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Advisor(s)
Abstract(s)
Esta dissertaĆ§Ć£o teve como objetivos principais o estudo, projeto, construĆ§Ć£o e avaliaĆ§Ć£o,
de dois sistemas de visualizaĆ§Ć£o de escoamento, nomeadamente de dois sistemas schlieren, cujo
objetivo final serĆ” o emprego destes sistemas como instrumentos de estudo para atuadores a
plasma do tipo DBD. Com o intuito de melhor compreender o vento iĆ³nico, um fenĆ³meno caracterĆstico
dos atuadores a plasma, que consiste na formaĆ§Ć£o de um āāsoproāā, uma movimentaĆ§Ć£o
de ar, que se dĆ” no mesmo sentido em que se dĆ” a formaĆ§Ć£o das descargas de plasma.
No decorrer da presente dissertaĆ§Ć£o, o leitor Ć© guiado pelo processo de criaĆ§Ć£o de dois
sistemas schlieren, sistemas estes que apĆ³s o seu correcto projecto e sua correta montagem,
nos permitiram realizar uma vasta gama de ensaios, alguns dos quais temos o prazer de partilhar
com o leitor interessado. Existem neste estudo dois tipos principais de ensaios, um desses tipos
tem como objetivo principal o estudo do prĆ³prio sistema schlieren, a sua calibraĆ§Ć£o, o outro
grupo de ensaios visa primeiramente testar o desempenho dos sistemas construidos na avaliaĆ§Ć£o
do escoamento induzido por atuadores a plasma, e por fim claro avaliar o prĆ³prio escoamento
induzido.
Apesar de ambos os sistemas schlieren projetados, terem objetivos diferentes, no que ao
estudo do escoamento induzido diz respeito, ambos permitem a visualizaĆ§Ć£o do escoamento induzido,
por esse motivo Ć© tambĆ©m feita uma pequena comparaĆ§Ć£o entre as visualizaƧƵes obtidas
por ambos os sistemas aqui desenvolvidos. SĆ£o tambĆ©m realizados ensaios por forma a testar
os componentes constituintes de cada um dos sistemas. As dimensƵes dos alinhamentos utilizados,
foram rigorosamente cumpridas, sendo que estas se apresentam como uma das melhores
maneiras de melhorar a resoluĆ§Ć£o dos sistemas.
Testaram-se atuadores de plasma do tipo DBD, que foram previamente montados em uma
superfĆcies plana e devidamente colocados no local de teste dos alinhamentos Schlieren desenvolvidos,
por forma a ser possivel visualizar o escoamento induzido pelo mesmo, fenĆ³meno esse
que Ć© invisĆvel a olho nĆŗ. Os sistemas schlieren mostraram-se sensiveis o suficiente para serem
capazes de produzir resultados relativamente ao escoamento induzido pelo atuador a plasma.
A tƩcnica de schlieren orientado para fundo Ʃ aqui proposta pela primeira vez para analisar
quantitativamente o campo de temperaturas criado, por atuadores a plasma do tipo DBD em
funcionamento.
This dissertation has as main objebtives, the study, project and set up of two schlieren systems. The ultimate goal of this dissetation is that the developed systems are sensitive enough, so we can use them to study DBD plasma actuators. In order to better understand the ionic wind, wich is a phenomena associated with the plasma actuators, that consists on the formation of a āāblowāā, an air movimentation, which has the same direction of propagation as the plasma has of formation. During the present dissertation, the reader is guided through the process of creation of two schlieren systems, systems whose aftr is correct project and after his correct assembly, allowed us to preform a series of diferent experiments, some of wich we have the pleasure to share with the intereted reader. There are two main types of experimental test during this dissertation, one of them his main goal is to study and test the shlieren systms themselfs, ande the other one firstly aims to test the preformance of the system when trying to visualize the ionic wind, lastly to evaluate the DBD actuador ionic wind and better understand it. Dispite both project systems have diferent goals in the study of the DBD, they stll have something in common, and that something is that they both can produce visualizations, of the ionic wind, therefore we also compair the preformance of both systems and discuss the viability of both as a tool to study the plasma actuators. Also a lot of expeimental test are done, in order to test the components of the system. The dimensions we specify during this dissertations are of extreme imortance becouse, the reltive distance between componentes, is one of te beat way to increse sensitivity of the system. The tested DBD plasma actuators were previously mounted on a flat plate, and correctly placed in the test zone of the developed schlieren alignment, wich will allows to see what before ws invisible, the ionic wind cannot be seen by the human naked eye. The developed systems showed sensitive enough to produce good results about the induced flow of a DBD plasma actuator. The background oriented schlieren technique is here proposed, for te first time, in order to measure quantitatively, the temperature distributions field, caused by a functioning DBD plasma actuator.
This dissertation has as main objebtives, the study, project and set up of two schlieren systems. The ultimate goal of this dissetation is that the developed systems are sensitive enough, so we can use them to study DBD plasma actuators. In order to better understand the ionic wind, wich is a phenomena associated with the plasma actuators, that consists on the formation of a āāblowāā, an air movimentation, which has the same direction of propagation as the plasma has of formation. During the present dissertation, the reader is guided through the process of creation of two schlieren systems, systems whose aftr is correct project and after his correct assembly, allowed us to preform a series of diferent experiments, some of wich we have the pleasure to share with the intereted reader. There are two main types of experimental test during this dissertation, one of them his main goal is to study and test the shlieren systms themselfs, ande the other one firstly aims to test the preformance of the system when trying to visualize the ionic wind, lastly to evaluate the DBD actuador ionic wind and better understand it. Dispite both project systems have diferent goals in the study of the DBD, they stll have something in common, and that something is that they both can produce visualizations, of the ionic wind, therefore we also compair the preformance of both systems and discuss the viability of both as a tool to study the plasma actuators. Also a lot of expeimental test are done, in order to test the components of the system. The dimensions we specify during this dissertations are of extreme imortance becouse, the reltive distance between componentes, is one of te beat way to increse sensitivity of the system. The tested DBD plasma actuators were previously mounted on a flat plate, and correctly placed in the test zone of the developed schlieren alignment, wich will allows to see what before ws invisible, the ionic wind cannot be seen by the human naked eye. The developed systems showed sensitive enough to produce good results about the induced flow of a DBD plasma actuator. The background oriented schlieren technique is here proposed, for te first time, in order to measure quantitatively, the temperature distributions field, caused by a functioning DBD plasma actuator.
Description
Keywords
Atuador A Plasma Dbd Schlieren Vento IĆ³nico