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Basic Research on Drag Reduction Mechanism and Replication Technology of Micro-riblets on Shark Skin

Author: SunPengXiang
Tutor: WangMinJie；ZhaoDanYang
School: Dalian University of Technology
Course: Mechanical Manufacturing and Automation
Keywords: Bionic Drag Reduction Mechanism Microreplication Micro grooves Sharkskin
CLC: TB391
Type: Master's thesis
Year: 2010
Downloads: 285
Quote: 1
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Abstract


With the spread of the energy crisis, drag reduction technology development to become an important part of the world of science and technology competition one of a variety of drag reduction method, but these methods have some limitations. Biological body for human provides rich conformation resources. Through the deepening of the level of fluid dynamics and turbulence research, it was found that the surface if a certain shape of groove drag reduction effect will be better. Shark known as \It has been through the shark fish scales Shield trench model enlarged and simplified to create a bionic shark skin. The artificial biomimetic sharkskin has important applications in Aerospace, ocean shipping, oil pipeline transportation, but forming a microscopic morphology similar bionic shark skin is still an unsolved problem with real shark skin. First of all, the Drag Reduction Mechanism of the sharkskin surface scales Shield trench structure. Numerical calculations using the finite element fluid dynamics software Fluent. Model simplifies the calculation and the entire calculation of the two parts of divided into the groove drag reduction mechanism and scales shield structure drag reduction mechanism. The results show that: the the trench inner secondary vortex convection is the main reason of the trench drag reduction. Another reason of the drag reduction effect of the surface of the sharkskin is filled in the gap between the scales shield low speed quiet fluid present at the top of the voids tiny \friction, and prevent the flake external high-speed fluid into the role of the internal space of the flakes. Then for the the sharkskin surface specific scales Shield trench structure proposed Piezothermoelectric casting and vacuum casting method two replication methods. Cast hot piezoelectric method is replication the sharkskin surface-specific scales Shield trench structure refers to the use of polymer materials by heating pressure on shark skin samples, then the ultimate to sharkskin metal mold electroforming as a prototype of electroforming method. The vacuum casting method, pointing to the surface of the sharkskin sample the casting liquid replication material, and then using the vacuum apparatus to remove the bubbles in the copying material in the chemical reaction under the action of the curing agent, the replication material solidified, and then released to obtain a method of sharkskin copies. Learned by observation and comparison of these two approaches, the sharkskin Metal the electroforming mold surface scales Shield trench structure basically copied down, clear micro grooves, scales shield structure structured. Vacuum casting method the sharkskin copy the template surface scales Shield structured scales Shield surface micro-groove profile is complete, clear, with real sharkskin similarity. But sharkskin metal the electroforming mold surface fillet phenomenon is more serious, and this phenomenon is related to the complex shape of the electroformed prototype. From a results point of view, the vacuum casting method is a relatively ideal the sharkskin Copy method.

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