Simulation of the air flow within the fan
Release date：2015/8/10
Within the fan air flow simulation study forest near the mountain, Ma Ru Jian, Zhao, Fan Yong Jinan 7 machine drive Institute, Mountain Fen South 3, the air flow for anti-true analysis, distribution are fluid velocity pressure and the fan at the outlet speed field of numerical simulation to optimize the design wind turbine provided.
Fan has a wide range of uses, at this stage people flow field distribution at the outlet of the air flow and fan inside is not very clear, we can not provide for the selection and cloth Su rational design material flow fan structure. 33 perish based on the financial structure is a kind of electromagnetic and acoustic thermal fluid in the body of large general-purpose finite element software, widely used in industrial water conservancy railroad cars shipbuilding fluid analysis can be run on a PC or workstation, capable of thermal stress analysis of flow field analysis multiphysics coupling electromagnetic field analysis and other analysis and referral analysis. The former strongman and has 17 processing functions. Analysis of the flow field solver module 1 Sapporo 01 energy conservation based on mass conservation and momentum conservation, solving the flow field speed card of the temperature distribution and other parameters. The use of six, four machine software and the flow field of a simulation analysis. Able to fit 4 machine structure, material selection and design of the village fabric flow provide a theoretical basis. He had to meet a fan dimensional air flow field within a flow field of mathematical model ll violate conservation of energy equation is less than 6 to insects, very close to the material flow + Videos. , Quarters 1; a single form of air flow can be defined as having a constant particle density and no rotational movement, which is the movement of air in a very good approximation, Bernoulli 6, squeak equation gives the velocity and pressure changes 13 dead + F = constant, where the dead air of the static pressure, is often the bit density, while the + is called dynamic, static and dynamic pressure and is a constant, the energy conservation law. 1.2 continuity equation in the air flow, air velocity can be derived from the potential function, at every point there is only the value of the potential function. Now set up a Cartesian coordinate system, the thousand Ke point, degree, parallel to the axis velocity component and 17 〃 come. Potential gradient can be given by the speed of these points, please, Jordan and other potential of an imaginary line that all points with the same velocity potential function value. The equipotential lines everywhere perpendicular to the flow line through it the potential function must satisfy Laplace equation children knocking + =, which shows the flow field in any one area, when there is no air in which the accumulation of air must flow into it, etc. It's corpse out of the air. You can dress as + =, which is enough to satisfy the continuity of party kneaded mass conservation.
1.3 momentum equation is the momentum theorem momentum equation in fluid mechanics, with thousands of computational fluid flow to limit its work force with the body wall. Momentum theorem states that an external force acting on the particle system is equal to the rate of change of momentum of the particle system in the direction of the force 2.
Weight flow per unit time divided into six flow tube in accordance with the continuity equation the Hill, along = 12 = 61 7 momentum into the square, assuming 1.4 Boundary Conditions uniform inlet velocity and perpendicular to the direction of fluid velocity 1 on imports of zero. Shi Received Date Fund Project Shandong Transportation Research projects on all border financing forest near mountain 1978, male, Shandong Shouguang, Jinan University Master Mechanical Engineering; Ma Yu Jian 1956, male, Shandong Zhangqiu, Jinan approximate think air nature constant, that does not change with temperature, sufficiently accurate solution available. In this case, the pressure can only consider the relative value according to the actual situation, quite far away from the fan outlet width compared with a fan outlet width is quite large, and quite far from the exit of the imaginary boundary, 29,10,12 13 is the New York border, you can set the static pressure is zero.
9,10,12,13 on the velocity component is zero.
Analysis. Based on the frequency 83 3-dimensional model.
Export 2 simulation using finite element analysis software benzoin 33 pairs of fan outlet velocity distribution simulation. The basic parameters are as follows blower fan Dimensions 1. Air member Zhen 2,5 3 constant density and viscosity coefficient was 1.81 51.8 father, inlet velocity is set to increase, the number of mine to visit the air for heart yang is the air density of ⑴ air velocity What is an air blower straight viscosity coefficient. The calculation shows that the Reynolds number is greater than 3 so air flow field turbulence model. In order to obtain more accurate results, use the mapped meshing, it is better able to maintain a constant mesh feature disabilities at the border.
2.1 establish that the 33 models and simulation and modeling 2.ll model unit 1.2 applied including speed Santos and Leli border strip Symphony boundary conditions imposed on the model. Consider the following boundary conditions into the rate applied evenly = inlet velocity perpendicular to the direction of the velocity component is zero, the speed of all the components of the boundary is zero, static pressure imaginary boundary 01 is zero, the 9 river 10,12,13 velocity component is zero.
2.1.3 Setting parameters bite knife to make 141 units to achieve a more realistic simulation results, the model mesh using mapped meshing law + mountain meshing method using a small ceremony 0 1 1 shuttle a few blocks are 141 A child analysis of air flow parameter settings include layer turbulence model selection iterations for convergence criteria and the relevant characteristics of the air. Results meshing.
2.1.4 Results After treatment of the results obtained, to give the speed and pressure of the fluid distribution outlet.
2.2 Simulation results and analysis of the variable speed including pressure, volume 3 kinetic energy from the mountains of the move by the convergence monitoring Bian Gang degree abscissa iterations convergence criteria ordinate position, next to solve a convergence monitoring the rate of change of goods north can be seen from the calculated variables reached naturalization convergence, variable results converge to solving complete.
6 for the fan outlet pressure curve, 7 fan outlet velocity vector. As can be seen from five flow field within the fan has not been fully developed. 6 can be exported by the negative sides of the low pressure, the center-right position appears positive position appears high negative low pressure vortex, is the high-pressure high-speed airflow occurs, which coincides with the velocity vector. 7 can be seen by the fan at the exit velocity gradient form a clear, since the presence of turbulent flow field, so left and right sides of the formation of a vortex outlet.
; Ytl This can be seen in the mouth of the fan pressure curve to verify.
The horizontal axis is the number of iterations, the vertical axis is the value of the horizontal convergence criteria for the export route, the vertical axis is the horizontal exit velocity for the export route, the vertical axis is the outlet pressure of 3 Conclusions. 8 software on the fan flow field 1 will be simulation, especially for fan outlet velocity distribution of the analysis and the results with the actual fundamental cause for the rational design of materials-dimensional flow field of wind turbine structural simulation analysis provides Shenqin basis.
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