Experimental study on gulling processes with underwater multi-nozzle moving jets
In order to explore the influence of various process parameters of the hydraulic jet trenching machine on the trenching effect,a modular multi-nozzle jet device was designed.The jet experiment has been conducted to study the effects of the number and arrangement of nozzles,nozzle diameter,and translation speed on the gulling processes.The optimal jet combination has also been obtained through analyzing the variation of depth and width of gullies,and the dune heights on both sides.The results show that the nozzle arrangement has an important influence on the gully shape.When the flow rate remains the constant and with the decreasing of the number of nozzles,the depth and width of the gully have a trend of first increasing and then decreasing,and the cross section of the gully gradually changed from the"U"shape to the"V"shape.The characteristic dimension of the gully decreases with the increasing of the nozzle diameter,which can be explained directly by the variation of Froude number at the nozzle outlet directly when the flow rate keeps a constant.The influence of translation speed of the jet on gully depth is significantly greater than that on gully width,but both show a decreasing trend as the moving speed increases.The research results have guiding significance for the optimal design and construction operation of trenching machines.
burial of submarine pipelinesmulti-nozzle jetsmoving jetscharacteristic dimension of gully
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