Based on the RSM model,the drag reduction characteristics of fishscale structures in ducts are investigated by numerical simulation.The drag reduction rates of up-convex fishscale arrangement,up-convex single fishscale arrangement and down-convex single fishscale arrangement in ducts are compared.The results show that the up-convex fishscale arrangement smoothes the ducts compared to the up-convex single fishscale arrangement,which increases the resistance in the ducts.And the down-concave individual fishscale arrangement can be effective in reducing the resistance in the duct.When modifying the depth h(h=1mm,3mm,5mm)of the concave single fishscale row,the row spacing L is unchanged,h=5mm,the best resistance reduction effect,the maximum resistance reduction rate of 2.5%.When the spacing L(L=2cm,2.5cm,3cm)of the concave single fish scale structure is modified and the depth h is unchanged,when L=3cm,it has the best resistance reduction capability for the duct,and the maximum resistance reduction rate is 2.8%.
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