姬忠涛, 田德. 有机玻璃材料的浓缩风能装置流固耦合分析[J]. 农业工程学报, 2016, 32(11): 98-102. DOI: 10.11975/j.issn.1002-6819.2016.11.014
    引用本文: 姬忠涛, 田德. 有机玻璃材料的浓缩风能装置流固耦合分析[J]. 农业工程学报, 2016, 32(11): 98-102. DOI: 10.11975/j.issn.1002-6819.2016.11.014
    Ji Zhongtao, Tian De. Fluid-solid coupling analysis of wind-energy concentration devices with organic glass[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2016, 32(11): 98-102. DOI: 10.11975/j.issn.1002-6819.2016.11.014
    Citation: Ji Zhongtao, Tian De. Fluid-solid coupling analysis of wind-energy concentration devices with organic glass[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2016, 32(11): 98-102. DOI: 10.11975/j.issn.1002-6819.2016.11.014

    有机玻璃材料的浓缩风能装置流固耦合分析

    Fluid-solid coupling analysis of wind-energy concentration devices with organic glass

    • 摘要: 用于制造浓缩风能装置的材料直接影响浓缩风能型风力发电机的推广及应用。该文通过流固耦合分析方法,对有机玻璃用于制造浓缩风能装置的可能性进行分析。采用计算流体力学(computational fluid dynamics,CFD)软件对浓缩风能装置在特定风场下进行仿真模拟,得到了不同温度下浓缩风能装置所处流场的风速和风压分布。将不同温度下的流场计算风压分布结果作为载荷加载到对应温度下的浓缩风能装置上,得到该装置在不同温度下所受最大应力。这些不同温度下的最大应力均远小于有机玻璃在对应温度下的断裂应力,如温度为293.15 K时该装置所受最大应力为1.5378 MPa,而该温度下有机玻璃的断裂应力为71.704 MPa,因此有机玻璃在强度上满足浓缩风能装置要求,可以用于制造浓缩风能装置。当选择泊松比、杨氏模量和断裂应力均随温度发生变化的材料作为流体机械备选材料时,该研究过程可以为其可行性研究提供参考。

       

      Abstract: The concentrated wind energy device is the core of the wind energy concentration generator, so the material choice of the former can influence directly the widespread application of the latter. This research adopts a fluid-solid interaction (FSI) method to study the viability of using organic glass to manufacture concentrated wind energy devices. The Poisson's ratio, Young's modulus and fracture stress of organic glass change with the temperature. Therefore, the wind pressure distribution on the surface of the concentrated wind energy device is worked out when air flows at the speed of 25 m/s at different temperatures under normal atmospheric pressure. Then, the maximum equivalent stress and the maximum deformation can be also worked out when the wind pressure distribution is loaded on the concentrated wind energy device at the corresponding temperature. So at first, a solid-field model of a concentrated wind energy device is created based on the size of the model by using the computer aided design (CAD) software. And the solid-field model is imported into the finite element analysis software and a cylinder is established, and the cylinder and the solid field have the same axial line. The radius of the cylinder is 10 m and the height is 30 m. The distance between the inlet of the fluid-field area and the bottom surface of the concentrated wind energy device is 5 m. Then through Boolean subtraction method, a geometric fluid field is established by subtracting the solid field area in the cylinder. With the help of the computational fluid dynamics (CFD) software, the fluid field is simulated and calculated in a specific wind field. A non-uniform tetrahedron meshing and an SST k-ω turbulence model are adopted. The fluid medium is air and the pressure is always 101325 Pa. The temperatures are 233.15, 243.15, 253.15, 263.15, 273.15, 283.15, 293.15, 303.15 and 313.15 K respectively. The density, the thermal conductivity coefficient, the constant-pressure specific heat capacity and the viscosity correspond to the pressure of 101325 Pa and the temperature. And the mass flow rate, turbulent kinetic energy and specific dissipation rate can be calculated from the density, viscosity and size of fluid field. When the temperature is 293.15 K, the density, viscosity, thermal conductivity coefficient, constant-pressure specific heat capacity, mass flow rate, turbulent kinetic energy and specific dissipation rate are respectively 1.2054 kg/m3, 1.86×10-5 kg/(m?s), 0.02593 w/(m?K), 1013 J/(kg?K), 9464.048 kg/s, 0.686 m2/s2 and 24 /s. The mass flow inlet and pressure flow outlet are adopted. The surface roughness height of the concentrated wind energy device is set to 0.3 mm. When the component residual reaches 1.0×10-4 kg/s, the equation converges and the distribution of the wind speed and wind pressure in the fluid field under different temperatures are obtained. The diagram of wind speed distribution shows that, when the temperature is 293.15 K, the average wind speed inside the central cylinder exceeds 25 m/s. This indicates that the concentrated wind energy device has increased wind speed and concentrated the energy. In the structural static module, the solid field, as a whole, is split into tetrahedral meshes, and the size of the structural unit is 0.005 m. When the calculated results of the fluid field are loaded on the concentrated wind energy device, the stress cloud plot and the solid-field deformation plot are obtained. The plots show that, when the temperature is 293.15 K, the maximum stress is on the back of the outer edge of the shrinkable pipe, with a maximum stress of 1.5378 MPa, far less than the fracture stress of candidate organic glass of 71.704 MPa. And the maximum equivalent deformation is 3.0995 mm. Therefore, it is concluded that organic glass can be used as the material of the concentrated wind energy device. Meanwhile, the analytical process can provide the references for the analysis of probability of producing concentrated wind energy devices with the material whose mechanical properties change with temperature change.

       

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