电磁波相位传感器弹状流混合介电常数分析

根据电磁波传播理论,设计了测量截面含气率的相位传感器。 通过在传感器前端加装混相器,使之转化为均相流动,实 现弹状流截面含气率的测量,并对不同流动条件下混合介电常数进行了分析。 对对数、雷列伊、串并联、H-B 和 Bruggenman 混 合介电常数预测模型进行对比评价,平均绝对百分比误差分别为 41. 51% 、6. 07% 、80. 45% 、62. 51% 和 56. 7% 。 针对弹状流,提 出一种新的加权混合介电常数预测模型,平均绝对百分比误差为 4. 37% ,71. 43% 的数据在 5% 的平均相对误差范围内。 根据同 一流动条件下基于均相流的截面含气率实验模型作为弹状流模型实验中的参比真值,对提出的混合介电常数预测模型求解的 截面含气率的结果进行验证及评价,结果表明,截面含气率预测模型的平均绝对百分比误差为 0. 34% 。

Analysis of hybrid dielectric constant of electromagnetic wave phase sensor slug flow

Based on the electromagnetic wave propagation theory, this article designs a phase sensor to measure void fraction. By adding a phase mixer to the front of the sensor to convert it into homogeneous flow, the measurement of the void fraction of the slug flow is achieved, and the mixing dielectric constant under different flow conditions is analyzed. The hybrid dielectric constant prediction models, logarithmic, Rayleigh, series-parallel connection, H-B and Bruggenman, are evaluated comparatively with mean absolute percentage error of 41. 51% , 6. 07% , 80. 45% , 62. 51% , and 56. 7% , respectively. A new weighted mixed dielectric constant prediction model is proposed for the slug flow, and the mean absolute percentage error is 4. 37% , with 71. 43% of the data within 5% of the mean relative error. Based on the experimental model of void fraction based on homogeneous flow under the same flow conditions as the reference true value in the experiments of the slug flow model, the results of the void fraction solved by the hybrid dielectric constant prediction model proposed in this article are verified and evaluated. Results show that the mean absolute percentage error of the void fraction prediction model is 0. 34% .