Design and manufacture of conformal microtexture on complex curved wall and research on turbulent drag reduction mechanism
Key projects of provincial natural science foundation
Under the background that scientific and technological innovation is increasingly leading the evolution of international competition pattern, turbulent drag reduction of underwater vehicles moving at high Reynolds number has become one of the key technical bottlenecks that need to be broken through in the application of national major projects in the fields of ocean engineering, national defense and military industry. With the vigorous development of the evolution dynamics of the near-wall turbulent structure, the surface graphical microstructure has shown an attractive prospect of accurately controlling the near-wall turbulent resistance according to the designed path. Based on the self-developed parallel projection galvanometer scanning (PPGS) laser etching technology, this project develops conformal design and optimized layout methods of different types of graphical microstructures on the surface of typical complex curved surface structural parts of underwater vehicles. Through systematic experiments, it measures the regulation and control law of graphical microstructures on near-wall turbulent resistance and the temporal and spatial evolution characteristics of curved surface turbulent structure under the regulation and control of surface microstructures. The near-wall turbulent drag reduction mechanism of complex curved wall based on graphical microstructure regulation is revealed, which breaks through the technical bottleneck of the current graphical microstructure drag reduction technology from plane to curved wall and from laboratory to engineering application, and provides a new common technical path for major engineering applications in related high-end manufacturing fields in China.
