JensenFactor: For a given distance x, computes the penalty factor for a turbine's wake.
Description
In Jensen's wake model, a wake cone is generated by a turbine based on the turbine's hub height z, its rotor radius r_0, the terrain's roughness length z_0 and the distance x between the turbine under investigation and a certain second point. z, r_0 and z_0 are taken from the FarmVars settings object, while x is to be provided.
Usage
JensenFactor(x)
Value
JensenFactor returns the a single number between 0 and 1, which can immediately be used a a penalty factor.
Arguments
x
must be a single value. Provide distance in meters.
Author
Carsten Croonenbroeck
Details
If a second turbine (B) is in a first turbine (A)'s wake, turbine B's power output must be penalized due to turbulence. This function computes the penalty factor for that wake.
References
Jensen, N. O. (1983). A note on wind generator interaction. Roskilde: Risø National Laboratory. Risø-M, No. 2411
See Also
Use JensenAngle to compute the wake cone and with it, use JensenTrapezoid to see if another turbine B is in turbine A's wake. Apply JensenFactor only if this is the case.
JensenFactor(500)
## Provided that turbine B is in turbine A's wake and that the two turbines are 500 meters apart,## turbine B must be penalized by a factor of 0.7952.