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by _by Leon SantenSanten_
### 9/12/2020 - I began Coursera Course
### 9/10/2020 - First Semester Call with Jeff
Notes - Wind Turbine ISR-G (view source)
Revision as of 16:20, 23 September 2020
, 16:20, 23 September 2020no edit summary
These are notes for my wind turbine independent study with Jeff Dusek.
## 9/24/2020 ### Statistical Analysis of Wind Speeds and Turbulence - Navier-Stokes equation (evolution equation) to calculate wind speeds in space- statistical analysis, spectra, turbulence intensity is obtained by mean wind speed and standard deviation of wind speeds- every wavelength (after Fourrier transform) can be thought of as a length scale- wind vector (u, v, w)- integral length scale; from time series, we compute auto-correlation function- turbulence spectra- averaging periods of 10 min are commonly used; 30 min perios for turbulence studies; the larger integral time scale, the larger should be averaging period; sampling frequencies should be much smaller than integral time scale- you have to detrend te time series to get rid of high frequency fluctuation ## 9/17/2020 - Wind Profiles
__What I did__:
- reading on the efficiency of vertical turbines vs conventional turbines
- we have a hight surface roughness probably around z_0=0.4 ([wind profiles](https://www.coursera.org/learn/wind-energy/lecture/wpRiT/wind-profiles))
site assessment - take photography and topography
