Study On Structure Characteristic And Drag Reduction Efficiency Of The Non-smooth Surface

With the increasing energy crisis and the spread idea of green, energy-efficient, environment protection, people have great interest in reducing energy consumption effictively and conveniently. Fluid drag reduction technology is one of the hot topics in today’s society, and non-smooth surfaces get wide attention as one of the most promising drag reduction technology. It has been widely applied to important aerospace and pipeline transportation for its long development time, mature technology and good economic returns. This paper summarizes the research status and progess of many domestic and abroad scholars in the field of drag reduction technology, while making detail dicuss about the application of non-smooth surface drag reduction. In addition, the paper references some popular theory of the turbulent boundary layer structure and the burst of turbulence, and it has a deep discussion about the possible factors which is caused by bionic non-smooth surface.Four different biomimetic surface structure based on natural biological skin drag is designed in the paper. It is proved that the drag reduction ability of the non-smooth surfaces with different structures in different fluid conditions by simulating the near-wall boundary and initial experiment with Fluent software. Then, the paper analyzes the characteristic parameters (velocity, turbulence intensity and turbulent kinetic energy, etc.) near the wall field under the conditions of adequate develoment of the turbulence fluid. On this basis, the paper reveals resistance mechanism of the bionic non-smooth surface.In addition, the paper also talks about the drag reduction performance of high velocity and large-size bionic non-smooth surface. All of these will provide the relevant data for the follow-up work.