Parameter definitions

[ncgarc]

Hi team,

I'm an undergrad intern for Sandia working with Vince in the Water Power Technologies group to compare legacy codes for turbine modeling. I'm familiar with most of the turbine parameters listed in CreateGeom.m but don't recognize a few, namely:
% 7 bi: Blade planform incidence (deg, w.r.t. rotor disk plane, positive LE into the wind (-x)) % 8 eta: Blade mount point ratio ((distance behind leading edge of the blade mount point) / (chord)) % 9 bCone: Blade coning angle (deg, positive tip into the wind (-x))
Additionally, I'm unsure whether bTwist
bTwist: Blade planform twist at each element end (deg, w.r.t. blade planform plane (rotor disk plane when bi =0), positive LE into the wind (-x), NBElem+1 elements ordered root to tip)
includes blade pitching or is strictly the twist of the unpitched blade.

Do you have a sketch showing exactly how these parameters are defined? Thank you in advance!

[whophil]

I do not have such a sketch, but perhaps @jcokemurray or @mbarone81 do - I believe they were the original authors of these scripts. It should be noted that these scripts are likely around ten years old now.

Without such a diagram, you should still be able to figure out what exactly is happening by following the code of the transformation methods.