Research of aerodynamic characteristics of wing airfoils

Laurynas Naujokaitis

Doctoral dissertation

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The present dissertation analyses the impact of basic airfoil parameters on its aerodynamic characteristics. By using computational methods, experimental research and comparative analysis the study aims to analyse and assess the impact of turbulator on airfoil drag in order to enhance the accuracy of maximum lift predicting. The research object of the present dissertation is the aerodynamic characteristics of airfoil, and aim of research is to analyse and assess the impact of turbulator on airfoil drag, to determine the interdependence between its shape, location and place of transition, to enhance the accuracy of methods for predicting of maximum lift for average Reynolds numbers.

The dissertation consists of an introduction, four chapters, and general conclusions, list of references and list of publications by the author.

In the introduction the research problem and topicality of the dissertation are discussed. Research object is described, aim of the dissertation and research goals are formulated, research methodology, scientific innovation of dissertation, practical significance of the study results, and the defended arguments are discussed. In the last part of the introduction, publications and conference presentations on the topic of the dissertation by the author and the structure of the dissertation are presented.

In the first chapter the impact of airfoil characteristics on flight characteristics of airplane and sailplane is analysed. The importance of aerodynamic characteristics and factors which allow improving them are determined. Experimental research of sailplane free flight and methods of experimental research are analysed.

The second chapter discusses computational methods for modeling airfoil aerodynamic characteristics. Computational research and comparative analysis of results obtained by different computational modeling methods are carried out. Impact of laminar separation bubble, fixed transition and its place on airfoil drag is analysed.

The third chapter analyses impact of turbulator shape, location and transition on airfoil aerodynamic characteristics. Experimental research methodology and equipment are described. Results of computational modeling and experimental research and their comparative analysis are presented. Results of computational modeling are also compared to results of other experimental studies published in scientific literature.

The fourth chapter provides an approach for predicting maximum lift. Performed computational analyses are compared with experimental research results published in scientific literature. An improved methodology is presented, which allows predicting maximum lift for average Reynolds numbers more accurately.

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Imprint No:
145×205 mm
136 p.
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