Design method for inducer with long and short blades of nuclear main pump

Abstract

The invention relates to a design method for an inducer with long and short blades of a nuclear main pump. According to the design method, blades of the inducer are improved as a mode that the long and short blades are spaced on the basis of a common inducer, and the outlets of the long and short blades are positioned in the same interface, so that the characteristics of the long and short blades and the inducer are combined, and a novel inducer capable of improving the speed distribution of a liquid and improving the anti-cavitation capability of the pump can be designed.

Description

Technical field: [0001] The invention relates to an inducer, in particular to an inducer with long and short blades. Background technique: [0002] At present, there are two types of inducers used: one is a cylindrical inducer, and the flow area of ​​the inlet and outlet of the inducer is the same; the other is a conical inducer, and the flow area of ​​the inlet of the inducer is the same. The area is large and the outlet flow area is small. This structure can improve the anti-cavitation ability of the inducer itself, so it is widely used. The main function of the inducer is to improve the anti-cavitation ability of the pump. These two conventional inducers can improve the anti-cavitation ability of the pump to a certain extent, but when the flow rate of the pump is further increased, due to the increase of the flow rate The increase of the outlet velocity of the inducer leads to the decrease of the outlet pressure of the inducer, and when the inlet pressure of the impeller...

AI Technical Summary

Problems solved by technology

The main function of the inducer is to improve the anti-cavitation ability of the pump. These two conventional inducers can improve the anti-cavitation ability of the pump to a certain extent, but when the flow rate of the pump is further increased, due to the increase of the flow rate The increase of the outlet velocity of the inducer leads to the decrease of the outlet pressure of the inducer, and when the inlet pressure of the impeller is too low, cavitation may occur

The cavitation phenomenon of the pump has a great impact on the normal operation of the pump. The main hazards are: 1. Changes in the energy characteristics of the machine: after a certain level, the parameters such as the efficiency, power, and flow of the machine will drop sharply. 2. Cause Noise and vibration, 3 surface damage of wetted parts

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