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为研究叶轮出口宽度对离心泵流动诱导振动噪声的影响,以一台单级单吸离心泵为研究对象,保持泵体和叶轮其他几何参数不变,将叶轮出口宽度b2从10mm分别改为6,8和12mm.在离心泵闭式实验台上测量了不同出口宽度模型泵在全流量范围内的振动和噪声信号,并对信号进行处理和分析.实验结果表明:模型泵流动诱导的振动对泵体的影响最大,随着叶轮出口宽度的增加,模型泵4个测点的振动强度大致呈先增加后降低的趋势,当b2=8mm时,模型泵的振动强度最大;在不同流量工况下,模型泵噪声信号随叶轮出口宽度的增加其轴频峰值变化规律复杂,b2=10mm的模型泵各工况下噪声信号的轴频峰值相对较小,且在设计工况下达到最小值.
In order to study the influence of outlet width of impeller on vibration induced noise of centrifugal pump, a single-stage single-suction centrifugal pump was taken as the research object. The other geometric parameters of pump body and impeller were kept unchanged. The outlet b2 of impeller was changed from 10mm to 6 , 8 and 12mm respectively.Vibration and noise signals of different outlet width model pumps in the whole flow range were measured on a centrifugal pump closed experiment bench and the signals were processed and analyzed.The experimental results show that the vibration induced by the model pump flow The influence of the pump body is the largest. With the increase of the impeller exit width, the vibration intensity of the model test points increases first and then decreases. When b2 = 8mm, the vibration intensity of the model pump is the highest. Under different flow conditions Under the condition of b2 = 10mm, the axial frequency peak of the noise signal is relatively small and reaches the minimum under the design conditions.