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通过风洞试验测试了单箱的颤振性能,基于流固松耦合的计算策略和动网格技术,应用计算流体动力学(CFD)的方法,模拟了单箱的颤振过程,并采用相位平均的方法研究了颤振临界状态下模型尾部旋涡的演化规律,研究结果表明模型尾部风嘴上下侧旋涡的交替作用对结构周期性振动产生较强的驱动作用。利用分块分析的思路研究颤振过程中气流能量在模型表面不同区域的输入特性,以及模型尾部旋涡的演化规律对模型表面气动力空间分布和气流能量输入特性的影响。分块分析的结果表明单箱发生颤振时将通过迎风端风嘴从气流中吸收大量的能量,并且在一个完整的振动周期内气流输入到振动系统的能量不断增加,造成单箱的颤振多为结构稳定性的突然丧失。
The flutter performance of single box was tested by wind tunnel test. Based on the fluid-solid coupling method and the moving grid technique, the CFD method was used to simulate the flutter of single box, and the phase The average method is used to study the evolution of the vortex at the tail of the flutter in the critical state. The results show that the alternation of vortices on the upper and lower sides of the tuyere at the tail of the model has a strong effect on the periodic vibration of the structure. Using the idea of block analysis, the input characteristics of airflow energy in different regions of the model surface during flutter and the evolution of the vortex at the tail of the model are investigated to study the effects of the aerodynamic force on the model surface and the input characteristics of airflow energy. The results of the block analysis show that when the single box flutter occurs, a large amount of energy will be absorbed from the airflow through the windward nozzle, and the energy input to the vibration system by the airflow during a complete vibration cycle is continuously increased, resulting in a single box flutter Mostly a sudden loss of structural stability.