On the artificial wave packet development in a spanwise modulated boundary layer on the swept wing at Mach 2

2020 ◽  
Author(s):  
A. Panina ◽  
A. Kosinov ◽  
N. Semionov ◽  
Yu. Yermolaev ◽  
A. Yatskikh
Keyword(s):  
Boundary Layer ◽  
Wave Packet ◽  
Swept Wing

Excitation Of Localized Wave Packet In 3d Supersonic Boundary Layer

2017 ◽  
Vol 12 (1) ◽  
pp. 57-65
Author(s):  
Alex Yatskih ◽  
Marina Rumenskikh ◽  
Yuri Yermolaev ◽  
Aleksandr Kosinov ◽  
Nikolay Semionov ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Wave Packet ◽  
Wave Packets ◽  
Leading Edge ◽  
Supersonic Boundary Layer ◽  
Swept Wing ◽  
Sweep Angle ◽  
Asymmetric Shape ◽  
Pulse Electric ◽  
Pulse Electric Discharge

The results of experimental study of excitation of localized in time and space controlled disturbances (wave packets) in a supersonic swept-wing boundary layer are presented. The experiments were performed at Mach number M = 2 on the model of wing with a lenticular profile and a 40 degrees sweep angle of the leading edge at zero angle of attack. Wave packets were generated by a pulse electric discharge on the surface of the model. A structure of controlled wave packet was studied. It was found that the wave packet has an asymmetric shape. Comparison with the case of twodimensional boundary layer was done.

scholarly journals Algebraically decaying modes and wave packet pseudo-modes in swept Hiemenz flow

2009 ◽  
Vol 643 ◽  
pp. 309-332 ◽  
Author(s):  
DOMINIK OBRIST ◽  
PETER J. SCHMID
Keyword(s):  
Boundary Layer ◽  
Wave Packet ◽  
Free Stream ◽  
Travelling Wave ◽  
Swept Wing ◽  
Algebraic Decay ◽  
Infinite Domains ◽  
The Family ◽  
Hiemenz Flow ◽  
Attachment Line

The modal structure of the swept Hiemenz flow, a model for the flow near the attachment line of a swept wing, consists of eigenfunctions which exhibit (super-)exponential or algebraic decay as the wall-normal coordinate tends to infinity. The subset of algebraically decaying modes corresponds to parts of the spectrum which are characterized by a significant sensitivity to numerical discretization. Numerical evidence further suggests that a continuous spectrum covering a two-dimensional range of the complex plane exists. We investigate the family of uniform swept Hiemenz modes using eigenvalue computations, numerical simulations and the concept of wave packet pseudo-modes. Three distinct branches of the family of algebraically decaying eigenmodes are identified. They can be superimposed to produce wavefronts propagating towards or away from the boundary layer and standing or travelling wave packets in the free stream. Their role in the exchange of information between the free stream and the attachment-line boundary layer for the swept Hiemenz flow is discussed. The concept of wave packet pseudo-modes has been critical in the analysis of this problem and is expected to lead to further insights into other shear flows in semi- or bi-infinite domains.

scholarly journals On the artificial wave packet development in a spanwise modulated boundary layer on the swept wing at Mach 2.5

2021 ◽  
Author(s):  
A. Panina ◽  
A. Yatskikh ◽  
A. Kosinov ◽  
Yu. Yermolaev ◽  
N. Semionov
Keyword(s):  
Boundary Layer ◽  
Wave Packet ◽  
Swept Wing

scholarly journals Propagation of the wave packet in a boundary layer of swept wing at Mach number 2

2017 ◽  
Author(s):  
Yury G. Yermolaev ◽  
Aleksey A. Yatskikh ◽  
Alexander D. Kosinov ◽  
Nickolay V. Semionov
Keyword(s):  
Boundary Layer ◽  
Mach Number ◽  
Wave Packet ◽  
Swept Wing

scholarly journals Evolution of localized artificial disturbance in 2D and 3D supersonic boundary layers

2018 ◽  
Vol 234 (1) ◽  
pp. 115-123 ◽  
Author(s):  
Aleksey Yatskikh ◽  
Yury Yermolaev ◽  
Alexander Kosinov ◽  
Nikolai Semionov ◽  
Alexander Semenov
Keyword(s):  
Boundary Layer ◽  
Wave Packet ◽  
Flat Plate ◽  
Boundary Layers ◽  
Plate Boundary ◽  
Hot Wire ◽  
Swept Wing ◽  
Artificial Disturbance ◽  
2D And 3D ◽  
Symmetric Shape

The evolution of a controlled broadband wave packet in flat-plate and swept-wing supersonic boundary layers was experimentally investigated at Mach number M = 2. The wave packet was introduced into the boundary layer by a localized pulse electrical discharge. The structure and evolution downstream of the wave packet were studied by hot-wire measurements. It was found that the wave packet has a symmetric shape in a flat-plate boundary layer, whereas there is asymmetry in case of a swept-wing one. The spectral analysis of the development of different modes of the wave packet was provided.

scholarly journals Excitation of localized wave packet in swept-wing supersonic boundary layer

2017 ◽  
Vol 115 ◽  
pp. 02015 ◽  
Author(s):  
Aleksey Yatskikh ◽  
Marina Rumenskikh ◽  
Yury Yermolaev ◽  
Aleksander Kosinov ◽  
Nikolay Semionov
Keyword(s):  
Boundary Layer ◽  
Wave Packet ◽  
Supersonic Boundary Layer ◽  
Swept Wing

scholarly journals Evolution of a localized wave packet in the boundary layer of the swept wing at M = 2

2019 ◽  
Vol 1382 ◽  
pp. 012048 ◽  
Author(s):  
A A Yatskikh ◽  
Y G Ermolaev ◽  
B V Smorodsky ◽  
A V Panina ◽  
N V Semionov ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Wave Packet ◽  
Swept Wing

Flow inhomogeneity influence on the wave packet development in a swept wing boundary layer at Mach number of 2.0

2020 ◽  
Author(s):  
Yu. G. Yermolaev ◽  
A. A. Yatskikh ◽  
A. D. Kosinov ◽  
N. V. Semionov
Keyword(s):  
Boundary Layer ◽  
Mach Number ◽  
Wave Packet ◽  
Swept Wing
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