of the change of the reservoir’s flow field in flood period, in this paper, based on the unsteady flow numerical calculation, the simulation method for three-dimensional space flow velocity field of the reservoir in flood period was studied and applied to the Wenyuhe Reservoir. First refining the actual extraction of grid, and then having an unsteady flow numerical calculation for the reservoir, finally through layering and stripping the grid, three-dimensional space flow velocity field the reservoir on the condition of unsteady flow has been studied. The results showed that the reservoir velocity along the flow direction is becoming smaller, and surface velocity is fast; with the flow increase gradually, the unsteady flow has a great effect on the flow field of the reservoir’s concave bank. The grid can at will encryption, so the calculation precision can be effectively controlled and the process of simulation is easy to be programmed. The research results can simplify the complexity of the reservoir for three-dimensional numerical simulation, and up to providing theoretical support for reservoir flood control.

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.

scholarly journals An Investigation of Acoustic Attenuation Performance of Silencers with Mean Flow Based on Three-Dimensional Numerical Simulation

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Wei Fan ◽  
Li-Xin Guo
Keyword(s):  
Flow Field ◽  
Flow Velocity ◽  
Cfd Simulation ◽  
Data Transfer ◽  
Transmission Loss ◽  
Three Dimensional ◽  
Mean Flow ◽  
Acoustic Attenuation ◽  
3D Fem ◽  
Expansion Chamber

Transmission loss (TL) is often used to evaluate the acoustic attenuation performance of a silencer. In this work, a three-dimensional (3D) finite element method (FEM) is employed to calculate the TL of some representative silencers, namely, circular expansion chamber silencer and straight-through perforated pipe silencer. In order to account for the effect of mean flow that exists inside the silencer, the 3D FEM is used in conjunction with the Computational Fluid Dynamics (CFD) simulation of the flow field. More concretely, the 3D mean flow field is computed by firstly using CFD, and then the obtained mean flow data are imported to an acoustic solution undertaken using FEM. The data transfer between the two steps is accomplished by mesh mapping. The results presented demonstrate good agreement between present TL predictions and previously published experimental and numerical works. Also, the details of the flow inside the silencers may be studied. Furthermore, the effect of mean flow velocity on acoustic attenuation performance of the silencers is investigated. It is concluded that for the studied silencers, in general, increasing flow velocity increases the TL and decreases the resonance peaks.

Three-Dimensional Flow Field Measurements in a Radial Inflow Turbine Scroll Using LDV

1987 ◽  
Vol 109 (2) ◽  
pp. 163-169 ◽  
Author(s):  
M. F. Malak ◽  
A. Hamed ◽  
W. Tabakoff
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Flow Velocity ◽  
Three Dimensional ◽  
Field Measurements ◽  
Three Dimensional Flow ◽  
Cold Flow ◽  
Dimensional Flow ◽  
Through Flow ◽  
Radial Inflow Turbine

The results of an experimental study of the three-dimensional flow field in a radial inflow turbine scroll are presented. A two-color LDV system was used in the measurement of three orthogonal velocity components at 758 points located throughout the scroll and the unvaned portion of the nozzle. The cold flow experimental results are presented for through-flow velocity contours and the cross velocity vectors.

Numerical simulation of three-dimensional flow field in compact spinning with Hollow Roller

2014 ◽  
Vol 26 (2) ◽  
pp. 131-144 ◽  
Author(s):  
Xinjin Liu ◽  
Xuzhong Su
Keyword(s):  
Flow Field ◽  
Flow Velocity ◽  
Surface Structure ◽  
Three Dimensional ◽  
Round Hole ◽  
Content Type ◽  
Roller Surface ◽  
Fluent Software ◽  
Groove Structure ◽  
Compact Spinning

