摘要
本文叙及了利用双能γ射线系统测量多相流相含率的基本原理及数学算法．射线系统由同位素241^Am和137^Cs组成，它们发射出的光子能量分别是59．2keV和662keV．文中提出了三种确定射线吸收系数的方法，并通过实验证明了拟合是最合理的方法．同时，在假定射线吸收系数已经准确确定的前提下，分析了由于射线光子发射的随机性所造成的水和油的测量误差。这种测量方法的优点是在相含率的测试过程中与流态无关．实验结果表明该方法用于测量多相流相含率是可行的。
This article describes the principle and the mathematical method of using the dual-energy gamma-ray attenuation to measure the phase fraction in multiphase flow. The dual-energy gamma-ray device is composed of radioactive isotopes of 241^Am and 137^CS which have the emission energies 59.5keV and 662keV respectively. There are three ways to get the absorption coefficient in measuring phase holdup in multiphase flow with dual-energy gamma-rays. A rational method for calibrating the absorption coefficient is introduced in detail. The statistical error is analyzed while the base of the absorption coefficient is rational. This enables the phrase fraction to be determined almost independent of the flow regime. Improvement is achieved on the accuracy of measurement of phase holdup. The dual-energy gamma-ray system has been applied to determine the water, oil and gas phase fraction in three-phase pipe in order to show the possibilities of this measuring technique.
出处
《中国造船》
EI
CSCD
北大核心
2005年第B11期273-279,共7页
Shipbuilding of China
关键词
双能伽马射线
吸收系数
相含率
误差分析
dual energy gamma-rays
absorption coefficient
phase fraction
error analysis
