Boundary-layer separation from the electrode wall of an MHD generator

AIAA Journal ◽  
1976 ◽  
Vol 14 (11) ◽  
pp. 1585-1588 ◽  
Author(s):  
C. C. P. Pian ◽  
W. F. H. Merck
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Separation ◽  
Layer Separation ◽  
Mhd Generator ◽  
Electrode Wall

Influence of Anode-Region Boundary-Layer Separation on Disk MHD-Generator Performance

2007 ◽  
Vol 35 (5) ◽  
pp. 1588-1597 ◽  
Author(s):  
Alessandro Liberati ◽  
Yoshihiro Okuno
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Separation ◽  
Anode Region ◽  
Layer Separation ◽  
Mhd Generator ◽  
Generator Performance

The boundary layer separation from streamlined surfaces and new ways of its prevention in diffusers

2017 ◽  
Author(s):  
Arkady Zaryankin ◽  
Andrey Rogalev ◽  
Ivan Komarov ◽  
V. Kindra ◽  
S. Osipov
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Separation ◽  
Layer Separation

scholarly journals Leading Edge Blowing to Mimic and Enhance the Serration Effects for Aerofoil

2021 ◽  
Vol 11 (6) ◽  
pp. 2593
Author(s):  
Yasir Al-Okbi ◽  
Tze Pei Chong ◽  
Oksana Stalnov
Keyword(s):  
Boundary Layer ◽  
Angle Of Attack ◽  
Leading Edge ◽  
Boundary Layer Separation ◽  
Shear Instability ◽  
Vortical Flow ◽  
High Angle ◽  
High Angle Of Attack ◽  
Layer Separation ◽  
Aerodynamic Performances

Leading edge serration is now a well-established and effective passive control device for the reduction of turbulence–leading edge interaction noise, and for the suppression of boundary layer separation at high angle of attack. It is envisaged that leading edge blowing could produce the same mechanisms as those produced by a serrated leading edge to enhance the aeroacoustics and aerodynamic performances of aerofoil. Aeroacoustically, injection of mass airflow from the leading edge (against the incoming turbulent flow) can be an effective mechanism to decrease the turbulence intensity, and/or alter the stagnation point. According to classical theory on the aerofoil leading edge noise, there is a potential for the leading edge blowing to reduce the level of turbulence–leading edge interaction noise radiation. Aerodynamically, after the mixing between the injected air and the incoming flow, a shear instability is likely to be triggered owing to the different flow directions. The resulting vortical flow will then propagate along the main flow direction across the aerofoil surface. These vortical flows generated indirectly owing to the leading edge blowing could also be effective to mitigate boundary layer separation at high angle of attack. The objectives of this paper are to validate these hypotheses, and combine the serration and blowing together on the leading edge to harvest further improvement on the aeroacoustics and aerodynamic performances. Results presented in this paper strongly indicate that leading edge blowing, which is an active flow control method, can indeed mimic and even enhance the bio-inspired leading edge serration effectively.

On turbulent boundary-layer separation

1968 ◽  
Vol 32 (2) ◽  
pp. 293-304 ◽  
Author(s):  
V. A. Sandborn ◽  
C. Y. Liu
Keyword(s):  
Boundary Layer ◽  
Shear Stress ◽  
Turbulent Boundary Layer ◽  
Analytical Study ◽  
Boundary Layer Separation ◽  
Mean Velocity ◽  
Laminar Separation ◽  
Layer Separation ◽  
Turbulent Separation ◽  
Separation Model

An experimental and analytical study of the separation of a turbulent boundary layer is reported. The turbulent boundary-layer separation model proposed by Sandborn & Kline (1961) is demonstrated to predict the experimental results. Two distinct turbulent separation regions, an intermittent and a steady separation, with correspondingly different velocity distributions are confirmed. The true zero wall shear stress turbulent separation point is determined by electronic means. The associated mean velocity profile is shown to belong to the same family of profiles as found for laminar separation. The velocity distribution at the point of reattachment of a turbulent boundary layer behind a step is also shown to belong to the laminar separation family.Prediction of the location of steady turbulent boundary-layer separation is made using the technique employed by Stratford (1959) for intermittent separation.

Boundary layer separation for winds flowing around large fixed-roof oil-storage tanks with small aspect ratios

1973 ◽  
Vol 7 (6) ◽  
pp. 651-654 ◽  
Author(s):  
S.D. Probert ◽  
M.A. Hasoon ◽  
T.S. Lee
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Separation ◽  
Storage Tanks ◽  
Layer Separation ◽  
Oil Storage ◽  
Aspect Ratios

Dynamic mode decomposition and Koopman spectral analysis of boundary layer separation-induced transition

2021 ◽  
Vol 33 (10) ◽  
pp. 104104
Author(s):  
A. Dotto ◽  
D. Lengani ◽  
D. Simoni ◽  
A. Tacchella
Keyword(s):  
Boundary Layer ◽  
Spectral Analysis ◽  
Boundary Layer Separation ◽  
Dynamic Mode Decomposition ◽  
Dynamic Mode ◽  
Layer Separation ◽  
Mode Decomposition

Unsteady fluidic oscillators for active controlling boundary layer separation in an ultra-high-lift low-pressure turbine

2021 ◽  
pp. 107130
Author(s):  
Xiao Qu ◽  
Yingjie Zhang ◽  
Xingen Lu ◽  
Junqiang Zhu ◽  
Yanfeng Zhang
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Separation ◽  
Low Pressure ◽  
High Lift ◽  
Layer Separation ◽  
Low Pressure Turbine
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