Patent ID: 8672622

Claim:
A fluid machine which utilizes an unsteady flow, comprising: a non-streamline casing configured to form a vortex street on a downstream side from internal and external flows, wherein the casing includes an inlet and a throat having an internal diameter which is less than an internal diameter of the inlet, wherein a cross section of a flow passage from the inlet to the throat is gradually reduced; and an impeller disposed inside the casing at the throat, wherein the casing comprises a vortex generator configured to form the vortex street on the downstream side, the vortex generator is provided with a phase control structure configured to regulate, in a plane including a rear end face of the casing, a phase of a vortex formation that fluctuates along a circumferential direction within the plane including the rear end face, and configured to clarify a cell structure to be formed along the circumferential direction of the casing to fix, on a surface of the casing, positions of respective cells into a plurality of segmented regions arranged within the plane including the rear end face, and the phase control structure is configured to increase a velocity of the internal flow, wherein the phase control structure comprises phase control plates arranged on an outer circumference of the vortex generator such that each of the phase control plates straddles the vortex generator, wherein the phase control is arranged so as not to extend into an outlet of the casing.