Numerical simulation of air flow distribution in large air-cooled turbo generator rotor at different rotation speed and inlet pressure

Under the requirement of clean production, a new type of slurry blast device for mechanically removing oxide scale on the surface of steel strips is presented, which can avoid the serious problems of rapid wear, low service life, and low efficiency of the traditional abrasive water jet with a nozzle. In this paper, the numerical simulation of the rotating blade centrifugal jet in the slurry blast device is conducted based on CFD, where the DPM and the erosion model are innovatively employed to simulate the movement characteristics of abrasive particles and the erosion rate of mixed slurry on the surface of the steel strip. Simulation results show that the erosion rate and particle motion velocity are proportional to the blade rotation speed and inlet pressure. Reasonable inlet pressure and rotation speed are helpful for improving the rust removal efficiency of slurry blast devices. An experimental system is established to validate the simulation results. The experimental results are consistent with the simulation trend, which exhibits that the developed slurry blast device is feasible for steel strip descaling. This work will play substantial guiding roles in the engineering optimization of slurry blast devices for steel strip descaling.

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Numerical Simulation of the Effects of Operating Parameters on the Electrical Performance of DEFC

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.791-793.1897 ◽

2013 ◽

Vol 791-793 ◽

pp. 1897-1900 ◽

Cited By ~ 1

Author(s):

Dong Tang ◽

Wen Shuai Zhao

Keyword(s):

Numerical Simulation ◽

Diffusion Layer ◽

Operating Temperature ◽

Air Flow ◽

Catalyst Layer ◽

Graphite Powder ◽

Simulation Method ◽

Inlet Pressure ◽

Electrical Performance ◽

Direct Ethanol Fuel Cell

The sintered body of tubular cathode for Direct Ethanol Fuel Cell (DEFC) is prepared by the gelcasting process using a certain proportion of graphite powder and mesocarbon microbead (MCMB). The electrical performance under different air flow rates, operating temperature, porosity of cathode diffusion layer, inlet pressure and different thickness of catalyst layer are analyzed by the combination of experimental and numerical simulation method. The results show that the increase of diffusion layer porosity, inlet pressure, thickness of catalyst layer and operating temperature are benefit for the improvement of the cell performance. Moreover, the electrical performance is improved when the air flow rate is 100 mL/min.

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Numerical Simulation of Flow Filed in ESP Outlet with Moving Electrode Type

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.485.27 ◽

2012 ◽

Vol 485 ◽

pp. 27-30

Author(s):

Man Yin Hu ◽

Yu Chao Liang ◽

Kai Che ◽

Guang Han ◽

Xiang Chen

Keyword(s):

Numerical Simulation ◽

Flow Field ◽

Flow Velocity ◽

Geometric Model ◽

Air Flow ◽

Flow Distribution ◽

Simple Algorithm ◽

Equation Model ◽

Opening Ratio ◽

Air Flow Velocity

The numerical simulation of 2-D flow filed in ESP with Moving Electrode Type was carried out, in which a 2-equation model was adopted to simulate the flow field and the computation based on the SIMPLE algorithm and the geometric model was meshed with GAMBIT. The numerical simulation of flow field with FLUENT came to the conclusion that the air flow distribution in the electro static precipitator will change when the opening ratio of the electrodes and the air flow velocity in operation have changed, so the result of numerical simulation was reasonable for the design and operation of the ESP with Moving Electrode Type.

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Numerical Simulation of air Temperature and air flow Distribution in a Cabinet tray Dryer

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.k1787.0981119 ◽

2019 ◽

Vol 8 (11) ◽

pp. 1836-1840

Keyword(s):

Experimental Data ◽

Numerical Simulation ◽

Air Temperature ◽

Large Scale ◽

Air Flow ◽

Flow Distribution ◽

Improve Quality ◽

Air Movement ◽

Drying Chamber

The quality of dried product can be enhanced in cabinet tray dryers through a uniform distribution of drying air flow and temperature. In this work, a numerical investigation is conducted to examine the consequence of air movement on the quality of product dried in a convective tray dryer. The temperature and velocity contours of air in the drying chamber are numerically determined for three different geometries of cabinet tray dryer and are compared. A good harmony is found between the predicted data from CFD and experimental data from the literature. This work will enable us to optimize the drying chamber design for uniform dispersal of air flow and temperature and to improve quality of dried product for large scale applications

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THE EFFECTS OF VARIOUS OPENING SIZES AND CONFIGURATIONS TO AIR FLOW DISPERSION AND VELOCITY IN CROSS-VENTILATED BUILDING

Jurnal Teknologi ◽

10.11113/jt.v82.14537 ◽

2020 ◽

Vol 82 (4) ◽

Author(s):

Wardah Fatimah Mohammad Yusoff

Keyword(s):

Numerical Simulation ◽

Wind Speed ◽

Indoor Air ◽

Field Measurement ◽

Air Flow ◽

Flow Distribution ◽

Air Velocity ◽

Humid Climate ◽

Venturi Effect ◽

Natural Cross

The application of natural cross-ventilation in buildings located in the area where the wind speed is low is such a challenge. In hot and humid climate, sufficient air velocity is necessary in providing thermal comfort. Hence, this study intends to investigate the possibility of enhancing the indoor air velocity and flow distribution by employing the Venturi effect at the openings. Two research methods were applied namely field measurement and numerical simulation. The field measurement was executed at a single zone cross-ventilated building. Its purpose is to validate the numerical simulation steps and procedures. Meanwhile, investigations of the air velocity and flow distribution were conducted using ANSYS FLUENT CFD software. The findings indicate that the Venturi effect did occur at the openings. Providing a confined area at the inlet may enhance the Venturi effect, thus increasing the indoor air velocity. Based on the investigated scenario, it is found that the highest indoor air velocity of 0.2 m/s was achieved for the 75 % opening size with 1.5 m projection. This value indicated enhancement as the outdoor air velocity near the inlet was around 0.14 m/s only. The findings also indicate that the indoor air flow distribution of high air velocity focused more at the area of flow path between the inlet and outlet. The findings can be as guidance in enhancing the natural cross-ventilation in buildings especially that are located at the area where the wind speed is low. Nevertheless, the findings are limited to low-rise building with such opening configuration. Further study needs to be executed to determine the effects to other opening configurations and building heights.

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