Bionics technology on resistance and noise reduction of centrifugal pump

As one of important fluid machinery, pumps play a significant role in modern industry, so as to the high requirement of property and stability. During the actual working condition of centrifugal pumps, the flow fields in the centrifugal pump become more complicated due to the fluid separation, the cavitation and other hydraulic vibrations, which can significantly raise the resistance and reduce the working stability.1,2 In addition, due to the geometric asymmetry of the impeller and the interaction between the impeller and the volute, the pressure and the velocity will be different along the radial direction, so that lead to strong pulsation and noise near the tongue of volute. The induced vibration in the centrifugal pump can bring a series of the relevant breakdown in the machines, even to result in disaster in the chemical plant so it can not only reduce the energy conservation, but also enhance the safety and stability to adapt new technology to reduce the resistance and noise of centrifugal pumps. Some traditional technology, which was firstly applied in the special field, such as the fire fighting system, the urban pollution discharge system, the ships and the underwater weapons etc,3‒6 has been applied to the resistance and noise reduction for the fluid machinery, but it is nowhere near enough.

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