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气水两相流质量流量和干度的测量是反应堆失水事故研究中的重要研究课题。作者曾从两相分离流模型出发,推导出了利用节流装置在两相流中差压方根的统计平均值和统计方差估计其质量流量及干度的理论模型。本文用孔板在压力5.8～12.1MPa、干度0.05～0.95的气水两相流实验数据证实了理论模型的正确性,并拟合出半理论、半经验的实用模型。采用这一模型,由孔板差压方根的统计样本估计两相流质量流量和干度的均方偏差分别为±9.0％和±6.5％。这一研究实现了用单一孔板进行两相流双参数测量。
The measurement of mass flow and dryness of gas-water two-phase flow is an important research topic in the research of reactor water loss accident. Based on the two-phase separation flow model, the author deduces the theoretical model of estimating the mass flow rate and dryness of the differential pressure root mean square and the statistical variance of two-phase flow in a throttling device. In this paper, the experimental data of gas-water two-phase flow with pressure of 5.8 ~ 12.1MPa and dryness of 0.05 ~ 0.95 were used to confirm the correctness of the theoretical model and fit the semi-theoretical and semi-empirical practical model. Using this model, the mean square deviation of the mass flow and dryness of the two-phase flow was estimated to be ± 9.0% and ± 6.5%, respectively, from the statistical sample of square root of differential pressure at the orifice. This study enables two-phase two-phase flow measurement with a single orifice plate.