Pressure pulsation widely exists in power machinery combining compression components and pipelines. It has substantial effects on the performance of compressor as part of the compression system, as well as the engine. In this paper, the pressure pulsations under different excitation frequencies are measured and analyzed in the intake system of a turbo-charged and inter-cooled internal combustion engine. It is pointed out that the amplification of the pressure pulsation at the compressor inlet and outlet is caused by the coupling effects within the compression system, which consequently lead to the formation of a stable standing wave. Further research indicates that the pulsation at the compressor boundary will cause its pressure ratio to fluctuate. Additionally, because the compressor characteristic curve resembles a concave function, the fluctuation of transient pressure ratio will further cause the time-averaged pressure ratio to decline. Finally, the impact on engine performance is evaluated based on a well-validated simulation model.

压力脉动广泛存在于压缩元件和管道组合的动力机械中。它对作为压缩系统一部分的压缩机以及发动机的性能产生重大影响。本文对涡轮增压中冷内燃机进气系统中不同激励频率下的压力脉动进行了测量和分析。指出压气机进出口压力脉动的放大是由压缩系统内部的耦合效应引起的，从而导致形成稳定的驻波。进一步研究表明，压缩机边界处的脉动会导致其压比波动。此外，由于压缩机特性曲线类似于凹函数，瞬态压比的波动会进一步引起时均压比的下降。最后，基于经过充分验证的仿真模型评估对发动机性能的影响。