Analysis of Dynamic Characteristics of Gas-liquid Flow During Water-filling Process in Pipeline
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Abstract:
The water-filling process in pipeline involves gas-liquid two-phase transient flow. A reasonable analysis and assessment of the two-phase dynamic characteristics is very important for the optimization design and safe operation of engineering project and numerical simulation study. Based on the dimensional analysis and similarity theory, the similarity laws of the gas-phase model during the water-filling process were established, and the dynamic similarity laws of the exhaust process in vents were similar to the gravity similarity laws; therefore the geometric proportion relationship of detained air bubbles in the pipeline in the prototype and model was obtained. The similarity laws of the gas-phase model were applied to the hydraulic model test of the culvert air vent on the West 4th Ring Road of Beijing in the South-to-North Water Diversion Project, which provided the dynamic parameters of gas-liquid two-phase flow during the water-filling process and the reasonable water-filling flow rate in the culvert. Furthermore, the effects of the detained air bubbles on the conveyance capacity were analyzed quantitatively and qualitatively.
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