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

作　　者：姬忠涛[1,2] 田德 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]曲靖师范学院物理与电子工程学院,曲靖655011

出　　处：《农业工程学报》2016年第11期98-102,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(59776033)

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。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

关 键 词：风能 模型 流场 材料 浓缩风能装置 流固耦合 有限元 有机玻璃 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]