Računalna simulacija opstrujavanja aeroprofila s pretkrilcem

undergraduate thesis

• Title (english): Numerical simulation of fluid flow over airfoil with leading edge slat
• Author: Matej Burum
• Mentor: Severino Krizmanić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2025-02-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Pretkrilca na avionima imaju ključnu ulogu u poboljšanju aerodinamičkih karakteristika krila pri velikim napadnim kutevima, omogućujući povećanje uzgona i odgađanje zastoja. Posebno značajnu primjenu imala su na avionu Messerschmitt Bf 109G, gdje su automatska pretkrilca korištena za poboljšanje upravljivosti i stabilnosti pri manevarskim uvjetima.
U drugom poglavlju obrađena je teorija iza pretkrilca, odnosno na koji način dolazi do separacije strujanja i kako se ta pojava može odgoditi. U trećem poglavlju obrađena je metoda konačnih volumena, koja je osnova za daljni numerički proračun.
U ovome radu provedene su računalne simulacije opstrujavanja aeroprofila s pretkrilcem primjenom metoda računalne dinamike fluida. Pri izradi rada su se koristili slobodno dostupni računalni alati FreeCAD, Salome, OpenFOAM biblioteka računalnih programa koja se temelji na metodi konačnih volumena. Izrađeni su geometrijski modeli dviju konfiguracija aeroprofila, s otvorenim i zatvorenim pretkrilcem. Provedeno je više računalnih simulacija za svaku od konfiguracija, a rezultati su uspoređeni s rezultatima računalnog programa xFoil, koji se temelji na teorijiama potencijalnog strujanja i graničnog sloja

Abstract (english)

The leading-edge slats on aircraft play a crucial role in improving the aerodynamic characteristics
of the wing at high angles of attack, enabling increased lift and delaying stall. They were
particularly significant on the Messerschmitt Bf 109G, where automatic slats were used to enhance
maneuverability and stability under flight conditions requiring high agility.
The second chapter covers the theory behind slats, specifically how flow separation occurs and
how this phenomenon can be delayed. The third chapter discusses the finite volume method, which
serves as the foundation for further numerical calculations.
In this study, computational simulations of airflow over an airfoil with a slat were conducted using
computational fluid dynamics (CFD) methods. Free and open-source computational tools such as
FreeCAD, Salome, and the OpenFOAM software library—based on the finite volume method—
were used in the research. Geometric models of two airfoil configurations were created, one with
an open slat and one with a closed slat. Multiple computational simulations were performed for
each configuration, and the results were compared with those obtained using the xFoil software,
which is based on potential flow and boundary layer theories.

• Keywords: računalna dinamika fluida; granični sloj; aeroprofil; pretkrilce; OpenFOAM
• Keywords (english): Computational Fluid Dynamics; boundary layer; airfoil; slat; OpenFOAM
• Language: croatian
• URN:NBN: urn:nbn:hr:235:893529
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-02-24 18:49:06