TY - JOUR
T1 - Low Air Drag Surface via Multilayer Hierarchical Riblets
AU - Zhou, Zidan
AU - Wang, Shengkun
AU - Yan, Zexiang
AU - Wang, Daoyuan
AU - Deng, Jinjun
AU - He, Yang
AU - Yuan, Weizheng
N1 - Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/11/10
Y1 - 2021/11/10
N2 - 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 ∼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.
AB - 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 ∼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.
KW - air drag reduction
KW - closed air channel
KW - low air drag surface
KW - multilayer hierarchical riblets (MLHRs)
KW - vortex behavior
UR - http://www.scopus.com/inward/record.url?scp=85119016767&partnerID=8YFLogxK
U2 - 10.1021/acsami.1c13456
DO - 10.1021/acsami.1c13456
M3 - 文章
C2 - 34709794
AN - SCOPUS:85119016767
SN - 1944-8244
VL - 13
SP - 53155
EP - 53161
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 44
ER -