Purpose – Condensing roller is the most key parts of compact spinning system. Hollow Roller is one of the most important kinds of condensing roller, the surface structure of which influences the flow field in condensing zone directly and affects the qualities of spun yarn. The purpose of this paper is to study the effect of Hollow Roller surface structure on flow field in condensing zone is investigated by using Fluent Software. Design/methodology/approach – In this paper, the effect of Hollow Roller surface structure on flow field in condensing zone is investigated by using Fluent Software. The numerical simulations of the three-dimensional flow field in Hollow Roller compact spinning with two different kinds of roller surface structure, round hole structure and strip groove structure, are given according to the three-dimensional physical model of condensing zone. The flow velocity and static pressure distributions in condensing zone are given. Findings – It is shown that the flow velocity streamline distribution is denser with strip groove structure than that of round hole structure, especially on the center line of strand, and flow velocity value is also larger in both Y-Z and X-Y cross-sections, and in X-Z cross-section shows the embracing inlet airflow, which is benefit for fiber condensing directly and improving negative pressure use efficiency. Furthermore, the simulations with three strip groove widths 0.4, 0.8 and 1.2 mm are given. The theatrical results obtained are illustrated by experiments. Originality/value – In this paper, the effect of Hollow Roller surface structure on flow field in condensing zone is investigated by using Fluent Software in detail. A more accurate three-dimensional physical model of condensing zone is given. A new kind of strip groove structure of Hollow Roller is proposed. The theatrical results obtained are illustrated by experiments, and lay a foundation for practical Hollow Roller design.

Experimental and Three-Dimensional CFD Investigation in a Gas Turbine Exhaust System

1999 ◽  
Vol 121 (2) ◽  
pp. 364-374 ◽  
Author(s):  
B. K. Sultanian ◽  
S. Nagao ◽  
T. Sakamoto
Keyword(s):  
Flow Field ◽  
Gas Turbine ◽  
Three Dimensional ◽  
Exhaust System ◽  
Scale Model ◽  
Laser Doppler Velocimeter ◽  
Complex Flow ◽  
Full Speed ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust

Both experimental and three-dimensional CFD investigations are carried out in a scale model of an industrial gas turbine exhaust system to better understand its complex flow field and to validate CFD prediction capabilities for improved design applications. The model consists of an annular diffuser passage with struts, followed by turning vanes and a rectangular plenum with side exhaust. Precise measurements of total/static pressure and flow velocity distributions at the model inlet, strut outlet and model outlet are made using aerodynamic probes and locally a Laser Doppler Velocimeter (LDV). Numerical analyses of the model internal flow field are performed utilizing a three-dimensional Navier-Stokes (N-S) calculation method with the industry standard k-ε turbulence model. Both the experiments and computations are carried out for three load conditions: full speed no load (FSNL), full speed mid load (FSML, 57 percent load), and full speed full load (FSFL). Based on the overall comparison between the measurements and CFD predictions, this study concludes that the applied N-S method is capable of predicting complicated gas turbine exhaust system flows for design applications.

Numerical Simulation on the Airflow of Electric Cutting Tool

2010 ◽  
Vol 97-101 ◽  
pp. 3691-3695
Author(s):  
Qiao Fang Zhang ◽  
Ke Zhou ◽  
Ming Huan Wang ◽  
Wei Peng
Keyword(s):  
Numerical Simulation ◽  
Wind Velocity ◽  
Velocity Vector ◽  
Cutting Tool ◽  
Three Dimensional ◽  
Cooling Condition ◽  
Stagnation Flow ◽  
The Poor ◽  
Simulation And Experiment ◽  
Better Than

The numerical simulation and experiment had been applied to study the cooling of electric cutting tool. Temperature and wind velocity vector of three-dimensional cooling duct were obtained by Fluent. From the numerical simulation, the stagnation flow, reflow and backset which resulted in the poor cooling condition of the electric cutting tool were discussed. By modifying ribs, partition and outlet, a new cooling duct was reconstructed. The cooling effect of the new cooling duct was better than the original one by the experiment test.

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