• Theory
  • Introduction
  • BEM Theory
• Available BEM Codes
• Code Modifications
  • Modifications
  • Code Operators
  • Code Interface
• Adding Profiles
  • Blade Profile Design
  • Multiple Profiles
  • Additional Profiles
  • Adding Own Profile
  • Modelling Degradation
• Methodology
  • Systematic Study
  • Geometry
• Results
  • Introduction
  • Uniform Pitch Result
  • Twisted Blade Results
  • Hub Radius Results
  • Increasing Tip Radius (Maintaining Uniform Chord)
  • Increasing Tip Radius (Twisted Blade)
  • Blade Position Results
  • Chord
  • Taper
  • R.P.M.
  • Variable Profiles
  • Number of Blades
  • Contra Rotation
• Tools
  • Tools Intro
  • Xfoil
  • Rfoil

Additional Profiles

In order to make use of the multiple profile function it was thought that options to employ additional profiles should be included. This should allow a designer to investigate how using different blade section profiles may affect power output. In the programme, profiles are represented by individual subroutines which define the 2-dimensional lift and drag characteristics for that aerofoil cross-section. The original NACA 0012 subroutine was improved and subroutines were added for a NACA 63-418 section seen below, a NACA 63-424 section and a degraded NREL S814 section. The NACA 63-4xx sections were chosen as they were to be utilised on MCT’s SeaFlow (Fraenkel).The degraded NREL S814 section was added to allow us to investigate the effect of blade fouling. A detailed procedure for adding profiles follows.