• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • Tagged with
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Aerodynamic Analysis of Reflex Airfoils at Low Reynolds Numbers

Meyer Ströborg, Alexander Elliott January 2022 (has links)
Low Reynolds number airfoil analysis has become increasingly significant as urban air mobility vehicles and unmanned aerial vehicles surge in popularity. The Green Raven project at KTH Aero aims to use reflex airfoils where little data is available beyond classical analysis. Viscous formulations of the panel method and computational fluid dynamics (CFD) have been used to simulate lift, drag and moments for the MH61 and MH104 airfoils at different angles of attack (AOAs). XFOIL and CFD turbulence models such as Spalart-Allmaras (SA), k-w Shear Stress Transport (SST) with and without damping coefficients were used. The strengths and limitations of each model were used to justify results. Due to clear computational advantages, XFOIL produced adequate results and is tailored toward use in initial design stages where repeated measurements are crucial. The SA turbulence stood out as the model produced accurate results in a reasonable time. The abundance of published CFD material comparing different turbulence models increased the credibility of the results. The two airfoils had similar lift and drag characteristics at AOAs of 0-6 deg while the MH104 was superior near stall. However, due to the lack of experimental data of the airfoils no particular model could be commended or verified.

Page generated in 0.0347 seconds