Results 31 to 40 of about 105,358 (290)

New Progress in Research on Dynamic Stall of Helicopter Rotors

Nanjing Hangkong Hangtian Daxue Xuebao
For over half a century， rotor dynamic stall has remained a key research focus and challenge in helicopter aerodynamics. Through persistent and in-depth exploration， researchers have achieved significant progress in measurement and prediction of rotor ...
JING Simeng, ZHAO Qijun, YANG Liuqing, GAO Yuan, ZHAO Guoqing   +4 more
doaj   +1 more source

Compressible dynamic stall control using dynamic shape adaptation

AIAA Journal, 2001
(AIAA Paper 99-0655), AIAA Journal, Vol. 39, No. 10, pp. 2021-2024, Oct. 2001. The approaches of compressible dynamic stall control using real-time airfoil adaptation and slatted airfoils are compared. Each method attempts to solve the unsteady flow separation and the underlying causes differently.
Chandrasekhara, M. S., Wilder, M. C., Carr, L. W.   +2 more
openaire   +2 more sources

Study on the Flow Control of the Airfoil Dynamic Stall Using the Co-flow Jet

Hangkong gongcheng jinzhan, 2018
Dynamic stall control is of great significance for enhancement of the airfoil aerodynamic characteristics. In the present study, the co-flow jet(CFJ) flow control method is numerically investigated to control the dynamic stall caused by the pitching ...
Yang Huiqiang, Xu Heyong, Ye Zhengyin
doaj   +1 more source

Competing Mechanisms of Compressible Dynamic Stall

AIAA Journal, 1998
Earlier experiments have documented the onset of compressible dynamic stall either from the bursting of a leading-edge laminar separation bubble or from a leading-edge shock, depending on the Reynolds number and Mach number. For certain combinations of conditions, the supersonic flow and the bubble dynamics compete with each other.
Chandrasekhara, M.S., Wilder, M.C., Carr, L.W.   +2 more
openaire   +2 more sources

Large eddy simulation of dynamic stall over an airfoil and its control with plasma actuator

AIP Advances, 2023
The purpose of this study is to investigate deep dynamic stall over a pitching National Advisory Committee for Aeronautics 0015 airfoil and its control with an alternating current dielectric barrier discharge (AC-DBD) plasma actuator by means of large ...
Hengyang Zhang, Haocheng Yu, Ao Zhang, Jianguo Zheng   +3 more
doaj   +1 more source

Numerical Investigation of a Dynamic Stall on a Single Rotating Blade

Aerospace, 2021
Dynamic stall is a phenomenon on the retreating blade of a helicopter which can lead to excessive control loads. In order to understand dynamic stall and fill the gap between the investigations on pitching wings and full helicopter rotor blades, a ...
Yin Ruan, Manfred Hajek
doaj   +1 more source

Control of rotorcraft retreating blade stall using air-jet vortex generators [PDF]

, 2006
A series of low-speed wind tunnel tests were carried out on an oscillating airfoil fitted with two rows of air-jet vortex generators (AJVGs). The airfoil used had an RAE 9645 section and the two spanwise arrays of AJVGs were located at x/c=0.12 and 0.62.
Akanni S. D., Alferai M., Anastasios Kokkalis, Bousman W. G., Carr L. W., Chan W., Chrisminder Singh, Coton F. N., David J. Peake, Frank N. Coton, Green R. B., Johnson W., Lewington N. P., McCloud J. L., III, McCroskey W. J., Robinson M. C., Roderick A. McD. Galbraith, Singh C., Teves D., Vahik Khodagolian, Weaver D., Wilby P. G., Wilby P. G.   +22 more
core   +1 more source

The newfound relationship between extrachromosomal DNAs and excised signal circles

FEBS Letters, EarlyView.
Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley   +1 more source

Shape‐Morphing Nanoengineered Hydrogel Ribbons as Hemostats

Advanced Functional Materials, EarlyView.
This study introduces a self‐assembling, shape‐morphing nanoengineered hydrogel ribbon system that rapidly forms porous aggregates in situ for efficient hemostasis in trauma and surgical applications. Abstract Rapid and effective hemorrhage control remains a major challenge in trauma and surgical care, particularly for complex or noncompressible wounds.
Ryan Davis Jr, Saptarshi Biswas, Jacob Aragon, Asaf Dana, Jasmine Sureka, Vaaridhi Ramanuja, Jeevika Thazhaiselvam, Sarah E. Miller, Taylor H. Ware, Akhilesh K. Gaharwar   +9 more
wiley   +1 more source

Near Stall Unsteady Flow Responses to Morphing Flap Deflections

Fluids, 2021
The unsteady flow characteristics and responses of an NACA 0012 airfoil fitted with a bio-inspired morphing trailing edge flap (TEF) at near-stall angles of attack (AoA) undergoing downward deflections are investigated at a Reynolds number of 0.62 × 106 ...
Chawki Abdessemed, Yufeng Yao, Abdessalem Bouferrouk   +2 more
doaj   +1 more source