Analiza uzgona kombinacije tijelo-noseća površina

Zrnić, Dino (2016) Analiza uzgona kombinacije tijelo-noseća površina. = Lift analysis for the body-lifting surface arrangement. Undergraduate thesis , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Vrdoljak, Milan.

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Abstract (Croatian)

Cilj završnog rada je dobiti raspodjelu cirkulacije na krilu, intenzitet izvora i dipola na tijelu te uz pomoć njih dobiti koeficijent ukupne normalne sile kombinacije tijelo-noseća površina. Razvijena metoda oslanja se na dvije različite metode: Weissinger metodu noseće linije za krilo i metoda izvora i dipola za tijelo. Strujanje fluida oko simetričnog krila modelira se potkovičastim vrtlozima, dok strujanje oko tijela modelira se linijskim izvorima i dipolima. Zbrajanjem sa potencijalnim strujanjem iz beskonačnosti i postavljanjem rubnih uvjeta nepropusnosti površine dobivamo matematički model nazvan dipol-izvor-vrtlog (DIV). Kombinaciju dobivamo postavljajući matematički model tako da uzimamo utjecaj vrtloga na kontrolne točke krila i tijela te utjecaj tijela na kontrolne točke krila i tijela. S rasporedom brzina na kontrolnim točkama na tijelu i krilu, iz Bernoullijeve jednađžbe može se odrediti raspored tlakova, a iz njih raspored koeficijenta uzgona za određene napadne kutove. Model DIV, izrađen u programskom paketu MATLAB, ograničen je na kombinaciju trapeznog krila simetričnog profila bez dihedrala i osnosimetričnog tijela pod malim napadnim kutom. Rezultati modela DIV uspoređeni su sa dostupnim eksperimentalnim rezultatima i rezultatima drugih numeričkih modela. U radu je analiziran i utjecaj kuta strijele krila na uzgon kombinacije.

Abstract

The main aim of the dissertation is to obtain distribution od circulation on the wing, the intensity of sources and dipoles on the body, and with the help of them gain coefficient of the total normal force of combination wing-body. The developed method relies on two different methods: Weissinger method for wing and the method of sources and dipoles for the body. Fluid flow around symmetrical wings simulate vortexes, while flow around body simulate inline sources and dipoles. Summing up with the potential flow from infinity, and setting boundary conditions of impermeability surfaces we are getting a mathematical model called dipoles-sources-vortices (DIV). We are gaining combination by setting mathematical metod so that we take influence of the vortex at checkpoints on wings and body, and influence of body at the checkpoint on wings and body. With velocity distribution at the control points on the body and wing, from Bernoulli equation can be determined distribution of pressures, and from them distribution of coefficient of lift for certain angles of attack. Model DIV developed in program package Matlab, is limited to a combination of trapezoidal profile symmetrical wings without dihedral and axisymetrical body at a low angle of attack. Results DIV models are compared with available experimental results and the results of other numerical models. This dissertation analyzes the influence of angle of the arrow wings to lift combination.

Item Type: Thesis (Undergraduate thesis)
Uncontrolled Keywords: model noseće linije, model izvora i dipola, kombinacija tijelo-noseća površina, utjecaj kuta strijele krila
Keywords (Croatian): model of supporting line, model of sources and dipoles, combination wing-body, influence of angle of arrow
Subjects: TECHNICAL SCIENCE > Aviation, rocket and space technology > construction and establishment of a spacecraft
Divisions: 1300 Department of Aeronautical Engineering > 1320 Chair of Aircraft Dynamics
Date Deposited: 02 Mar 2016 09:26
Last Modified: 02 Mar 2016 09:26
URI: http://repozitorij.fsb.hr/id/eprint/5130

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