An experimental study on the effect of a novel nature-inspired 3D-serrated leading edge on the aerodynamic performance of a double delta wing in the transitional flow regime

2019 ◽  
Vol 33 (12) ◽  
pp. 5913-5921
Author(s):  
Hamed Khodabakhshian Naeini ◽  
Mahdi Nili-Ahmadabadi ◽  
Kyung Chun Kim
Keyword(s):  
Experimental Study ◽  
Flow Regime ◽  
Delta Wing ◽  
Leading Edge ◽  
Aerodynamic Performance ◽  
Transitional Flow ◽  
Double Delta Wing

Effect of leading edge shapes on 81°/45° double-delta wing at low speeds

2017 ◽  
Vol 232 (16) ◽  
pp. 3100-3107 ◽  
Author(s):  
B Ashwin Kumar ◽  
P Kumar ◽  
S Das ◽  
JK Prasad
Keyword(s):  
Reasonable Agreement ◽  
Strong Influence ◽  
Delta Wing ◽  
Leading Edge ◽  
Aerodynamic Performance ◽  
Surface Flow ◽  
The Body ◽  
Freestream Velocity ◽  
Flow Visualizations ◽  
Double Delta Wing

Investigations were performed on an 81°/45° sweep double-delta wing at a freestream velocity of 20 m/s. Experiments consisted of the measurement of forces, static pressures, and surface flow visualizations. Effect of the leading edge shapes of the double-delta wing was studied. Results indicated a strong influence of the leading edge shape on the aerodynamic performance of the body. The increase in the bluntness of the leading edge augments the suction pressure and delays the vortex lift phenomena at higher angles of attack, which in turn enhances the lift over the wing. A reasonable agreement between the experiments and computations were observed.

scholarly journals Experimental study of flow field distribution over a generic cranked double delta wing

2016 ◽  
Vol 29 (5) ◽  
pp. 1196-1204 ◽  
Author(s):  
Mojtaba Dehghan Manshadi ◽  
Mehdi Eilbeigi ◽  
Mohammad Kazem Sobhani ◽  
Mehrdad Bazaz Zadeh ◽  
Mohammad Ali Vaziry
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Field Distribution ◽  
Delta Wing ◽  
Double Delta Wing

scholarly journals Experimental Study of Airfoil Leading Edge Combs for Turbulence Interaction Noise Reduction

Acoustics ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. 207-223 ◽  
Author(s):  
Thomas Geyer ◽  
Sahan Wasala ◽  
Ennes Sarradj
Keyword(s):  
Experimental Study ◽  
Noise Reduction ◽  
Microphone Array ◽  
Pressure Fluctuations ◽  
Leading Edge ◽  
Aerodynamic Performance ◽  
Airfoil Surface ◽  
Low Frequencies ◽  
High Frequencies ◽  
Turbulent Eddies

The interaction of a turbulent flow with the leading edge of a blade is a main noise source mechanism for fans and wind turbines. Motivated by the silent flight of owls, the present paper describes an experimental study performed to explore the noise-reducing effect of comb-like extensions, which are fixed to the leading edge of a low-speed airfoil. The measurements took place in an aeroacoustic wind tunnel using the microphone array technique, while the aerodynamic performance of the modified airfoils was captured simultaneously. It was found that the comb structures lead to a noise reduction at low frequencies, while the noise at high frequencies slightly increases. The most likely reasons for this frequency shift are that the teeth of the combs break up large incoming turbulent eddies into smaller ones or that they shift turbulent eddies away from the airfoil surface, thereby reducing pressure fluctuations acting on the airfoil. The aerodynamic performance does not change significantly.

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