Study On The Data Processing And Mechanism Modeling Of The Wet Gas Meter

Gas-liquid two-phase flow widely exists in the modern industry, but the technology of flow pattern identification and flow measurement has been a international problem which is no good solution. The researchers both at home and abroad carried out a wide range of research and exploration. The Department of Automation of China University of Petroleum (East China) developed a new wet gas flow meter based on Slotted orifice which is low-cost. Now its hardware design has been completed. And carried out the interior and on-site experiments, and achieved a great deal of experimental data. On this basis, the paper studies the existing experimental data to improve the performance of wet gas meter.This thesis consists of two parts. The first part is using wavelet packet and auto-correlation to filter the noise in the experimental date, and improving this method by comparing auto-correlation curve of wavelet packet reconstruction after decomposition of the signal with white noise to improve the accuracy of de-noising.The second part is to derive the volume equation of two-phase flow from the basic principles of fluid mechanics and in-depth understanding of a variety of two-phase flow model by the experimental data. The equation which contains gas and liquid Bernoulli equation and the interaction of gas and liquid, considers the impact of slip ratio fully. Considering each separated flow model and its equation to further improve on the above equation. Experimental data is derived into the model, and solute the equation to gain the slip ration. These slip ratios have no significant differences, so this thesis selected the result by the model based on the model of Lin Zonghu as an example to carried out the next step. And compared above result and the existing experience formula of slip ratio. On this basis, studied on the characteristics of the slip ratio in-depth, found: whenβ<0.97, the slip ratio does not change with the increasing of gas volume fraction; whenβ>0.97, the slip ratio increases rapidly with the increasing of gas volume fraction. The slip ratio reduces with the increasing of aperture ratio. Classifing the slip ratio by Froude number, studied on the relation between slip ratio and differential pressure or Lockhart-Martinelli parameter respectively.