This paper by N.O. Jensen, published in 1983, discusses a simple model for the wake behind a wind generator and its application to both circular and linear arrays of wind turbines. The model is compared with experimental data from full-scale tests, showing good agreement. The wake is treated as a turbulent wake or negative jet, with the momentum deficit spread linearly over the downwind distance. The model is then extended to account for multiple wake interactions in a linear array of wind turbines. The paper provides detailed calculations and examples to illustrate the reduction in power output due to wake interactions, particularly in circular arrays. The results show that the power reduction is significant but varies with wind direction and the spacing between turbines. The study concludes that while the linear array can experience substantial power losses, these losses are not uniform across all wind directions and are generally less severe than those in a circular array.This paper by N.O. Jensen, published in 1983, discusses a simple model for the wake behind a wind generator and its application to both circular and linear arrays of wind turbines. The model is compared with experimental data from full-scale tests, showing good agreement. The wake is treated as a turbulent wake or negative jet, with the momentum deficit spread linearly over the downwind distance. The model is then extended to account for multiple wake interactions in a linear array of wind turbines. The paper provides detailed calculations and examples to illustrate the reduction in power output due to wake interactions, particularly in circular arrays. The results show that the power reduction is significant but varies with wind direction and the spacing between turbines. The study concludes that while the linear array can experience substantial power losses, these losses are not uniform across all wind directions and are generally less severe than those in a circular array.