Study on effectiveness of long-distance compressed air foam delivery by firefighting robots at ultra-high voltage converter stations
In order to clarify the reliability of transporting the compressed air foam from the generator to the lifting firefighting robot,the Fluent simulation software was used to carry out numerical simulation research on the pressure drop of compressed air foam in the pipeline.The results show that within the range of gas-liquid ratio from 6∶1 to 10∶1,the pressure drop of compressed air foam in the long-distance transportation process increases with the increase of gas-liquid ratio,and the pressure drop of foam in 10∶1 at the end of hard pipe is 1.7 times as much as that of the foam in 6∶1.Under the same air-liquid ra-tio,mixing ratio,and supply flow rate,the pressure drop in the hard pipe section is positively correlated with the transportation distance,and reaches the maximum value of 166 kPa at the transportation to 315 m.There exists a large pressure drop before and after the connection port,and the value of which is greater than that at the transportation of 150 m in the hard pipe sec-tion and is 1.18 times of it.The pressure drop in the hose section is particularly significant during the climbing stage of trans-portation process.The gas-liquid ratio,transport distance,pipe diameter and height change are the main factors affecting the pressure drop change during the transportation of compressed air foam,and the influence of pipe diameter and height is partic-ularly significant.The research results can provide certain theoretical reference for the application of lifting firefighting robots in extra-high voltage converter stations.
foammultiphase flownon-Newtonian fluidnumerical simulationconnection port
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