不同节流装置测量气液两相流的动态特性研究

Research on the dynamic characteristics of gas-liquid two phase flow measurement with different throttle devices

为了研究文丘里管、多孔孔板和V型内锥3种功能节流式流量计测量得到的气液两相流动态特性,采用高频差压传感器获取不同流型下的动态差压信号,利用AOK时频谱对差压信号进行分析,通过时频谱图研究不同流型下信号的时变特征。通过对典型的泡状流、弹状流、塞状流信号的实验分析表明:文丘里管在塞泡流存在较强的噪声信号,V型内锥在泡状流存在较强的噪声信号。多孔孔板具有很好的降噪效果,且多孔孔板能均衡信号的能量,信号能量分布较均衡。3种节流仪表均能很好地描述两相流定态特性,能够用于两相流流型识别及其它参数测量。

In this paper,the dynamic characteristics in the measurement of gas-liquid two-phase flow with different throttle flow-meters including Venturi tube,multi-hole orifices plate and V-shaped inner conical were studied.Firstly,high-frequency pressure sensor is adopted to get the dynamic differential pressure signal under different flow patterns.Secondly,the AOK spectrum is introduced and used in the analysis of the dynamic differential pressure signal.Then,the time-varying characteristic of dynamic differential pressure signal in different flow patterns is studied by estimating the time-frequency spectrum.It is indicated by experiments with the typical bubbly flow,slug flow and plug flow signals that Venturi tube has strong noise component at plug flow,and V-shaped inner cone has strong noise component at bubbly flow,multi-hole orifices plate is good at restraining noise.Furthermore,the multi-hole orifices plate can perform fine rectifying function and balance the energy of signals,which makes the energy distribution of signals more proportionate.The three kinds of throttling flow-meter can well describe the dynamic characteristics of gas-liquid two-phase flow,which can be used in the two-phase flow pattern identification and characteristic variables′ measurement.