Flow induced noise of double-suction pump with staggered impellers
In order to study the influence of impeller staggered arrangement on the internal flow noise in a double-suction pump,four impeller staggered schemes were designed according to blade angle.Under the design condition,the unsteady numerical simulation of the internal flow in the double-suction pump was carried out by using standard k-ε turbulence model.Based on the numerical simula-tion results,the dipole sound source was extracted and the sound field in the double-suction pump was calculated by using the direct acoustic boundary element method.The effects of different impeller stag-gered schemes on pump energy performance,pressure pulsation and internal flow noise were analysed.The results show that the head and efficiency of the double-suction pump with staggered impeller are improved by 3.0％and 5.7％,respectively.With the increase of the staggered angle,the peak value of pressure pulsation decreases gradually,with a maximum decrease of 79.6％.When the staggered angle is half of the impeller wrapping angle,the main frequency of the pressure pulsation in the volute,the flow noise of the dipole sound source and the sound pressure response curve changes from 1 blade passing frequency to 2 blade passing frequency,and the amplitude at the main frequency decreases ob-viously.With the increase of the staggered angle,the range of the high sound pressure areas on the sur-face of the suction chamber,impeller and volute decreases gradually,the maximum sound pressure and the frequency response curve of the sound pressure also decrease gradually,with the maximum reduction of 9.9％and 18.7％,respectively.The research results can provide a theoretical reference for the optimi-zation design and vibration and noise reduction of double-suction pumps.
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