Correcting method aiming at CT ray hardening in multi-phase flow system

Abstract

The invention provides a correcting method aiming at CT ray hardening in a multi-phase flow system, which comprises the following steps: 1) using fluid dynamics software to generate a simulated flow field of the multi-phase flow system; 2) selecting one two-dimensional section of the simulated flow field to acquire flow field data of the two-dimensional section; 3) selecting materials and thicknesses of different filter plates, and simulating a process of scanning the two-dimensional section by CT to acquire simulated two-dimensional reconstructed images corresponding to the materials and thethicknesses of the different filter plates respectively; and 4) determining the materials and the thicknesses of the filter plates required during actual CT measurement according to the similarity ofthe simulated two-dimensional reconstructed images and the simulated flow field data. The correcting method has the advantages that the defect that the precise repeatable flow field cannot be producedin a physical experiment can be overcome by combining computational fluid mechanics and CT simulation; and the hardening correcting parameters of a CT system can be determined through computer simulation so as to save a large amount of manpower, materials and financial resources.

Description

technical field [0001] The invention belongs to the technical field of multiphase flow measurement, and in particular, the invention relates to a method for obtaining correction parameters of CT radiation hardening. Background technique [0002] Multiphase flow widely exists in industrial production. The multiphase flow system is a typical complex system, and its internal heterogeneous structure has multi-scale characteristics. Under the condition far from equilibrium, the slight change of the operating parameters not only affects the micro-scale structure, but may also cause the macro-scale structure of the whole system to change. The dramatic changes have greatly affected the performance of the reactor. In-depth research and control of multiphase flow devices requires reliable experimental data as the basis, among which, the measurement of material concentration distribution in the device cross-section is an important content. [0003] At present, the commonly used multi...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the hardening correction parameters cannot be determined quantitatively when CT is applied to multiphase flow measurement, the present invention proposes a computer simulation of multiphase flow field and CT scanning to quantitatively determine the hardening correction parameters of the multiphase flow field as the scanning object. Save a lot of manpower, material and financial resources for the design and development of CT

Images