Design method of nuclear main pump impeller

Abstract

The invention relates to a design method of a nuclear main pump impeller. Through controlling main geometric parameters such as the inlet diameter, and the impeller outlet diameter of the impeller, the outlet width of an impeller blade, and selecting appropriate specific speed and rotating speed, a nuclear main pump has relatively high effect under a liquid-phase condition, especially in gas phase and liquid-phase operating conditions, thus reducing the probability of nuclear safety accidents in the operating condition of water loss accidents of the nuclear main pump. The thickness of the front cover plate side of each impeller blade is about 15% smaller than the thickness of the rear cover plate side of each impeller blade, and the thickness of each blade uniformly increases from the front cover plate side to the rear cover plate side in a linear manner. The thickness of the blade gradually increases from an inlet edge to an outlet along a streamline direction, wherein the thickness of the inlet edge is about 35% that of an outlet edge; the number of blades of the impeller is 5; and the rotating speed of the nuclear main pump is above 1750r/min, and the specific speed is within 380-430r/min.

Description

technical field [0001] The invention relates to fluid machinery, in particular to a design method for the impeller of a nuclear main pump under gas-liquid two-phase working conditions. Background technique [0002] The reactor coolant main circulation pump (referred to as "nuclear main pump") is the only high-speed rotating equipment in the primary circuit system of a nuclear power plant, and it is also one of the most critical nuclear power equipment. It is located between the reactor and the steam generator and is mainly used to drive the nuclear island. The internal high temperature, high pressure and strong radiation coolant circulates in the primary circuit, and transfers the heat energy generated by the fission of the reactor core to the steam generator to generate steam, which drives the steam turbine outside the nuclear island to generate electricity. In sudden situations such as earthquakes, violent vibrations, excessive pipeline pressure, etc., the pipeline may rup...

AI Technical Summary

Problems solved by technology

Compared with a single liquid phase, under the condition of vapor-liquid two-phase, the performance of the nuclear main pump head will decrease, and thus cannot provide enough coolant for the reactor core. When the coolant provided to the reactor is not enough, the reactor core’s The temperature will rise, so that the reactor cannot operate normally, and even a nuclear accident will occur

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