Study on Drag Reduction Performance of Bionic Non Smooth Surface
In the process of long-distance pipeline transportation of natural gas,it is very important to reduce the frictional resistance generated during transportation.In order to reduce the resistance along the pipeline transportation and increase the transportation efficiency of the pipeline,it is particularly important to learn the natural screening obtained from the evolution of insects and other organisms in the natural environment and apply bionics to drag reduction.In this paper,the characteristics of friction resistance of non smooth wall pipes was studied,a bionic crater theoretical model was established with RNG k-ε.The flow was analyzed by the model.At the same time,combining the bionics foundation and fluid mechanics knowledge,Catia was used for three-dimensional modeling,and Ansys and other software were used for numerical simulation.By studying and comparing the flow of fluid in the pipe under the conditions of concave,convex and different depths,the drag reduction efficiency of different models was further obtained by comparing the turbulence intensity and pressure in the pipe.It was found that the drag reduction efficiency of the pit structure was higher than that of the convex and plane structures,and the stacking structure vortex in the pit structure wasan important reason for the drag reduction of the pit structure.
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