Below is a table of operators and common logic operators used within the code.
Table of Operators
(listed as introduced in code) |
Operator |
Units |
Value |
Explanation |
q,nb2 |
Number |
1-10 |
Number of blades |
l |
Meters |
1-10 |
Length of blade |
bl |
Number |
1-5 |
Subroutine selection for blade geometry |
second |
Logic |
T or F |
Logical operator used to run contra subroutines |
iuout |
Number |
6 |
Used for file output in UNIX |
iuin |
Number |
5 |
Used for file input in UNIX |
pi |
π |
3.14159 |
Constant |
pca |
Degrees |
0.001- 90 |
Pitch control angle |
fspc |
Logic |
T or F |
Full span pitch control,defined but not used |
n |
Number |
1-6 |
Subroutine selection for blade profile |
d |
Kg/m3 |
1027 |
Density of fluid |
v |
m/s |
0.01-10 |
Tidal speed |
rt |
Meters |
0.1-50 |
Blade tip radius |
rr |
Meters |
0.1-10 |
Blade root radius |
xt, xt2 |
Ratio |
0.01-10 |
Tip speed ratio, Ωr/v, (rad/s*m)/(m/s) |
uc |
Meters |
0.01-5 |
Uniform chord length |
uth |
Degrees |
0.01-90 |
Uniform pitch angle |
throot |
Degrees |
0.01-90 |
Pitch angle at the root of blade |
thtip |
Degrees |
0.01-90 |
Pitch angle at the tip |
croot |
Meters |
0.01-5 |
Chord length at root |
ctip |
Meters |
0.01-5 |
Chord length at tip |
el |
Meters |
|
Blade element length |
pc |
Degrees |
0 |
Pitch control, defined but not used |
r |
Meters |
|
Radius of blade element being analysed |
x |
Ratio |
max = xt |
Blade element speed ratio |
j |
Number |
1 |
Used for beginning of counting loop |
i |
Number |
j + 1 |
Tracks the number of iterations performed |
thav,beta2 |
Degrees |
|
Average pitch angle |
cav |
Meters |
|
Average chord |
sl,sl2 |
Proportion |
0-1 |
Solidity, ratio of area taken up by blades |
iter |
Number |
|
Tracks the number of a & a’ iterations |
a1,a2,a4 |
Proportion |
0-1 |
Axial induction factor, a |
b1,b2,b4 |
Proportion |
0-1 |
Tangential induction factor, a’ |
ph,ph2 |
Degrees |
|
Inflow angle to blades on rotor 1 |
al,al2 |
Degrees |
|
Angle of attack |
f,fz |
Proportion |
0-1 |
Tip loss factor |
cn,cn2 |
Number |
|
Lift coefficient |
ct,cn2 |
Number |
max = 2 |
Drag Coefficient |
w,w2 |
m/s |
|
Relative velocity between blade and stream |
fax,fax2 |
Newton |
|
Axial force/thrust |
ftan |
Newton |
|
Tangential force/thrust |
pt |
Ratio |
2 or 4 |
Proportion of thrust to rotor 1 |
cp,csum,cp2,csum2 |
Efficiency Ratio |
0-0.593 |
Power coefficient |
tl,tl2 |
Newton |
|
Thrust loading |
bm,bsum |
KNm |
|
Blade root bending moment |
p |
kW |
|
Combined power at all blade elements |
t |
kNm |
|
Combined torque onto the shaft |
s |
RPM |
|
rotational speed |
e |
Logic |
T or F |
End program |
cl |
Equation |
|
Coefficient of lift |
cd |
Equation |
|
Coefficient of drag |
NOTE: Operators with 2 or 4 after them are calculated for 2nd contra |
