Papers by Keyword: Flow Field Simulation

Abstract: In this paper, CFD numerical simulation method was adopted to study the internal flow field of experimental dry granulating device of blast furnace slag and to research the impact of equipment structure and wind speed on cooling effectiveness. Main content included the internal flow field uniformity under different blade type and number of inlets. The results showed that the internal flow field in strip-blades device was more uniform than fan-shaped blades device. With the increase of air inlets quantity, the internal flow field in device became more uniform and stable, especially when there were 8 air inlets in the equipment.

Abstract: This paper is based on completed the design of the main structure of the fumigation treatment bed according to the size of the human body’s structure. And the solid modeling of each part is carried out in the CATIA environment. Then the working process of the fumigation bed is simulated by using the virtual prototype module of CATIA software. Using the FLUENT flow field analysis software to analyze the temperature field and velocity field of the fumigation tank’s inward under different conditions. With setting different variables in each condition gradually optimize the temperature field and velocity field in the fumigation tank’s inward.

Abstract: Combined with the special structure of mortar shell empennage, a one-dimension projectile trajectory corrector positioned at the empennage is proposed. Flow field simulation is taken in Fluent and the drag coefficient of mortar shell is calculated. The drag coefficient is fitted to get the fitting curves by using Logistic function and polynomial function. Trajectory model is established and solved, the correction capability is evaluated and the correction precision is analyzed. The simulation analysis indicates that this trajectory corrector is feasible and has obvious correction capability.

Abstract: In the situation that energy is increasingly grim, how to use high-sulfur fuel effectively and reasonably is a big problem for high-energy consumption cement industry. But high-sulfur fuel will also brought up crusting problem because of higher concentration of circulating and accumulating volatile components. By-pass system can resolve this problem. Rapid-cooling mixer is key equipment for by-pass system. The thermal flow field inside the mixer determines the performance of rapid-cooling mixer directly. CFD method is used to simulate the flow field and temperature field inside mixer. The simulation result help to guide and test the improvement of mixer structure design. After optimization structure design, the mixing of hot gas and cooling air is full and strong inside mixer that leads to excellent cooling effect and good protection for equipment from crusting.

Abstract: In order to analyze the influence of structure parameter of air-suction roller-type precision metering device on the flow velocity and pressure, the flow field was calculation and simulation. Take the compressibility and the viscosity of the real gas into account, the N-S equations, RNG k-ε turbulence model and wall function were applied to measure the flow rate and pressure of the outlet under the conditions of changing the area of the suction holes and the diameter of shaft. The results revealed that compared with the shaft holes area, the diameter of center axis have a marked influence on the flow velocity and pressure of outlet. When the area of suction holes is constant, with the increase of shaft diameter, the outlet velocity increased and pressure decreased; when the diameter of axle is constant, with the shaft holes area increase, the outlet velocity increased and pressure decreased.

Abstract: In this paper, a unique design of low temperature of BTA deep-hole machining system based on the green manufacturing was proposed,in which the low temperature air cutting technology was applied to the BTA deep hole processing. Consequently, the system have the characteristics of low temperature air cutting and deep hole processing. The system presented here uses the large flow of cold air (-30 °C ~-20 °C) and oil mixing atomization gas (MQL) for chip removal, cooling and lubricating the tool, thus the use of deep hole cutting oil was decreased, the cooling and lubricating effect of the tool was strengthened and the tool life was also strengthened. In this article, the ANSYS CFX was used for simulating the internal flow field of chip removal channel. By means of simulations, it is concluded that the pressure difference between the low temperature cold wind is significantly greater than the pressure difference between the liquid, and the gas flow rate is greater than the liquid flow rate. The comprehensive analysis indicate that low temperature air system are likely to bring about a better ability of chip removal, which provides theoretical basis for the low temperature air cutting technology was applied to deep-hole machining system.

Abstract: In this paper, computational fluid dynamics software to simulate three-dimensional flow of marine propeller applications was introduced and described the 3D-CAD model building process, complex moving mesh division methods of the region, three-dimensional rotating turbulence model selection and analysis of the results. Visual image obtained the pressure distribution, flow velocity distribution of the marine propellers, and focused on analyzing the reasons for producing results.

Abstract: In this paper, the software FLUENT was employed and the two-dimensional flow fields of external gear pump, such as flow distribution, velocity distribution, pressure distribution, turbulent kinetic energy distribution are obtained. The results show that the pressure of the pump presents the symmetry and the maximum static pressure is 0.127 MPa at the oil absorption cavity inlet. The maximum velocity appeared in the left side of the gear pump body reached 6.97m/s and the minimum velocity reached 1.09m/s on the two gears meshing line. Turbulence kinetic energy distribution of the pump shows the symmetry and the minimum turbulent kinetic energy appeared in the two gear mesh is 0.0312m²/s². Meanwhile, the maximum turbulent kinetic energy reached 12.2 m²/s² at the exit of the oil cavity. The maximum exit velocity appeared at the position of the intermediate point reached 3m/s. The results have referenced significance for design and analysis of external gear pump.

Abstract: Fan nozzle is the core component of tool cooling system, but the study on spray characteristics of the nozzle is not deep enough. Solid Works model of fan nozzle was established in this paper, the injection characteristics of nozzle are simulated by FLUENT analysis. Influence law of the injection characteristics of fan nozzle was studied by changing some parameters of fan nozzle spray in the process, such as liquid viscosity, nozzle flow, operating pressure and surface tension. The simulation results show that in the case of other parameters are the same, the higher the operating pressure is, the higher the jet velocity of fan nozzle is, the jet diffusion of fan nozzle along a flat direction increases firstly and then decreases; The higher the liquid surface tension is, the smaller the jet diffusion of fan nozzle along a flat direction, but the influence of liquid surface tension to the jet velocity of fan nozzle outlet can be neglected.

Abstract: The Reynolds stress model (RSM) provided by FLUENT software was applied to study flow field of a cyclone separator used in some circulating fluidized bed. The pressure distribution and velocity distribution was analyzed. The simulation results reveal the strong swirling flow and vortex structure in cyclone separator.