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在封闭水流槽道中央,上游布置一刚性方柱,下游弹性薄板的一端固定在方柱尾端,弹性薄板上端、下端和另一端自由。上游方柱绕流后在下游形成周期性扰动流场,进而诱发下游弹性薄板的连续振动。数值模拟结果表明,当周期性扰动流场与结构形成强烈的非线性耦合作用时,近壁区流动进一步受板扰动的影响,流动的边界条件发生改变,流场对称结构遭到破坏,形成不同尺度的涡旋流动,同时弹性薄板表现出非周期、非对称的耦合振动行为。
In the middle of the closed flow channel, a rigid square column is arranged upstream, one end of the downstream elastic sheet is fixed at the tail end of the square column, and the upper end, the lower end and the other end of the elastic sheet are free. The upstream square column flows downstream to form a periodic disturbance flow field, which in turn induces the continuous vibration of the downstream elastic sheet. Numerical simulation results show that when the periodic perturbation flow field and the structure form a strong nonlinear coupling, the flow in the near wall is further affected by the plate disturbance, the boundary conditions of the flow change, and the symmetry structure of the flow field is destroyed and formed differently Scale vortex flow, at the same time elastic sheet shows aperiodic and asymmetric coupling vibration behavior.