论文部分内容阅读
通过ANSYS软件建立2个同心圆柱壳以及在同心圆柱壳之间的静水模型,对其流固耦合模态特性进行分析。对圆柱壳和静水分别采用Solsh190和Fluid30单元进行网格划分,忽略流体的粘性和可压缩性的影响,通过有限元计算得到同心圆柱壳之间含静水的流固耦合模型的固有频率,分析静水间隙对其固有频率的影响。计算结果表明,随着静水间隙减小,固有频率亦随之减小;用ANSYS Fluid30模拟小间隙静水,间隙g≥1.5 mm且动能雷诺数Rk≥1478时,计算结果误差小于20%。
The two concentric cylindrical shells and the hydrostatic model between concentric cylindrical shells were established by ANSYS software to analyze the fluid-structure coupling modal characteristics. Solsh190 and Fluid30 are used to mesh the cylindrical shell and hydrostatic water respectively, neglecting the influence of viscosity and compressibility of the fluid, the natural frequencies of the fluid-structure interaction model with static water between the concentric cylindrical shells are calculated by finite element method, The influence of gap on its natural frequency. The calculated results show that the natural frequency decreases with the decrease of the hydrostatic clearance. When using ANSYS Fluid30 to simulate the small gap hydrostatic water, the error of the calculated result is less than 20% when the gap g≥1.5 mm and the kinetic energy Reynolds number Rk≥1478.