基于同轴线相位法的两相流含气率测量研究

为了准确测量气液两相流含气率,提出一种同轴线相位差测量方法。利用同轴线传感器,通过测量电磁波经过在同轴线内分布状况不同的气液混合介质后相位差的变化,得到混合介质的含气率。完成了同轴线测量电路及测量传感器的设计,建立了一种含气率测量模型。以气液两相做了室内静态实验,并对垂直管状态下传感器响应和实验结果进行了误差分析。结果表明:相位差输出与含气率呈线性关系;同时,在不同频率下,预测结果和实验结果的相对误差在±5%范围内,说明预测模型准确度较好。

Study on Measurement of Two-phase Gas-liquid Flow Based on Coaxial Phase

In order to accurately measure the void fraction of gas-liquid two-phase flow, a coaxial phase difference measurement method was proposed. The coaxial line sensor was used to obtain the void fraction of the mixed medium by measuring the change of the phase difference after the electromagnetic wave was distributed through the gas-liquid mixed medium having different distribution conditions in the coaxial line. The design of the coaxial line measurement circuit and the measurement sensor were completed, and a void fraction measurement model was established. Subsequently, the indoor static experiment was carried out with gas-liquid two-phase. The error analysis of the sensor response and experimental results under the vertical tube state was carried out. The results show that the phase difference output is linear with the void fraction. At the same time, the relative error between the prediction result and the experimental result is within ±5% at different frequencies, indicating that the prediction model has better accuracy.