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基于能量法原理,采用弱耦合的方法对跨声速风扇叶片进行气弹稳定性分析;采用3维线性插值算法编程实现CSD/CFD数据交换。利用有限元法计算叶片的模态振型和固有振动频率;应用FLUENT动网格技术,对NASA R 67风扇叶片在不同模态振动下的非定常流场进行数值模拟,给出在前3阶模态振动下叶片表面的周期累积气动功和气动阻尼,并探讨了激波对跨声速风扇叶片气弹稳定性的影响。
Based on the principle of energy method, the weak-coupling method is used to analyze the aeroelastic stability of transonic fan blades. The CSD / CFD data exchange is realized by 3-dimensional linear interpolation algorithm programming. The mode shapes and the natural frequencies of the blade were calculated by the finite element method. The unsteady flow field of the NASA R 67 fan blade under different modes vibration was numerically simulated by FLUENT moving grid technique. The periodic aerodynamic and aerodynamic damping of the blade surface under modal vibration was also investigated. The effect of shock wave on the aeroelastic stability of transonic fan blades was also discussed.