4.8 Article

Low Air Drag Surface via Multilayer Hierarchical Riblets

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 44, Pages 53155-53161

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c13456

Keywords

low air drag surface; multilayer hierarchical riblets (MLHRs); air drag reduction; closed air channel; vortex behavior

Funding

  1. National Natural Science Foundation of China (NSFC) [51735011, 51875478, 52075455]
  2. National Basic Research Project [JCKY2018]

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Riblets inspired by shark skin show great potential in reducing air drag in various industries, with blade riblets currently reaching up to 11% drag reduction. A study introduced multilayer hierarchical riblets (MLHRs) as a method to further improve drag reduction, achieving up to 16.67% reduction in a closed air channel experiment.
Riblets inspired by shark skin exhibit a great air drag reduction potential in many industries, such as the aircraft, energy, and transportation industries. Many studies have reported that blade riblets attain the highest air drag reduction ability, with a current limit of similar to 11%. Here, we propose multilayer hierarchical riblets (MLHRs) to further improve the air drag reduction ability. MLHRs were fabricated via a three-layer hybrid mask lithography method, and the air drag reduction ability was studied in a closed air channel. The experimental results indicated that the maximum air drag reduction achieved with MLHRs in the closed channel was 16.67%, which represents a 52% higher reduction than the highest previously reported. Conceptual models were proposed to explain the experiments from a microscopic perspective. MLHRs enhanced the stability of lifting and pinning vortices, while vortices gradually decelerated further, reducing the momentum exchange occurring near the wall. This verified that MLHRs overcome the current air drag reduction limit of riblets. The conceptual models lay a foundation to further improve the air drag reduction ability of riblets.

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