为了探索弹丸飞行时MEMS射流发电机气道中压电振子在气流作用下的运动情况,对发电机的流场和压电结构部分的流固耦合问题进行了理论分析与数值模拟,采用有限元法,利用ANSYSWorkbench和CFX及ANSYSFLOTRAN相结合的算法实现流体分析和结构分析的单向流固耦合计算和双向流固耦合计算,并对两种流固耦合方法进行了分析和比较,最后得出在高速气流驱动下固体结构的变形相对较大,导致流场的边界形貌发生了相对较大的改变,宜采用双向流固耦合的办法进行仿真分析。

In order to explore the movement of piezoelectric vibrator in the airway when projectile flying, in this paper, we do a theoretical analysis and numerical simulation for the flow and structure part of the generator's fluid-solid coupling problem. In order to obtain the deformation of structural elements, using the method of finite element and fluid-solid interface in ANSYS and CFX, single-coupling and inter-coupling calculation of structural and fluid analysis was realized, and the two fluid-structure interaction methods are compared, finally obtained in the high-speed air-driven deformation of the solid structure of relatively large, leading to shape the boundaries of the flow field had a relatively large change in distribution of flow field, should adopt the two-way fluid-solid interface approach to simulation.