Abstract: In a fluid machine, there is provided each diffuser flow passage for making uniform a flow in a downstream of a diffuser. The fluid machine is provided, and it has the diffuser for converting kinetic energy of a fluid into pressure energy. The diffuser has first and second diffuser flow passages configured so that the fluid passes through them, and shapes of the first and second diffuser flow passages are different from each other.

Abstract: A highly efficient mixed flow pump can prevent flow separation which is likely to occur in a corner portion of a flow passage of a diffuser section. The mixed flow pump includes a casing having an axis and defining an impeller section and a diffuser section disposed downstream of the impeller section with stationary diffuser blades protruding from a hub. The diffuser blades are formed so that an angular difference, between a hub blade angle and a casing blade angle, is chosen to conform to a specific distribution pattern along a flow passage of the diffuser section.

Abstract: Disclosed is an impeller for a turbomachine. The impeller comprises a hub, full blades equidistantly disposed on the hub in a circumferential direction, and a splitter blade disposed between each adjacent two of the full blades. The splitter blade is shaped in such a way that a spanwise distribution of a pitchwise position of a leading edge of the splitter blade is determined according to a spanwise and pitchwise non-uniformity distribution of fluid velocity of a fluid flowing into the splitter blade, whereby a non-dimensional circumferential position of a leading edge of the splitter blade varies in a spanwise direction.

Abstract: An impeller in a turbomachinery has blades designed such that reduced static pressure difference .DELTA.Cp between the hub and the shroud on the suction surface of the blade shows a remarkably decreasing tendency near the impeller exit as it approaches the impeller exit between the impeller inlet and the impeller exit.

Abstract: An impeller in a turbomachine has blades designed such that a reduced static pressure difference .DELTA.Cp between a hub and a shroud on a suction surface of a blade has a tendency to remarkably decrease in the vicinity of an impeller exit as it approaches the impeller exit from an inlet.