当前用于系统仿真的文氏管模型过于简单,而考虑两相流的CFD模型却难以集成到发动机系统仿真中,通过综合采用数值计算、实验验证、系统辨识的方法,建立了一种适用于系统仿真的4阶文氏管动态模型。计算表明:即使在汽蚀状态下,文氏管也可能出现3.3%的流量波动,而不是所谓的恒定流量源。因此,该模型将有利于提高发动机系统仿真的可靠性。 At present, the Venturi model used for system simulation is too simple. However, considering the CFD model of two-phase flow, it is hard to be integrated into the simulation of engine system. Through the integrated numerical calculation, experimental verification and system identification, The 4th order venturi dynamic model of system simulation. Calculations show that the venturi may fluctuate by 3.3% even at cavitation, rather than the so-called constant flow source. Therefore, this model will be helpful to improve the reliability of engine system simulation.