Parametric study of a diffuser for horizontal axis wind turbine power augmentation

Parametric study of an empty diffuser geometric parameters and shape for a wind turbine using CFD analysis

“…The flange shape was not considered in the previous literature. The flange height with minor ratio differences was taken as the significant parameter for diffuser parametric optimizations [ 16 , 27 , 28 ], and [ 29 ].…”

“…Specifically, for the diffuser-augmented wind turbine [ 15 ], the optimum size and shape of the diffuser were not adequately investigated and identified. In a 2D CFD study [ 16 ] with the length of the diffuser (( ) and flange height ( it has been shown that using a diffuser increased wind turbine efficiency, enhanced velocity ratio of 1.5, and more than twice the power potential. The possibility of growing a diffuser-augmented horizontal turbine is shown, and the result is improved.…”

“…The parametric effect of flange angle on the performance of diffuser-augmented wind turbines was investigated in the range of - (to the vertical axis) using CFD. Superior results are obtained with optimum low pressure at the diffuser outlet and more fluid flow through the diffuser at a flange angle, for reducing cost and producing high power output for the same length and diameter of the diffuser [ 16 , 22 ], and [ 21 ]. It is understood that there is much more to be done in future work [ 16 ].…”

“…Superior results are obtained with optimum low pressure at the diffuser outlet and more fluid flow through the diffuser at a flange angle, for reducing cost and producing high power output for the same length and diameter of the diffuser [ 16 , 22 ], and [ 21 ]. It is understood that there is much more to be done in future work [ 16 ]. However, previous results do not give tangible results about the best possible shape of the diffuser and optimum design parameters like opening angles ( 2° to 22°), inlet shroud angles ( 8° to 24°), flange height ratios from , flange angles ( 0° and 15°), and shape of diffusers and flanges as indicated in Table 1 of diffusers [ 15 , 16 , [21] , [22] , [23] , [24] ], and all these parameters were studied and analyzed in this work.…”

“…It is understood that there is much more to be done in future work [ 16 ]. However, previous results do not give tangible results about the best possible shape of the diffuser and optimum design parameters like opening angles ( 2° to 22°), inlet shroud angles ( 8° to 24°), flange height ratios from , flange angles ( 0° and 15°), and shape of diffusers and flanges as indicated in Table 1 of diffusers [ 15 , 16 , [21] , [22] , [23] , [24] ], and all these parameters were studied and analyzed in this work.…”