在多级压缩等实际应用场景中，离心压气机常面临上游设备引发的非定常脉冲进气，当前针对该情形下压气机动态响应的系统性研究较少。为此，本研究基于自主搭建的非定常进气离心压气机试验平台，设计了可调节频率与振幅的流量进气脉冲发生装置，针对40 000 r/min转速工况，系统开展了脉冲进气条件下压气机气动特性的试验研究，分析了脉冲频率和振幅对压气机瞬态响应及时均性能的影响规律。结果表明：脉冲进气下，压气机瞬态压比流量特性呈现闭合的细长型迟滞环，脉冲频率主要影响迟滞环形状与斜率，脉冲振幅则决定迟滞环尺寸，且非定常度随振幅增大单调升高；时均性能方面，大流量工况下脉冲进气会降低压比，且瞬态非定常度越高，时均性能恶化越明显，而小流量工况下，时均性能则趋近稳态特性。

In practical application scenarios such as multi-stage compression, centrifugal compressors often face unsteady pulsating inlet flow induced by the upstream equipment, while the systematic research on the dynamic response of compressors under this condition is relatively scarce. Based on a self-developed experimental platform for centrifugal compressors under unsteady inlet conditions, a flow pulse generator with adjustable pulse frequency and amplitude was designed. For the operating condition of 40 000 r/min, a systematic experimental investigation on the aerodynamic characteristics of a centrifugal compressor was carried out under pulsating inlet conditions, and the influence of pulse frequency and amplitude on the compressor transient response and time-averaged performance were studied. The results show that the transient pressure ratio-flow characteristics of compressor under pulsating inlet conditions exhibit closed slender hysteresis loops. The pulse frequency mainly affects the shape and slope of loop, while the pulse amplitude determines the loop size, and the unsteadiness increases monotonically with the amplitude. In terms of time-averaged performance, pulsating inlet flow reduces the compressor pressure ratio under high flow conditions, and the higher the transient unsteadiness, the more pronounced the deterioration of time-averaged performance. Under low flow conditions, the time-averaged performance approaches the steady-state characteristics.