Study on surface fabrication and drag reduction performance of the bionic fish-scale composite structure

Abstract It has been researched that the surface structure of many organisms unique resistance reduction properties and it is important to replicate morphological features biological body on material surface. So, a method for creating biomimetic fish-scale using laser proposed by observing laminar arrangement three common fish scales surface, composite bionic scale macrostructure different microstructures were machined aluminium alloy surfaces. The morphology elemental composition characterized before test. results indicate both have an obvious effect reduced drag, among which, maximum can be achieved 44.02% at flow rate 0.6 m/s carp structure.