Patent ID: 8638002

Claim:
A Karman vortex street generator, comprising: a shell with two opened ends, inlet end and outlet end; permanent magnates, whose N pole and S pole are located on the corresponding surfaces of said shell, forming a magnet field; a vortex generating body mounted inside said shell for producing a Karman vortex street in response to fluid flow across the vortex generating body; and a metal winding located in the magnet field for cutting the magnetic lines of force that are formed between the permanent magnates under the action of the Karman vortex street to produce induced current; wherein said vortex generating body being without cantilever arms extending therefrom; wherein the permanent magnates, whose height, h, follows the formula h=½(H−L) to ½(H+L), where H is an interior height of the shell, L is a characteristic length of the vortex generating body; wherein the two corresponding surfaces of said shell are behind said vortex generating body, between which the magnet field is formed and the metal winding having a rotating function around a shaft is located; wherein the distance between the vortex generating body and the permanent magnates along a flow direction at the inlet end is larger than or equal to 2L.