wflo (version 1.2)

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)

Arguments

x

must be a single value. Provide distance in meters.

Value

JensenFactor returns the a single number between 0 and 1, which can immediately be used a a penalty factor.

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: Ris<U+00F8> National Laboratory. Ris<U+00F8>-M, No. 2411

See Also

Use JensenAngle to compute the wake cone and with it, use IsInWake to see if another turbine B is in turbine A's wake. Apply JensenFactor only if this is the case.

Examples

# NOT RUN {
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.
# }