|Alternative Title||Research on Traveling Wave Wall Flow Control Based on Magnetic Induction Flexible Film
|Place of Conferral||兰州
首先，本次研究制作了以聚二甲基硅氧烷 (PDMS) 为载体，Fe3O4微颗粒为功能性填充物，采用模具控制-加热固化的制备方法得到了力学性能稳定、磁化性能高的的磁感应柔性薄膜。
其次，对制备的 PDMS-Fe3O4磁感应柔性薄膜进行了轴向拉伸破坏实验。实验结果表明，本次研究制备的 PDMS-Fe3O4磁感应柔性薄膜相比纯 PDMS 抗拉强度下降程度在 5%左右，弹性模量随着 Fe3O4浓度提高不断提升，当 Fe3O4浓度为 2 g/ml 时弹性模量达到纯 PDMS 弹性模量的 1.639 倍。
随后，在构建了以 PDMS-Fe3O4磁感应柔性薄膜作为元件，磁场作为驱动方式的行波壁激励装置后，设计了基于 Matlab 的行波壁实时监测装置，将单元的变形效果实时反馈至计算机。通过将行波壁激励装置与行波壁实时监控装置结合在一起形成了磁驱动行波壁流动控制系统。该系统具有制作成本低，占用空间小，系统响应快 (～200 Hz)，可实时监测的优点，为行波壁流动控制的自动化应用提供新的发展潜力。
最后，通过数值模拟和实验相结合的方式对此行波壁流动控制系统性能进行了研究。由检测结果可知，当选用 Fe3O4浓度为 1 g/ml 的柔性薄膜时位移可达 19.85 mm/m，同时行波壁实时监测装置在激励周期为 50 ms 时监测到最大位移的命中率达到了 85%。|
|Other Abstract||Most conventional traveling wave wall flow control method mostly uses electric or mechanical drive to drive the entire device to input energy to the flow field and achieve active flow control. However, the current driving method of traveling wave wall has limitations such as large equipment occupation, high manufacturing cost, and slow system response speed , which limits the application development of active flow control to some extent. Based on the above problems, this topic adopts magnetic field driving as the driving method, and prepared a magnetic induction composite material as a traveling wave wall output control system component. The electromagnetic generation system unit controls the phase and strength of the magnetic field, and then uses computer feedback to coordinately control the magnetic induction composite material. The deformation of the traveling wave wall is output, and the components are deformed to achieve active control of the traveling wave wall flow field. After optimized design, this method has the advantages of small equipment footprint, low materialmanufacturing cost, and rapid system response.It provides a new solution for the large-scale application of traveling wave wall flow control to practical applications.Thespecific research contents of this article are as follows:
First of all, in this study, a PDMS-Fe3O4 magnetic flexible film with PDMS as the matrix and ferroferric oxide microparticles as the filler was produced. The mold-controlled heating curing method was used to obtain stable mechanical properties and high magnetization magnetic
Then,thetensilefailureexperiment of the prepared PDMS-Fe3O4 magnetic induction flexible film was carried out. The experimental results show that the PDMS-Fe3O4 magnetic induction flexible film prepared in this study has a tensile strength decrease of about 5% compared to pure PDMS.With the increase of Fe3O4 concentrationand, the elastic modulus continues to increase. When the Fe3O4 concentration is 2 g / ml, the elastic modulus reaches 1.639 times that of pure PDMS.
Subsequently, while constructing a traveling wave wall excitation device usingPDMS-Fe3O4 magnetic induction flexible film as the element and a magnetic field as the driving method, a real-time monitoring system device device based on Matlab was designed. The deformation effect is fed back to the computer in real time. By combining the traveling wave wall excitation device and the traveling wave wall real-time monitoring device, a magnetically driven magnetic induction film driven traveling wave wall flow control system is formed. The system has the advantages of low production cost, small space occupation, fast system response(~ 200 Hz), and real-time monitoring, and provides new development potential for the automated application of traveling wave wall flow control.
Finally, the performance of this traveling wave wall flow control system was studied through a combination of numerical simulation and experiment. It can be seen from the test results that when the flexible film with Fe3O4 concentration of 1 g / ml is selected, the displacement can reach 19.85 mm / m, and the probability of the maximum displacement detected by the traveling wave wall real-time monitoring device when the excitation period is 50ms reaches 85%.|
|First Author Affilication||School of Civil Engineering and Mechanics
塔伊尔江.图尔荪托合提. 基于磁感应柔性薄膜驱动的行波壁流动控制研究[D]. 兰州. 兰州大学,2020.
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