压气机动态模型的建立及喘振过程分析

Establishment of a Dynamic Model for a Compressor and Analysis of the Surge Process

在SIMULINK环境中,建立了压气机动态数学模型。为了模拟压气机喘振和旋转失速现象,压气机特性图被延伸到负流量区域,还考虑到了气体通过压气机的延迟。模拟了压气机的喘振过程,并对压气机压力信号进行FFT变换,检测了压气机喘振。仿真结果表明:模型能预测压气机喘振过程中压力、流量和转速的振荡频率和振幅;压缩系统的转动惯量、稳压室容积等结构参数影响喘振特性;模型动态调节特性好,可用于压气机控制系统模型,具有广泛实用性。

In environment SIMULINK,a dynamic mathematical model for a compressor has been established.To simulate the compressor surge and rotating stall phenomenon,the characteristics chart of the compressor was extended to a negative flow zone with the time delay of gas passing through the compressor being taken into consideration.The compressor surge process has been simulated and the pressure signals of the compressor have undergone a fast Fourier transformation.The compressor surge has also been tested.The simulation results show that the model can forecast the oscillation frequencies of pressure,flow rate and rotating speed as well as relevant amplitudes during the compressor surge.Structural parameters such as the rotating inertia of the compressor system and the volume of the pressure stabilizing chamber etc.may influence the surge characteristics.The model displays good dynamic regulation characteristics and can be used for a compressor control system,offering benefits of a wider-ranging practical applicability.