文档介绍：内蒙古科技大学硕士学位论文 2 - - Abstract The gas/liquid two-phase flow is widespread in nature and indus trial processes. The measurement of parameters of gas/liquid two-phase flow ,such as velocity, size and position of bubbles is a very important investigation subject. Gas/liquid two-phase cross-co rrelation flow velocity measurement system is composed of the upper and under ultrasonic sensors which change the flow noise signal into electrical signals , th rough the amplification, filtering,A/D converter circuit and the digital signal will be sent cross correlator. Finally output is the transit time and the velocity. In this paper,the anthor studied in detail the random ultrasonic pulse signal detection bined with the cross-correlation flow measurement techni que to give the gas phase velocity and the bubbly flow distribution,the specific work is as follows: academic foundation and implementati on means are systematically introduced about the discrete phase veloci ty measurement by using the ran dom ultrasonic pulse signal detection bined with the cross-correlation flow measurement technique. 2. The two-phase flow is a plex multi-dimensional random phenomenon, Gas/liquid two-phase bubbly flow is simula ted by use of the Monte Carlo method. 3. By use of normalized cros s-correlation,differential au to-correlation and polarity correlation algorithms,the pleted well two-phase flow velocity measurement. 4. Through the simulatio n, the author analysised some im pact factors of the velocity measurement. The research results show that simula tion two-phase bubbly flow by Monte-Carlo method is a reasonable and eff ective way to promote the flow measurement technology in- depth verification of three algorithms can achieve two-phase bubbly flow velocity measurements . In relation to th e industrial field of gas/liquid two-phase flow and flow rate measurement, the research results of this pape r has theoretic