An impeller includes a hub and blades extending therefrom. The blades comprise splitter blades interspersed between full blades. First flow stations are defined between pressure sides of the splitter blades and suction sides of their full blades. Second flow stations are defined between suction sides of the splitter blades and pressure sides of their full blades. A diameter of the initial flow stations at significant advantages of the splitter blades and at the heart is less than a diameter of the second stream stations at the top edges of the splitter blades and at the heart. The diameter of the initial flow stations at the top edges of the splitter blades and at the tips is greater than the diameter of the next flow stations at the top edges of the splitter blades and at the tips.
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Impellers might be applied as radial compressors in gas turbine engines. An impeller has a heart and blades disposed therearound. After the impeller rotates about its rotational axis, a secondary flow which includes three-dimensional vortical flowstructures develops in blade passages as a result of turning of this flow and into the non-uniform inlet pressure profiles. While main flow is liable for extracting or supplying energy to the working fluid, the secondary flow, which is transverse to themain flow, acts to reduce energy readily available for transfer into the working fluid. The secondary flow creates flows which go from pressure sides to suction sides of the blades. The secondary flow then contributes to tip leakage flow and to pre-mature flowblockage from the impeller.
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