Numerical study on double-nozzle impinging jet of trencher
Double-nozzle impingingjet is involved in the use of underwater jet trenching machines or dredging equipment.Therefore,theoretical support for engineering problems could be provided if the evolution law of the jet flow field is revealed.In this study,a model was made and solved by the CFD method for the problem of jet impingement on solid walls in the condition of the two-dimensional double nozzle in submergence.This paper analyzed the effect of different impinging distances,nozzle spacing,and jet velocity on the flow velocity field as well as pressure and shear stress distribution in the impact area.The verified result shows that the proposed CFD methodcan achieve good prediction results.The calculation results indicate that pressure distribution in the impact area becomes greater if the nozzle spacing is smaller.When the impinging distance gets closer,the jet pressure suddenly increases.At the same time,an oscillation effect is formed between the two nozzles,causing fluctuations in the magnitude and position of pressure and shear stress in the impact area.In practical engineering,attention should be paid to the impact of this oscillation effect on the stability of mechanical motion.
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