近年在微小型涡喷/涡扇发动机、涡轮增压系统以及燃料电池等国家战略布局领域，离心压气机成为综合考虑运行安全性、经济性与环境适应性等因素下最优选择之一。由于离心压气机突尖型先兆在时域上的突然性与瞬时性，以及在空间上的局部性，除了耗时的非定常数值计算，至今尚无其他捕捉扩压器突尖失速方法，使得突尖失速的预测成为当前压气机设计的核心需求与前沿问题。同时，当前压气机流动控制策略设计中实现最优扩稳效果的方法为低效的试错，缺少流场对外部激励响应特性的定量衡量标准。因此，本项目拟采用现代流体力学新兴的非正交模态分析方法，突破现有正则模分析的框架，捕捉小时间尺度内扰动的非线性演化，从而实现突尖失速的物理数学描述与准确预测。同时，将现有稳定性研究拓展至敏感性研究，揭示影响压气机稳定性的关键流场激励与源发空间位置，有助于改善当前压气机扩稳方案设计的低效问题，为建立压气机最优控制策略的设计原则提供重要理论依据。

Recently in the micro turbojet/turbofan engine, turbocharger and fuel cell vehicle, centrifugal compressor becomes the primary choice regarding operation stability, economy and adaptation. Considering the transient feature of temporal nature and regional feature in spatial domain of the spike stall inception in vaned diffuser, none mature approach is available for spike inception prediction other than unsteady numerical simulation. This situation makes the prediction of spike inception the crucial requirement and frontier problem in modern compressor design. Meanwhile, the main method to realize the optimal flow control technique is through multiple trials and errors. And the qualitative standard to evaluate the receptivity of flow field to external excitations is in lack, which inevitably leads to inefficiency in designing the flow control strategy. Therefore, the non-normal analysis, which is an emerging approach in seeking the underlying mechanism of fluid, is employed in the present study. And the transient behavior and nonlinear development of small time scale perturbation is captured by breaking through the existing framework of modal stability analysis. Then the spike-type inception in centrifugal compressor can be predicted accurately and described mathematically. Moreover, the stability analysis is expanded into sensitivity analysis. The receptivity of flow field to external excitation and origin spatial location can be obtained. With the help of sensitivity analysis, the problem of inefficiency in flow control strategy design can be solved. And the principle for optimal strategy design can be guided.