Patent ID: 8821117

Claim:
A fluid turbine apparatus for use with at least one fluid turbine to increase the fluid velocity contacting said fluid turbine, said fluid turbine apparatus comprising: a convergent section, said convergent section comprising an entry and an exit, said entry having an area higher than said exit, said convergent section having a first ratio being the entry area over the exit area; a fluid turbine section adjacent to said exit of said convergent section, said fluid turbine section comprising said at least one fluid turbine; a divergent section adjacent to said fluid turbine section, said divergent section comprising an entry and an exit, said entry having an area lower than said exit, said divergent section having a second ratio being the exit area over the entry area; wherein at least one of the convergent section and the divergent section comprises a rectangular cross-section, wherein all fluid contacting said fluid turbine enters through said convergent section and exits through said divergent section and wherein said fluid turbine apparatus has a third ratio being said exit area of said divergent section over said entry area of said convergent section, and wherein said first ratio is higher than 1.5, said second ratio is higher than 4.0 and said third ratio is comprised between 1.5 and 10.