Aerodinamičke karakteristike tankog deformabilnog aeroprofila u oscilatornom gibanju

Vojković, Tea (2018) Aerodinamičke karakteristike tankog deformabilnog aeroprofila u oscilatornom gibanju. = Oscillating thin deformable airfoil aerodynamic characteristics. Undergraduate thesis , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Matijašević, Dubravko.

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Abstract (Croatian)

U radu se promatraju nestacionarne aerodinamičke pojave pri opstrujavanju tankog deformabilnog aeroprofila u potencijalnom strujanju. Pojedini modovi deformabilnog aeroprofila opisani su Čebiševljevim polinomima prve vrste. Prva dva moda predstavljaju kruta gibanja poniranja i propinjanja, dok viši modovi predstavljaju elastične deformacije aeroprofila. Pri računanju aerodinamičkih karakteristika, prati se Theodorsenov pristup koji je izvorno upotrebljen u širem okruženju za računanje aeroelastičnih svojstava krutog aeroprofila sa zakrilcem. U duhu Theodorsenove metode, za dobivanje ravne ploče koja služi kao referentni aeroprofil, korišteno je preslikavanje Žukovskog. Necirkulacijski tok opisan je plahtom izvora i ponora distribuiranih po stijenki cilindra čije su snage određene uvjetom nepropusnosti. Kuttin uvjet je zadovoljen kada se tome doda cirkulacijski tok, izračunat pomoću vrtložne plahte na aeroprofilu i njegovom tragu, bez narušavanja rubnog uvjeta. Izrazi za aerodinamički uzgon i moment propinjanja dani su u frekvencijskoj domeni.

Abstract

In this thesis unsteady aerodynamic loads on thin deformable airfoil in potential flow are considered. The deformation of the airfoil is described by the Chebychev polynomials of the first kind. First two polynomials represent rigid body motion, pitching and plunging, while higher order polynomials represent elastic deformation of the airfoil. Method proposed by Theodorsen, originaly used in broader context of uttering airfoil with flap, is applied for aerodynamic load calculation. The Joukowski conformal mapping was used to transform the flow about a circle into a flow about a flat plate, which serves as reference airfoil. Noncirculatory flow consists of source sheet on the upper surface of circle and sink sheet on the lower surface. The strenght of the sheet is derived from the boundary condition. To satisfy Kutta condition, circulatory flow, which is derived by using a vortex sheet on the airfoil and in the wake, is superimposed.

Item Type: Thesis (Undergraduate thesis)
Uncontrolled Keywords: Teorija tankih aeroprola, oscilatorno gibanje, necirkulacijski tok, cirkulacijski tok, Theodorsenova funkcija
Keywords (Croatian): Thin airfoil theory, oscilatory motion, noncirculatory flow, circulatory flow, Theodorsen function
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: 29 Jun 2018 12:01
Last Modified: 24 Jul 2018 09:37
URI: http://repozitorij.fsb.hr/id/eprint/8605

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