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采用频率法对气液同轴喷嘴缩进室内气液两相流动态特性进行了分析.采用均相流模型,在把液相介质参数看作集中参数的条件下讨论了缩进室边界压降振荡对液相质量流量振荡的动态响应.通过对模型喷嘴算例编程进行计算,结果表明:随着扰动频率的增加,缩进室两端压降振荡的振幅增大,压降振荡与液体流量振荡之间的相位差也增大.较小长径比的缩进室以及较小的液体喷嘴质量流量、大气液比和高反压可以抑制缩进室边界压降振荡.
The dynamic characteristics of gas-liquid two-phase flow in gas-liquid coaxial nozzle retracted in-house are analyzed by using frequency method.Using the homogeneous flow model, the pressure drop of the indentation chamber is discussed under the condition that the liquid medium parameter is regarded as the concentration parameter The results show that as the disturbance frequency increases, the amplitude of the pressure drop oscillation at both ends of the chamber increases, and the pressure drop oscillation and liquid flow rate The phase difference between the oscillations is also increased.The smaller aspect ratio of the retreat chamber and the smaller liquid nozzle mass flow rate, the atmospheric liquid-liquid ratio and the high backpressure can suppress the pressure drop oscillation at the indentation boundary.