Results 61 to 70 of about 150,010 (213)

Theoretical and experimental study of a new method for prediction of profile drag of airfoil sections [PDF]

Theoretical and experimental studies are described which were conducted for the purpose of developing a new generalized method for the prediction of profile drag of single component airfoil sections with sharp trailing edges. This method aims at solution
Goradia, S. H., Lilley, D. E.
core   +1 more source

Sound suppression mixer [PDF]

, 1994
A gas turbine engine flow mixer includes at least one chute having first and second spaced apart sidewalls joined together at a leading edge, with the sidewalls having first and second trailing edges defining therebetween a chute outlet.
Brown, William H.
core   +1 more source

Improvement of airfoil trailing edge bluntness noise model

Advances in Mechanical Engineering, 2016
In this article, airfoil trailing edge bluntness noise is investigated using both computational aero-acoustic and semi-empirical approach. For engineering purposes, one of the most commonly used prediction tools for trailing edge noise are based on semi ...
Wei Jun Zhu, Wen Zhong Shen, Jens Nørkær Sørensen, Giorgos Leloudas   +3 more
doaj   +1 more source

Flutter suppression and gust alleviation using active controls [PDF]

Application of the aerodynamic energy approach to some problems of flutter suppression and gust alleviation were considered. A simple modification of the control-law is suggested for achieving the required pitch control in the use of a leading edge ...
Nissim, E.
core   +2 more sources

Study on Aerodynamic Performance of Wind Turbine Airfoil With Combined S-Slot and Trailing Edge Flap Control

发电技术
Reducing the blade aerodynamic loads is extremely important to extend the life of wind turbine blades. Trailing edge flaps are effective means to reduce blade aerodynamic loads, however, its regulation ability weakens greatly at large angles of wind ...
QIN Zhipeng, WEI Gaosheng, CUI Liu, DU Xiaoze   +3 more
doaj   +1 more source

Spanning trails containing given edges

Discrete Mathematics, 2006
Let \(r\geq 0\) be an integer. A graph \(G\) is called \(r\)-Eulerian-connected if for any \(X\subseteq E(G)\) with \(| X| \leq r\) and for any two vertices \(u,v\in V(G)\) (including the case \(u=v\)), the graph \(G\) has a spanning \((u,v)\)-trail containing all edges of \(X\), and \(G\) is called \(r\)-edge-Eulerian-connected if for any \(X\subseteq
Luo, Weiqi, Chen, Zhi-Hong, Chen, Wei-Guo   +2 more
openaire   +3 more sources

Aeroacoustic and flow assessments of the poro-serrated trailing edges [PDF]

, 2016
This paper reports an aeroacoustic study of a NACA0012 aerofoil with a nonflat plate type serrated trailing edge, and a number of Poro-Serrated trailing edge devices that contain porous materials of various air flow resistances at the gaps between ...
Chong T. P., Dassen T., Hurault J., Oerlemans S.   +3 more
core   +1 more source

Preliminary assessment of the NACA0021 trailing edge wedge for wind turbine application. [PDF]

Heliyon, 2023
Abdalkarem AAM, Ansaf R, Muzammil WK, Ibrahim A, Harun Z, Fazlizan A.   +5 more
europepmc   +1 more source

Externally blown flap trailing edge noise reduction by slot blowing: A preliminary study [PDF]

Short takeoff and landing (STOL) aircraft using externally blown flaps (EBF) for lift augmentation develop considerable jet-flap interaction noise. A proposed method to reduce the EBF trailing edge noise is to locate a slot near the trailing edge of a ...
Burns, R. J., Mckinzie, D. J., Jr.
core   +1 more source

Control of acoustic tone formation using shape geometry modifications and jet blowing in a cavity experiencing supersonic flow

International Journal of Thermofluids
Acoustics tones have caused significant damage to sensitive electronic equipment and aircraft respectively. The effects become severe in cavities experiencing turbulent flows and could lead to human fatalities.
Olanrewaju M. Oyewola, Morakinyo J. Labiran   +1 more
doaj   +1 more source