Experimental Study on Closed-loop Flow Separation Control Utilizing Deep Q-Network over Fixed Angle-of-Attack Airfoil

2018 ◽  
Vol 2018 (0) ◽  
pp. S0520306
Author(s):  
Satoshi SHIMOMURA ◽  
Satoshi SEKIMOTO ◽  
Hiroaki HUKUMOTO ◽  
Akira OYAMA ◽  
Kozo FUJII ◽  
...  
Keyword(s):  
Experimental Study ◽  
Flow Separation ◽  
Closed Loop ◽  
Angle Of Attack ◽  
Separation Control ◽  
Flow Separation Control ◽  
Fixed Angle

Closed-Loop Flow Separation Control Using the Deep Q Network over Airfoil

AIAA Journal ◽  
2020 ◽  
Vol 58 (10) ◽  
pp. 4260-4270
Author(s):  
Satoshi Shimomura ◽  
Satoshi Sekimoto ◽  
Akira Oyama ◽  
Kozo Fujii ◽  
Hiroyuki Nishida
Keyword(s):  
Flow Separation ◽  
Closed Loop ◽  
Separation Control ◽  
Flow Separation Control

Flow separation control of NACA-2412 airfoil with bio-inspired nose

2019 ◽  
Vol 91 (7) ◽  
pp. 1058-1066 ◽  
Author(s):  
Mohamed Arif Raj Mohamed ◽  
Ugur Guven ◽  
Rajesh Yadav
Keyword(s):  
Flow Control ◽  
Flow Separation ◽  
Control Method ◽  
Angle Of Attack ◽  
Leading Edge ◽  
Separation Control ◽  
Cetacean Species ◽  
Aerodynamic Efficiency ◽  
Content Type ◽  
Flow Separation Control

Purpose The purpose of this paper is to achieve an optimum flow separation control over the airfoil using passive flow control method by introducing bio-inspired nose near the leading edge of the NACA 2412 airfoil. Design/methodology/approach Two distinguished methods have been implemented on the leading edge of the airfoil: forward facing step, which induces multiple accelerations at low angle of attack, and cavity/backward facing step, which creates recirculating region (axial vortices) at high angle of attack. Findings The porpoise airfoil (optimum bio-inspired nose airfoil) delays the flow separation and improves the aerodynamic efficiency by increasing the lift and decreasing the parasitic drag. The maximum increase in aerodynamic efficiency is 22.4 per cent, with an average increase of 8.6 per cent at all angles of attack. Research limitations/implications The computational analysis has been done for NACA 2412 airfoil at low subsonic speed. Practical implications This design improves the aerodynamic performance and increases structural strength of the aircraft wing compared to other conventional high-lift devices and flow-control devices. Originality/value Different bio-inspired nose designs which are inspired by the cetacean species have been analysed for NACA 2412 airfoil, and optimum nose design (porpoise airfoil) has been found.

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