![]() In the review of Moreau published in ( 2007), one can find the basic of plasma actuators and a review of experimental flow control investigations. However, there are few articles that can serve as reference review paper for groups starting experiments with plasma actuators. As mentioned previously, dielectric barrier discharge for flow control is a quickly evolving research field. Sometimes papers simply consist of reproducing experiments that have already been conducted and for which no relevant new results are reported. Most of the time, the presented results are original and compose a real improvement of the physical knowledge and performances of plasma actuators. Several new articles are published per month. A part of them focus on the use of plasma discharge for new flow conditions or new aerodynamic configurations, when another part looks at a better insight into the physical aspects of the electromechanical conversion with objective of improving the performances of dielectric barrier discharge plasma actuators. A complete list of studies related to plasma–flow interactions for aeronautical applications is no longer possible because the large number of groups in the world working on or using plasma actuators. 2011) or adaptive optical lens by plasma discharge (Neiswander et al. Recently, new directions emerge such as the use of plasma discharge as flow sensor (Matlis et al. Again, this original aspect takes its essence when used in closed-loop approach. Instead of manipulating a flow dynamic, the actuator can be used as a generator of predefined perturbations easily tuned by the applied electrical signal (Widmann et al. 2011 Grundmann and Tropea 2008 Kriegseis et al. In most of these papers, the actuator is used in context of open-loop control, but plasma discharges find a new route in the construction of closed-loop strategies by using DBD (Lombardi et al. 2010 Grundmann and Tropea 2007 Hanson et al. 2008) or boundary layer laminar-to-turbulent transitions (Joussot et al. 2012 Jukes and Choi 2009), developing shear layers (Sosa et al. 2006 Benard and Moreau 2011 Kelley et al. Plasma actuators, and more specifically dielectric barrier discharge actuators, have demonstrated their authority to manipulate the dynamics of different flows, such as separated flows (Corke and Post 2005 Little and Samimy 2010 McLaughlin et al. ![]() Subsequently, the produced body force, despite being low-pass filtered by fluid mechanical laws (viscosity, energy exchanges, dissipation) to produce electric wind, has a high bandwidth. These charged species are produced by physical phenomena such as ionization, recombination, attachment, detachment and photoionization, which occur at timescale of a few picoseconds (Boeuf et al. Indeed, the EHD force (also referred as EFD force for electro-fluid dynamic) and the resulting produced flow called electric wind or ionic wind are due to electric field that acts on charged species. The amplitude and frequency of the electrohydrodynamic (EHD) force produced by the surface plasma are directly connected to the driven electrical signal, this being a clear advantage for parametric studies on the sensibility of one flow to well-defined perturbations. Beside, their location can be changed faster than other active actuators that require a new model for each new position of actuation. They have the capability to be mounted at the surface of linear or curved objects with a minimal protrusion in the flow. The sudden interest for surface dielectric barrier discharge (DBD) energized by AC high voltage for manipulating airflows was initially motivated by the easy implementation of these actuators and a possible retrofitting on existing airfoils. Rapidly, the number of publications in journals and conference exponentially grows to finally become a full interdisciplinary research field. Then, different groups already having background experiences on corona discharges and their interactions with quiescent or moving flows formed a new highly motivated community that contributes to the dissemination of the advantages and relevancy of non-thermal plasma discharges as an alternative to conventional flow actuators (Moreau 2007 Corke et al. ![]() This new application arose mostly thanks to the pioneer work done at University of Tennessee where the potential of non-thermal surface plasma for producing a thin wall jet was demonstrated (Roth and Sherman 1998). ![]() Initially devoted to surface treatment, ozone production or decontamination, weakly ionized gas formed at the surface of a dielectric material emerged as a flow actuator at the end of the 1990s. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |