The impact of medium viscosity on the pump unit is mainly reflected in flow, head, efficiency, shaft power and pump type selection. When designing and selecting a pump unit, it is necessary to fully consider the viscosity characteristics of the medium to ensure that the pump unit can operate efficiently and stably.

although power is an important indicator for measuring the performance of a pump, multiple factors such as actual needs, efficiency, quality and reliability need to be considered when choosing a pump. Therefore, it cannot be simply said that "the greater the power, the better the pump".

Large flow pumps are widely used in electronics, electricity, chemical industry, metallurgy, medicine, food, electroplating, environmental protection, fire protection, municipal administration, water purification, textile printing and dyeing, mining and mineral processing, civil construction and other industries due to their good performance, high efficiency, long life and large flow. In actual operation, the flow of large flow pumps can be infinitely adjusted by various methods. Under normal circumstances, the pump works reasonably under the rated point condition, but sometimes due to some reasons, the pump runs under the small flow condition point, which will cause the following negative effects.

As a key equipment for fluid transportation, pumps are widely used in various fields. However, during the operation of the pump, cavitation often occurs, which not only affects the performance of the pump, but also may cause damage to the pump's flow-through parts and shorten the service life of the pump. Therefore, in-depth research on the cavitation phenomenon of the pump is of great significance to improving the operating efficiency and safety of the pump.

The factors affecting centrifugal pump cavitation are issues that must be considered in the design and use of centrifugal pumps. In recent years, a lot of research has been carried out at home and abroad. However, due to different focuses of research, and most of them are conducted on a certain parameter that affects centrifugal pump cavitation, the research results are scattered and some of the opinions are contradictory. This article analyzes the impact on cavitation from the perspective of fluid physical properties.