Multi-stage blade centrifugal wheel

Abstract

The invention discloses a multi-level blade centrifugal wheel which comprises a front cover plate, multiple groups of blades and a hub, wherein the multiple groups of blades comprise first-level blades, second-level blades and short blades; multiple blades of the first-level blades are arranged at the inner circumference on one surface of the hub according to same setting angles; multiple blades of the second-level blades are arranged at the outer circumference according to same setting angles; the first-level blades and the second-level blades are alternatively distributed step by step; and the multiple short blades are distributed among the second-level blades. The centrifugal wheel disclosed by the invention can effectively inhibit flow separation of a pump in a blade passage in operation deviating from design conditions, so that the flow uniformity is improved, and the purpose of reducing the vibration magnitude of the pump is achieved.

Description

technical field [0001] The invention relates to a multi-stage vane centrifugal wheel, which can be used for a high-speed centrifugal pump working in a wide flow range, especially in the field of aerospace propulsion. Background technique [0002] Aerospace vehicles need to work stably on the ground, at high altitudes away from the ground, or in space. The engine has the ability to work under variable conditions, and the propellant pump is required to supply the propellant with a certain pressure and flow rate in a wide range of variable conditions. engine. The flow ratio of the propellant pump reaches more than 30, and the minimum flow boundary is close to zero flow. When designing propellant pumps, in order to ensure the flow capacity of large flow conditions, the design point generally takes the maximum flow condition, or slightly less than the maximum flow condition, and the small flow condition that deviates from the design condition is far away, and the flow in the pum...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the high-speed pumps in the prior art cannot work stably under low inlet pressure and wide range of variable working conditions, a centrifugal wheel with high efficiency and wide stable working range under partial working conditions is provided to reduce the pump's pressure in non-design working conditions. vibration levels for improved reliability

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