Hydraulic design method of high-cavitation-resistance nuclear main pump impeller and high-cavitation-resistance nuclear main pump impeller

Abstract

The invention provides a hydraulic design method of a high-cavitation-resistance nuclear main pump impeller and the high-cavitation-resistance nuclear main pump impeller. According to the design method, an inlet diameter Dj, an outlet diameter D2 and a blade outlet width b2 are determined by selecting proper rotation speed and proper specific speed so as to improve the flow state and improve cavitation resistance and hydraulic performance of the nuclear main pump impeller. The high-cavitation-resistance nuclear main pump impeller designed through the method can provide high flow in a short time to bring away heat of a reactor core, so that the probability of nuclear accidents is reduced. The high-cavitation-resistance nuclear main pump impeller has excellent hydraulic performance, has high cavitation resistance under coolant loss accidents, and therefore improves operation safety and stability of a nuclear main pump under the coolant loss accidents.

Description

technical field [0001] The invention belongs to the field of fluid machinery design, in particular to a hydraulic design method of a nuclear main pump impeller with high cavitation resistance under a dehydration accident. Background technique [0002] Reactor coolant circulation main pump, referred to as the nuclear main pump, is an important part of the reactor cooling system (referred to as "RCP"), the only rotating equipment in the nuclear island reactor, and an important part of the pressure boundary of the primary circuit, which belongs to nuclear safety Class I equipment. When an earthquake or severe vibration occurs, the pipeline pressure of the reactor cooling system changes, which may cause the rupture of the pipeline, thereby causing a loss of water accident. In the loss of water accident, the fluid in the nuclear main pump changes from single phase to multi-phase. Compared with the single fluid phase, the working performance of the nuclear main pump will be great...

AI Technical Summary

Problems solved by technology

When an earthquake or severe vibration occurs, the pipeline pressure of the reactor cooling system changes, which may cause the rupture of the pipeline, resulting in a loss of water accident

In the loss of water accident, the fluid in the nuclear main pump changes from single phase to multi-phase. Compared with the single fluid phase, the working performance of the nuclear main pump will be greatly reduced under the gas-liquid two-phase, which will further make the nuclear main pump The pump cannot work normally, resulting in a nuclear accident

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