基于光纤光谱的气泡特征参数检测方法研究

Detection Method of Bubble Characteristic Parameters Based on Optical Fiber Spectroscopy

为了定量检测气液两相流中气泡尺寸(气泡截面直径)、气泡频率、气泡上升速率,提出一种光纤光谱气泡特征参数定量检测方法。首先,采用近红外光纤光谱仪、平凸透镜、多模石英光纤、高速摄像机、气液两相流管道、注射泵等构建了气泡特征参数光学检测系统。然后,建立了光纤光谱定量检测气液两相流中气泡尺寸、频率、速率的理论模型,采用Zemax软件仿真分析了光学测量系统的光路传输路径。最后,实验研究了光学测量系统对气泡特征参数定量检测的性能。研究表明,所提出的气液两相流中气泡特征参数检测方法可同时定量检测气泡尺寸、频率和速率,对气泡尺寸、频率、速率检测的最大相对误差分别为9.8%、8.1%和8.7%。

To quantitatively detect the bubble size(cross-sectional diameters of bubbles),bubble frequency,and bubble rising velocity in gas-liquid two-phase flow,this study proposes a method for quantitative detection of the bubble characteristic parameters based on optical fiber spectroscopy.First,an optical system for the detection of bubble characteristic parameters is constructed with the near-infrared optical fiber spectrometer,plano-convex lens,multi-mode silica optical fiber,high-speed camera,gas-liquid two-phase flow pipeline,and syringe pump.Second,the theoretical models for quantitative detection of bubble size,frequency,and velocity in gas-liquid two-phase flow are built.Third,Zemax is used to simulate and analyze the optical transmission path in the optical measurement system.Finally,the performance of the optical measurement system in quantitative detection of bubble characteristic parameters is experimentally studied.The results indicate that the bubble size,frequency,and velocity in gas-liquid two-phase flow can be detected quantitatively by the proposed method,and the maximum relative detection errors of them are 9.8%,8.1%,and 8.7%,respectively.