Measurement And Analysis Of Continuous Liquid Phase Characteristics In Gas-liquid Two-phase Flow

Gas-liquid two-phase flow is the most common form of multiphase flow.Multiphase flow research in energy,water conservancy,chemical industry,metallurgy and other industrial departments,as well as meteorology,biology,aerospace and other fields have a wide range of practical application value.Annular flow is a typical form of gas-liquid two-phase flow,which has small liquid film flow,low power consumption,high mass transfer coefficient and high heat flux.It is applied to heat dissipation,safe operation of equipment,improve the efficiency of heat and mass transfer,reduce heat loss and improve transportation efficiency.In this paper,high speed photography is the main method.With laser induced fluorescence method and technology of combining virtual binocular stereo vision system,the characteristic parameters of the continuous liquid phase flow in gas-liquid two-phase flow were measured and analyzed.Specific work includes the following content:1.The common forms of gas-liquid two-phase flow,the application environment and application value of gas-liquid two-phase flow,and the measurement technique for multiple characteristic parameters of gas-liquid two-phase flow are summarized in this paper.The research on the gas-liquid two-phase flow at home and abroad has been introduced.2.For the measurement of the characteristic parameters of the axial liquid membrane,the method of camera calibration is studied,and the relationship between the coordinate system is determined.Based on digital image processing technology,analysis of the film images collected by the ambient light and laser induced fluorescence method can effectively improve the accuracy of the measurement of the axial liquid film thickness.3.To measure the characteristic parameters of the pipeline,the virtual binocular stereo vision system is introduced,and the circumferential flow of the pipeline is effectively reduced by the double angle measurement and digital image processing.The measuring principle of the virtual binocular stereo vision system is analyzed,and a simplified mathematical model is established.And based on the processing technology of image fusion and fusion algorithm is studied.4.Combined with virtual binocular stereo vision system and laser induced fluorescence method,the experimental study on stratified flow fluctuations in horizontal pipe and annular flow in vertical downward pipe.Based on the image fusion method,the axial image of the pipeline is effectively reconstructed,and the thickness of annular flow liquid film is calculated.