气液两相流动噪声特性及相含率测量模型

Noise characteristics and volume fraction measurement model of two-phase gas-liquid flow

为了研究气液两相流噪声信号特性与体积相含率测量,采用多孔网与多孔孔板相结合的方法,设计了一种适合气液两相流动的噪声发生装置,运用CFD仿真优化设计了新型多孔孔板相含率测量装置,通过在管内设置多孔孔板阻流件,快速调整流场至平衡状态,突出噪声信号,以达到准确测量气液两相相含率的目的。利用声发射技术对流动噪声进行了探测,在河北大学气液两相流测试系统上进行了大量的实验测试,并运用现代信息处理方法对流动声发射信号进行了提取及分析,建立了泡状流、弹状流及过渡流型下气液两相流体积相含率测量模型,测量模型拟合体积含液率相对误差绝对值均低于4.8%。

A noise-generating device suitable for two-phase gas-liquid flow was designed by combining a porous mesh with a porous plate. The device was used to study the noise signal characteristics of two-phase gas-liquid flow and to measure volume fraction. A novel device for the measurement of the volume fraction of porous hole plates was designed through CFD simulation. The flow field was rapidly adjusted to the equilibrium state, and the noise signal was outburst by installing the porous orifice plate in the tube to enable the accurate measurement of the gas-liquid volume fraction. Flow noise was detected by using acoustic emission technology. Numerous experiments were performed by using the two-phase gas-liquid flow test system of Hebei University, and the flow acoustic emission signal was extracted and analyzed by applying the modern information processing method. The measurement models of the volume fraction of two-phase gas-liquid flow under bubbly, sluggish, and transition flow patterns were established. The absolute value of the relative error of the volume fraction was less than 4.8%.