Numerical Investigation of Entrainment Mechanism of Jet Boat Tail Passive Flow Control for Base Drag Reduction

2016 ◽  
Author(s):  
Yunchao Yang ◽  
Gecheng Zha
Keyword(s):  
Drag Reduction ◽  
Flow Control ◽  
Numerical Investigation ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Base Drag

Large eddy simulation of base drag reduction using jet boat tail passive flow control

2020 ◽  
Vol 198 ◽  
pp. 104398 ◽  
Author(s):  
Yunchao Yang ◽  
William Bradford Bartow ◽  
Gecheng Zha ◽  
Heyong Xu ◽  
Jianlei Wang
Keyword(s):  
Large Eddy Simulation ◽  
Drag Reduction ◽  
Flow Control ◽  
Passive Flow Control ◽  
Eddy Simulation ◽  
Passive Flow ◽  
Large Eddy ◽  
Base Drag

scholarly journals Large Eddy Simulation of Base Drag Reduction with Jet Boat-tail Passive Flow Control

2015 ◽  
Vol 126 ◽  
pp. 150-157 ◽  
Author(s):  
Yunchao Yang ◽  
Heyong Xu ◽  
Jianlei Wang ◽  
Gecheng Zha
Keyword(s):  
Large Eddy Simulation ◽  
Drag Reduction ◽  
Flow Control ◽  
Passive Flow Control ◽  
Eddy Simulation ◽  
Passive Flow ◽  
Large Eddy ◽  
Base Drag

scholarly journals Microfiber Coating for Flow Control over a Blunt Surface

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 664 ◽  
Author(s):  
Mitsugu Hasegawa ◽  
Hirotaka Sakaue
Keyword(s):  
Drag Reduction ◽  
Flow Control ◽  
Bluff Body ◽  
Relative Length ◽  
Control Device ◽  
Cylinder Surface ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Maximum Drag Reduction ◽  
The Impact

A microfiber coating having a hair-like structure is investigated as a passive flow control device of a bluff body. The effect of microfiber length is experimentally studied to understand the impact of the coating on drag on a cylinder. A series of microfiber coatings with different lengths are fabricated using flocking technology and applied to various locations over the cylinder surface under the constant Reynolds number of 6.1 × 104 based on the diameter of the cylinder. It is found that the length and the location both play important roles in the drag reduction. Two types of drag reduction can be seen: (1) when the relative length of the microfiber, k/D, is less than 1.8%, and the coating is applied before flow separates over the cylinder; and (2) k/D is over 3.3%, and the coating is applied after the flow separation location on the cylinder. The maximum drag reduction for the former type is 59% compared to that from the cylinder without the microfiber coating. For the latter type, the maximum drag reduction is 27%.

Bluff Body Drag Reduction Using Passive Flow Control of Jet Boat Tail

2015 ◽  
Vol 8 (2) ◽  
pp. 713-721 ◽  
Author(s):  
Trevor Hirst ◽  
Chuanpeng Li ◽  
Yunchao Yang ◽  
Eric Brands ◽  
Gecheng Zha
Keyword(s):  
Drag Reduction ◽  
Flow Control ◽  
Bluff Body ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Body Drag
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