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在电磁流量计的实际测量过程中由于测量环境复杂性和测量过程的不确定性,致使测量介质并不是单相液体。而检定规程要求在电磁流量计的测量过程中测量介质为单相液体。文章基于专业的流体动力学计算软件建立两相流模型,通过分析计算,得出了不同的入口速度和不同的两相混合比列下进出口压力损失和中心点的速度,计算分析了不同参数对其流场特性和流型的影响。结果表明不同的入口速度和两相的混合比例对流场中心点的速度及进出口压力损失是有影响的,分析结果对提高电磁流量计的测量精度提供了一定的理论依据和借鉴经验。
In the actual measurement process of the electromagnetic flowmeter due to the complexity of the measurement environment and the uncertainty of the measurement process, the measurement medium is not a single-phase liquid. Verification procedures require that the medium be measured as a single-phase liquid during the measurement of the electromagnetic flowmeter. Based on professional fluid dynamics calculation software, a two-phase flow model was established. Through analysis and calculation, different inlet velocities and pressure drop at inlet and outlet and velocity at central point under different two-phase mixing ratio were obtained. Influence on Flow Field Characteristics and Flow Pattern. The results show that the different inlet velocities and the mixing ratio of two phases have influence on the velocity of the center of the flow field and the pressure loss at the inlet and the outlet. The analysis results provide some theoretical basis and experience for improving the measurement accuracy of the electromagnetic flowmeter.