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针对航空发动机中转静干涉流场诱发的叶盘结构强迫响应问题,分析由导流叶片和动叶构成的转静干涉流场的尾流激励所激起的叶盘结构高阶共振的可能性和危险性.基于非定常转静干涉流场数值模拟结果,通过时域与空间傅里叶分析得到叶盘所受气动压力的频谱和空间波谱,同时定义投影于叶盘结构模态空间的激励(即模态力)为尾流激励的可激性,用于对叶盘结构共振响应强度的评估.研究结果表明:尾流激励对非主要共振点的可激性远远小于其对主要共振点的可激性;在发动机工作转速范围内允许那些模态位移场与激振力场的夹角较大(余角较小)的共振存在,即尾流激励可激性很小的高阶共振的存在是合理的.
In view of the forced response of leaf disc structure induced by static interference flow in aeroengine, the possibility of high-order resonance of leaf disc structure induced by the wake excitation of the static interference flow field formed by the guide vanes and moving blades is analyzed. Based on the results of numerical simulation of unsteady flow and static interference flow field, the spectrum and the spatial spectrum of the aerodynamic pressure on the leaf disc are obtained by time-domain and spatial Fourier analysis. At the same time, the excitation ( That is, the modal force) is the excitability of the wake excitation, which is used to evaluate the resonant response of the leaf disc structure.The results show that the excitability of the wake excitation to the non-main resonance point is far less than that of the main resonance point Of the excitability; in the engine speed range of motion that allows those modal displacement field and the excitation force field angle (smaller corner) resonance exists, that wake excitation excitations high-order resonance The existence of is reasonable.