The importance of pseudo-slug flow research is becoming increasingly prominent in the petrochemical field. But the gas–liquid two-phase flowrate measurement in the pseudo-slug flow has not been properly understood and modeled. Based on the differential pressure of Venturi, this study proposes a new pseudo-slug flowrate prediction model. By means of Fast Fourier transform (FFT), the representative frequency range (3.125 Hz < f < 6.25 Hz) is determined. Then, the fourth detail component of the differential pressure after wavelet transform is selected as the flag to distinguish the liquid film region and the pseudo-slug body region. Based on the gas–liquid density ratio, a logarithmic model is established to predict the threshold value. In the liquid film region, the gas–liquid two-phase flow is regarded as wet gas and the flowrate is measured through the over-reading model. In the pseudo-slug body region, the volume gas holdup model is established based on the fluctuation information of the differential pressure. Then the gas–liquid two-phase flowrate can be obtained by solving the Bernoulli equation. Compared to the experiment, the confidence probability of ±10% relative deviation band is 97.78% for the gas, and the confidence probability of ±20% relative deviation band is 95% for the liquid.

假团流研究的重要性在石化领域变得越来越突出。但是，对-气中气液两相流量的测量还没有被正确地理解和建模。基于文丘里管的压差，本研究提出了一种新的假团流量预测模型。通过快速傅立叶变换（FFT），代表频率范围（3.125 Hz <  f 确定<6.25 Hz）。然后，选择小波变换后的压差的第四细节分量作为标记以区分液膜区域和伪pseudo体区域。基于气液密度比，建立对数模型以预测阈值。在液膜区域，气液两相流被视为湿气，并通过超读模型测量流量。在准-体区域中，基于压差的波动信息建立体积气体滞留率模型。然后可以通过求解伯努利方程获得气液两相流量。与实验相比，该气体的±10％相对偏差带的置信度为97.78％，