|
|
Vortex structures generated by dbd plasma actuator
Procházka, Pavel P.
This article deals with the research of vortex structures generated by a plasma actuator. Plasma actuators belong to devices that can be used for active flow control. Plasma actuator flow control has been in the center of interest for the last two decades. However, one can find only a limited amount of information dealing with the physical principal of this phenomenon. The conclusion of this article is formulated to give an explanation of physical laws acting during generating, evaluating and decay vortex structures in a complex way to ensure that results could be apply in the future for more applicable research.
|
|
| |
|
|
Parametric study of vortex train generated by plasma actuator in dependency on input voltage waveform
Procházka, Pavel P. ; Uruba, Václav
This article is based on previous work of authors. The vortex train is created by a plasma DBD actuator after application of low-frequency amplitude modulation on high-frequency high-voltage carrier waveform. Data acquisition of flow field around actuators will be performed using time-resolved PIV measurement technique in plane parallel to flow and in cross-section. Phase-averaging will be used due to pseudo-periodical character of this process. The vortex behaviour dependency on modulation frequency, duty cycle, voltage value, electrode gap and other parameters will be shown. The generated flow patterns are to be applied for control of a boundary layer.
|
|
|
Identification of vortex structures in dynamicstudio software
Procházka, Pavel P. ; Uruba, Václav
Identification of vortex structures from experimentally gained velocity field is topical problem for last decades. Optimal identification method should detect vortex and its generation, evolution, interaction and decay both in time and in space. Since there is no exact definition of vortex structure, this task for any identification method is very difficult and results are not very often representative.layers characteristics, the mathematical model Abu-Darag was utilized in order to enable the prediction of the main boundary layer integral parameters.
|
|
| |
|
| |
|
| |
|
|
Actuators for Flow Control Based on Plasma Principle
Procházka, Pavel P. ; Uruba, Václav ; Šonský, Jiří
One can distinguish between two types of flow control, passive and active. Active flow control has a few advantages. The biggest advantage is a possibility to influence the flow only if there is a need. By contrast, the passive control acts all the time and for all regimes and this is not good in terms of fuel consumption, for example. Active flow control provides the necessary momentum to the shear layer from an external source, as opposed to passive control which uses the momentum of free stream of fluid.
|
|
| |
|
| |
guest ::
RSS feed.