Studying the flow characteristics of FK-5-1-12 in the pipeline during the release process is important for appropriate hydraulic calculations and fire extinguishing efficiency evaluation. This work proposes a well-documented dataset of flow results to investigate the flow state and characteristics. Through comparing the evaporation properties of FK-5-1-12 and those of other typical extinguishers, the flow state of FK-5-1-12 was assumed to be a single-phase flow, and hydraulic calculations were carried out using single-phase fluid formulas. The calculated values were compared with experimental data. The release tests of water (pure single-phase flow), Halon1301 (two-phase flow), and FK-5-1-12 were carried out under the same piping system, and the flow characteristics of the three media were compared to further verify the piping flow state. The experimental results show that the release process of FK-5-1-12 in the cylinder has a single-phase flow similar to water, but differs in density and expansion performance. However, FK-5-1-12 only conformed to single-phase flow in the more upstream sections of the pipeline, but presented obvious two-phase flow state in the main pipe and the more downstream sections. When the vaporization is the most serious, the density of the mixture is only 1/26 of that of liquid FK-5-1-12.

中文翻译：

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灭火剂FK-5-1-12在管道释放过程中的流动特性研究

研究 FK-5-1-12 在释放过程中管道中的流动特性对于适当的水力计算和灭火效率评估具有重要意义。这项工作提出了一个有据可查的流动结果数据集，以研究流动状态和特征。通过比较 FK-5-1-12 与其他典型灭火器的蒸发特性，假设 FK-5-1-12 的流动状态为单相流，采用单相流进行水力计算。相流体公式。将计算值与实验数据进行比较。在同一管道系统下进行水（纯单相流）、Halon1301（两相流）和FK-5-1-12的释放试验，并进一步比较了三种介质的流动特性。验证管道流动状态。实验结果表明，FK-5-1-12在气缸内的释放过程具有类似于水的单相流，但密度和膨胀性能不同。而FK-5-1-12在管道较上游段仅符合单相流，而在主管段和较下游段呈现明显的两相流状态。汽化最严重时，混合物的密度仅为液体FK-5-1-12的1/26。