Progress and Future Challenges in Bionic Drag Reduction Research Inspired by Fish Skin Properties

Area of Science:

• Biomimetics and Fluid Dynamics
• Marine Biology and Engineering

Background:

• Fish have evolved complex skin structures for aquatic adaptation and efficient locomotion.
• These structures play a crucial role in reducing fluid drag and enhancing swimming performance.

Purpose of the Study:

• To explore the connection between fish skin complexity and drag reduction.
• To offer novel design concepts for drag reduction surfaces on underwater vehicles.

Main Methods:

• Categorization of biomimetic drag reduction technologies into riblet, flexible, and composite types.
• Analysis of drag reduction mechanisms in shark skin (riblet) and dolphin skin (flexible).
• Investigation of synergistic effects in composite drag reduction from other fish species.

Main Results:

• Riblet structures, like shark skin, influence flow characteristics for drag reduction.
• Flexible skin, exemplified by dolphins, contributes to drag reduction and high-speed movement.
• Composite structures demonstrate synergistic effects for enhanced drag reduction.

Conclusions:

• Fish skin structures provide diverse strategies for fluid drag reduction.
• Biomimetic applications of these structures offer potential for improved underwater vehicle design.
• Further research is needed to overcome challenges in bionic drag reduction technologies.