To improve the noise characteristics of centrifugal pumps,a biomimetic blade is designed based on the special structure of shark dorsal fins in this paper.the flow and sound fields of the biomimetic pump and prototype pump under 3 flow conditions are numerically simulated to verify the noise reduction effect of the improved structure.The calculation results show that the biomimetic blades have no significant impact on the external characteristics of the pump.By reducing the turbulence pulsation intensity at the volute tongue,reducing and controlling the scale and distribution range of vortex structures in the flow field,and suppressing the severe pressure pulsation caused by rotor-stator interaction,the combined effect of these factors can reduce the intensity of the noise source inside the centrifugal pump to achieve the goal of noise reduction.The characteristic frequencies of pressure pulsation and sound pressure level for all 3 flow conditions are the blade passing frequency and its low-order multiplier frequency.In both design and high flow conditions,the bionic blade suppresses the pressure pulsation and the total sound pressure level at the volute tongue,and the maximum noise reduction is up to 6.72 dB in design flow conditions.The bionic blade has no suppression effect on its pressure pulsation and total sound pressure level due to the complex internal flow at low flow conditions.
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